01 Before works
EXISTING CONDITIONExisting roof, broken/missing slates, access and measured layout before strip-out.
BUILT FOR THE ROOF, NOT THE BOARDROOM RC27 · PRIVATE FIELD TEST
Every roof.
Accounted for.
One roof, one operator: survey, measure, specify, price, order, programme and hand over — without losing control of the details.
00 / THE ONE-PERSON ROOFING OFFICE
MEASURED / ESTIMATED / UNVERIFIEDFrom first look to final handover.
One guided workflow does the estimating, buying-list preparation, two-tradesman labour planning and project scheduling. The app highlights what it still needs before a quote can be signed off.
ONE PROJECT FREE · THEN £24.99 A MONTHYour first complete customer project is free.
Free download. Start one complete project, then choose £24.99 monthly for further projects. No automatic charge for the free project. Payments are not active in this preview.
Fast pitched estimate · one entry
Input your measured essentials here. The detailed tabs update automatically.
Only use a slope length measured along the roof, not a horizontal drawing dimension. A plan must be calibrated and pitched before calculating quantities.
Roof area—
Quantity estimate—
Site programme—
Budget incl. tax—
Choose the survey route
SAME OUTPUT / TWO ENTRIESSet the job programme
LOCAL TEAM PRODUCTIONWho has confirmed what?
Live project readiness
FAIL-CLOSED REVIEW0/10 critical checks complete
Precision rule: a photograph alone cannot prove roof dimensions. Even scaled drawings need pitch, details and independent site confirmation before claiming final quantities.
Project forecast
TWO TRADESMEN BY DEFAULTOne-click job packs
OFFLINE EXPORTSSupplier enquiry and quote are drafts only. Nothing is sent or ordered. Prices are illustrative until an exact current SKU / delivery quotation is confirmed.
Your two-tradesman job schedule
Sequential working stages with weekdays only; weather reserve and external delivery/approval dependencies shown separately.
| Trade activity | Team days | Man-hours | Scheduled start | Target finish |
|---|
COMING NEXT · BUILT AROUND REAL ROOFERS
Complete portable backups now keep the original drawings, per-face survey photos and before/during/after diary images in one downloadable file. Now includes a separately costed site-variation ledger with approval references and an immutable original estimate. Coming next: daily installer packs and defects/warranty handover.
01 / SITE-SPECIFIC SURVEY
PROVISIONALStart with the site. Not a guess.
The estimator asks the tradesman for the particulars needed to produce a measured order schedule and flags missing legal or technical checks.
International country profile loaded. Your local currency, units, roofing product families and supplier searches update automatically. Exact prices, taxes, product fixing rules and local building standards are NOT automatically verified. Unchecked financial quotations remain on HOLD; photographs and roof measurements remain usable. No GBP conversion or UK price substitution.
Local market setup · country selected
Material types and supplier searches update with the job country. A local product must still be matched to its actual dimensions and fixing design.
Local supplier search is available below. Automated price offers require a separately approved, authenticated partner connection; no paid feed is active in this preview.
Other roof coverings · manufacturer coverage take-off
For asphalt shingles, metal sheets or membranes, calculate a provisional order count from the exact manufacturer's stated effective coverage. This does not substitute slate/tile quantities or create a priced quote.
Enter a verified product coverage and waste factor to calculate quantity.
Currency is localised automatically. Supplier links open country-aware searches; they do not confirm actual prices, local delivery, taxes or code compliance. A licensed and authenticated supplier feed can import SEARCH CANDIDATES only once approved, enabled and within monthly spending caps. Candidate offers are never added to customer quotes automatically. When an authenticated live feed is enabled, selecting a country searches at country level; pressing Find prices may send the entered postal area to that provider, not the street address.
01. Where and what are we roofing?
REQUIRED JOB BRIEF02. Exact product & fixing specification
Clip purchase · active roof face
Apply the checked fixing specification to this roof first. When clips are required for new covering, enter the exact compatible product and current pack price. No clip product or price is assumed.
03. Tradesman's review sign-offs
Specification transfer
Once confirmed, apply the site nail/clip counts and minimum lap to the active roof. Existing measurements remain unchanged.
Fail closed: approximate order quantities can be shown, but are never described as legally compliant or final until product and site constraints are recorded and reviewed.
01 / QUANTITY ENGINE
Roof measurements
All measurements stay on this device. Enter actual dimensions — the photograph alone cannot reliably determine roof size.
METRIC · MM / M
01. Roof geometry
MEASUREDOffsets trim the measured slope into the distance between your chosen setting-out reference lines. Set both to zero if you measured that span directly.
02. Preferred covering
DOUBLE LAPHeadlap is a site-dependent specification. Verify against the slate manufacturer, pitch, exposure and the current applicable roofing standard before fixing.
03. Ordering allowance
LIVE SET-OUTVALID MEASUREMENTS
Course intervals
20across set-outSet-out gauge200.0 mm
Setting-out lines21
Field slate pieces490
Order estimate525
Actual headlap100.0 mm
Roof area24.00 m²
Course layout preview
PLAN / NOT TO SCALE Staggered joints Course spacing
Designed for professional checking. Quantities are estimated field pieces for uniform, rectangular, double-lap slating. Cut optimisation, eaves, ridge, hips, valleys, openings, random widths and special details need a separate take-off or allowance.
02 / PRECISION COURSE SETTER
Set once. Strike every line.
Course gauge and set-out summary for the measured roof. No over-gauge final course.
EAVES TURNER COURSES & FIELD GAUGE
03 / ASSISTED PHOTO SURVEY
MANUAL ASSISTED · NO AI CLAIMSSee it. Mark it. Report it.
Map a measured slate grid onto a photo. Tap individual positions to mark what needs replacing or checking.
Photo slate / tile countMANUALLY COUNTED · GRID ESTIMATE
Counted in this photo0Slates / tiles
Whole-face grid estimate—Not image recognition
Upload a roof photo, then tap each visible slate or tile to count. The grid estimate needs measurements and four calibrated corners.
Demonstration roof below. Upload your own photograph to begin an on-site survey.
05 / ROOF PHOTOGRAPHS & FINDINGS
REVIEW FINDINGS BEFORE QUOTINGAdd your roof photos
Take a photo or choose pictures from your phone. They all stay together in this job.
Add more whenever you need. No customer details or roof-section setup needed. Only photographs you select are added; nothing is uploaded automatically.
Your selected photos will be added to this job.
Checking local photo-draft recovery…
Camera unavailable or permission denied? Choose from phone, or enter the work manually. Your phone may offer its photo picker instead of a camera. Cancel leaves this job unchanged.
01 Photo02 Review03 Price04 Report
The historical colour checker is NOT defect AI. The separate Vision AI scan uses a server-side image-capable model, only after you tap the button and only when a secure service is configured. It may be wrong: every proposed fault requires tradesman review. Automatic AI results are review-only until verified by a roofer; approved quantities flow directly into the editable quotation options below.
Advanced tools · photo quality, measurements and old diagnostics
Upload a photograph to start. Nothing is sent to a server.
AI screening is optional and may be unavailable. Continue to Confirm work to mark visible defects manually. No AI result is assumed, and nothing is uploaded without your separate permission and request.
Photo suitability not checked. This check evaluates basic pixel information, not roof defects.
Job photos
ONE PROPERTY / MANY PHOTOSOverview and close-up pictures belong to one job and one quotation. Roof-section assignment is optional for a quick repair. Check overlapping views so the same repair is charged once.
Photo organisation & measured survey
No job photographs imported yet.
Repair quantities come from the work you confirm. Whole-roof measurements are needed only for work priced by roof area. Original photos may contain location metadata; obtain consent and protect your complete backup.
Whole-job roof inspection
ALL ROOF FACESInspect each roof face separately; a photo is required for every quoted defect.
Private verification build: Historical colour alerts remain isolated from the model. Real model suggestions appear only after an explicit scan and are never billable until a roofer inspects, corrects and signs off. The 17 expert-labelled photographs are reference answers for assessment, not model-generated detections. This is not yet a validated production AI service.
Roof image & defect positions
TAP PHOTO TO MARKUnverified review marks0
Tradesman signed-off marks0
Measured grid estimate—
Measured piece counts require a site dimension and calibrated four-corner overlay in Photo Survey. A grid estimate is not image recognition.
Defect review
AWAITING PHOTOThe new AI returns possible defect types and boxes, but cannot sign off repairs. Correct each candidate, write what you see and confirm on site before a quote. Historical colour markers are not diagnoses.
No inspection findings yet.
Check the photo-draft save status before closing. Use Save COMPLETE job + photos for a separate portable backup; a browser can clear local storage.
Repair quote builder
VERIFIED FINDINGS ONLYConfirm defects and enter rates to prepare a draft.
Roof health & storm report
CLAIMS ARE NOT VERIFIEDStorm mode documents photographed conditions and dates only. A photo does not establish causation, insurance acceptance, hidden deterioration or structural safety.
PHOTO → CONFIRM WORK → REVIEW & SHARE
TRADE-REVIEWED ESTIMATESReview the work this roof needs.
Your quotation uses the photo-linked work you confirm, relevant measurements and reviewed prices. No AI suggestion is charged until verified. All offers are provisional.
Upload a roof photograph and confirm the survey to calculate draft options.
Recommended maintenance · add separately inspected work
This is not a random upsell. Give the exact additional work, quantity and rate. All rates are editable and none are retrieved live.
Complete replacement · survey and specification checks
Complete replacement uses the same measured roof faces as Cost Studio, with strip, membrane, battens, covering and finishes. It will not assume roof size from pixels or price unseen decking.
Share quote opens the available destinations for this reviewed customer PDF, including email where supported. Choose and confirm the recipient there. Opening or closing the share menu does not confirm delivery. If sharing is unavailable, save the PDF and attach it yourself.
Photo-to-Quote is OFF until sufficient trade-reviewed inputs exist. No payments, merchant feeds or API calls are made by this calculator.
Any unseen decay, concealed membrane/batten condition, access restrictions, statutory requirements and supplier costs need confirmation. This is a professional estimating assistant, not an automatically issued or accepted contract.
Before / during / after evidence
SIDE-BY-SIDE · NOT PIXEL-REGISTEREDAttach before photo
Attach during photo
Attach after photo
Original timestamps and weather assertions are not independently verified. This view compares separate photos, not identical camera positions. All diary photos are also available in Project diary.
04 / PROFESSIONAL PLAN TAKE-OFF
MEASUREMENT-ASSISTED · VERIFY SCALEPlans to measured quantities.
Upload a roof plan image. Set one known dimension, trace actual roof-face boundaries, and turn scaled plan areas into pitched surface quantities.
For accurate quantities, use a true top-down plan and calibrate from a printed dimension. Architect PDFs: use Open architect PDF (internet required for the initial on-device decoder), choose the page and then calibrate a printed dimension. Original PDFs and rendered page images stay in the same project. Save to account uploads them only with your permission; COMPLETE backups retain both. Offline alternative: export the page as PNG/JPG. Saved traces only price with the matching page image.
PDF awaiting selection.
Read text from this PDF page
Embedded text only, read locally. Reading order, symbols and dimensions may be incomplete. Check the drawing, page, revision and units before entering any measurement. This does not identify roof faces, confirm scale or approve a quotation. Scanned pages require manual entry.
05 / PREMIUM DESIGN PREVIEW
VISUAL CONCEPT · NOT CAD / PHOTOREALSee the roof before you price it.
Interactive roof-cover concept using your selected material, colour and measured layout. Switch to plan-based view after tracing a plan.
Realistic design, honest accuracy: This preview uses a measured roof envelope and selected slate/tile finish. Roof structures, flashings, gutters, dormers, ridge construction and material weathering are only conceptual unless physically surveyed. Uploaded plans remain on your device.
07 / CUSTOMER DESIGN STUDIO
VISUAL CHOICE ≠ ENGINEERING APPROVALA finish the customer can approve.
Capture a client's choices, transfer them to the actual roof section, and preserve a traceable selection schedule for installation.
Customer's preferred specification
DESIGN BRIEFTransfer updates the proposed covering and ridge/hip selections. A change in product invalidates the previous site-specific product and fixing sign-offs.
Client selection schedule
INSTALLER HANDOVERSelection checks
Choose a product and transfer into the measured roof specification. Site, manufacturer, leadwork, weight and heritage approval remain mandatory.
06 / COMMERCIAL QUANTITY + PRICE ENGINE
PRICE BOOK · EDITABLE / NOT LIVEMaterials & cost breakdown
Select re-sarking, re-battening, slate/tile covering and finishing stages. Every selected layer contributes its own quantities and labour. Review all rates before quoting.
EXECUTIVE / SELECTABLE LOCAL CURRENCY PER m² OR ft²
SITE-SPECIFIC · PROVISIONALPrice the exact roofing work — no hidden extras.
Re-sarking, re-battening, slate/tile re-covering or a full re-roof. Select only the work you are actually doing; labour time and materials follow the selection.
Measured inputs & labour output
EDIT FOR YOUR TEAM AND ACTUAL MATERIALSSarking board, sarking fastener and batten fastener prices are editable in the material price book below. Enter the exact stock board dimensions to estimate purchase pieces. All default prices and productivity rates are illustrative, not live local prices.
Selected work-package cost / m²—
Cost / ft²—
Materials / m²—
Labour / m²—
Itemised selected-work purchase list
Two-person work sequence
Building, fire, wind, snow, energy, heritage and permitted roof systems depend on country, region and locality. Country profiles are starting points only, not statutory approval. Confirm the actual roof covering and manufacturer fixing specification before final issue.
MATERIALS / PRODUCT FINDER
REFERENCE LIST · OCT 2026Choose roofing materials for this quote
Search actual UK listings and common roofing work items. Stock and prices are not live. Click a product, confirm its price and add it to the selected job.
Measured lead, valley and flashing stock
Use verified dimensions and joint design. Longitudinal cuts are packed conservatively, with no transverse offcut reuse. Extra-stock percentage rounds up to whole units.
Enter the measured detail.
Select material
Materials selected for this quote
NOT YET ADDEDNo additional products picked yet. Main roofing quantities continue to come from your measured estimate above.
Products in the source list are examples, not checked live prices, inventory, delivery or regulatory approvals. Choosing a roof slate/tile updates the active roof face. Replacement membrane, battens, sarking and ridge materials remove their old material allowance from the selected work package. Other products add a new line; review generic sundries allowances for overlap. Labour, overhead, contingency and your selected VAT are then recalculated.
EXECUTIVE / THE SAME ROOF, DIFFERENT SCOPES
ILLUSTRATIVE · VERIFY QUOTESCompare each roofing option instantly.
Each row is an alternative job price, not an extra charge. All calculations use the same measured roof, chosen covering, labour rates and price book.
Checking roof quantities and site information…
| Work package | Currency / m² | Currency / ft² | Materials | Crew days | Job total | Apply |
|---|---|---|---|---|---|---|
| Enter verified dimensions to compare scope prices. | ||||||
Alternative scope prices exclude the materials picked in the product finder until that scope is applied; only the main job quote includes them. Prices include the entered labour rate, selected access costs, overhead, contingency and VAT. Estimates are not merchant quotes. The re-sarking and re-battening rows are partial work packages, not a complete weatherproof roof. Set out, board specification, fixing design, building control and insulation require site-specific review.
UNVERIFIED PRICE BOOK
Ridge, hip and fixing quantities
ACTUAL LENGTHSCrew size, working hours and site difficulty
Price structure
Materials carry a fixed 20% markup on purchase cost. Additional job profit, if entered, uses direct costs plus overhead and contingency; it is separate from the materials markup. Scaffolding is excluded and arranged separately. Labour uses productive person-hours; half-day booking rounds the schedule only. Setup days are whole-crew days.
The chosen VAT rate is not legal advice. Confirm project-specific tax treatment, fixing specification and installation method.
ESTIMATED TOTAL PROJECT COST
£0.00
Two-tradesman working time—combined working days
Labour cost—workers × hours × hourly rate
This is a costed estimate, not a guaranteed fixed-price quotation. Use supplier-confirmed prices, drawings, access review and site checks before tender.
Purchase quantities
Material price book
Guide rates, not a live supplier feed. Change each price using current merchant quotations.
Guideline price book preloaded · not verified with supplier today.
UK supplier examples are shown for UK projects only. For international jobs, local supplier searches appear under Site Setup and Suppliers. All prices need current evidence.
09 / SOURCING & DAILY KNOWLEDGE REVIEW
RATES UNVERIFIEDPrice locally. Record the evidence.
Use the job postcode and exact product to locate merchants; capture real delivered quotations with source and date. The app checks every day for stale information.
Find suppliers for this job
Results open a live external merchant/maps search. Distance, stock and nearest ranking require map/provider confirmation; nothing is silently assumed.
Capture verified merchant quotation
Daily review queue
EVIDENCE-LEDOffline: the app can track dated prices and prompt a fresh check each day, but cannot refresh supplier prices or standards automatically without a licensed live feed/backend. It never fabricates changes.
Recorded supplier evidence
Delivered quotation comparison
THIS JOB · EX VATCompare the selected item and this roof's required quantity. Purchase unit, exact product and source date must match. Delivery is included in the comparison, not silently added to the job quote.
Learn from completed jobs
Record actual two-person productivity on finished jobs. Future labour forecasts can adopt the observed median only with explicit approval.
10 / SUBSCRIBER PROJECT DIARY & QUALITY REVIEW
PRIVATE BY DEFAULTBefore. During. After. Verified.
Document the real job, compare estimate against measured results, and optionally prepare an anonymised case for improving future estimates. Built for roofers and subscriber teams.
02 During works
HIDDEN WORKSBattens, underlay, fixing specification, gauge set-out and progress checks.
03 After works
FINISHED CONDITIONFinished roof, ridge/hip details, snagging and client handover record.
Compare predicted against installed
HUMAN-VERIFIED LABELSOnly enter counts confirmed on site for the same roof section and scope; do not use guessed photo counts as ground truth.
Quality loop
NO SILENT MODEL CHANGESUploads do not automatically retrain, certify or change the estimator. Verified and permissioned cases are reviewed, tested on held-out roof examples and only then considered for future releases. Calculations remain deterministic.
No remote uploads have been enabled; exported cases remain under your control.
Before / after comparison
SIDE BY SIDEUpload a before photograph
Upload an after photograph
Images are shown as separate photographs; they are not spatially registered. No false before/after pixel-accuracy claims.
11 / DELIVERY CONTROL
SCENARIO · NOT GUARANTEEDA programme the crew can use.
Turn the estimated two-person workload into a staged site sequence, with material lead times, pre-start conditions and weather reserve shown separately.
Start and dependencies
NO FALSE PROMISESWorking days exclude weekends in dated view. Enter public holidays, permit restrictions and subcontractor availability separately. The programme is an editable first pass for qualified review.
Dependencies: Record verified site access, manufacturer fixing specification, drawings, material delivery and required consents before committing a start or completion date.
FORECAST JOB COMPLETION
Set a proposed date
Crew installation time—site working days
Including reserve—not including procurement lead
Sequence and crew allocation
| Work package | Two-person days | First day | Last day | Dates where provided |
|---|
Working days and prices are scenario forecasts, not promises. Special details, weather, discovery work, permits and other trades change the critical path.
14 / ONE MONTHLY MEMBERSHIP
PRICING APPROVED · PAYMENTS NOT ACTIVEEverything. One fixed monthly price.
SLATEFIELD Professional combines roof surveys, measurement, materials, project pricing, and Roof Scan in one package — not a charge for each job.
SLATEFIELD / PROFESSIONAL
No credits. No per-report fees. No annual contract.
Your free project includes multiple roof faces, photographs, calculations, quotations, later edits and exports. A subscription covers further projects. Roof Scan's photographic irregularity suggestions must be confirmed by a tradesman. Cloud-powered AI remains unavailable in this preview; its launch allowance and acceptance are still pending.
After your free project£24.99per month · cancel anytime
ALL INCLUDEDMeasure & estimate
Multiple roof faces, first courses and gauge schedules, natural slate and tile quantities, material and labour calculations, editable costs, quotations and PDF exports.
Based on your measurements and confirmed product specifications.ALL INCLUDEDRoof Scan & photo records
Upload a roof photo, mark suspected missing/slipped coverings, review counts, log repair quantities and export evidence and storm-damage inspection records.
Experimental image detection, not certified defect diagnosis.ALL INCLUDEDRun the complete job
Material pickers, price comparisons, programme, work diaries, variation records, before/during/after photographs and a complete project backup.
Live merchant prices and future AI services require verified integrations.How the subscription works
SIMPLE MONTHLY BILLINGFirst complete customer projectFree · one per account
Monthly subscription£24.99 / month
Standard calculations, estimates and PDF reportsNo per-job fee
CommitmentMonthly · cancel anytime
The actual payment screen must show applicable taxes, payment date, renewal and cancellation conditions before purchase. Subscription access is tied to a verified customer identity, not merely a successful redirect. Pricing in overseas Apple storefronts may vary.
Account and membership status
TEST BUILDLAUNCH CONFIGURATION SAVED£24.99 / month
One complete project free per account. Further projects require an optional £24.99 monthly Apple subscription. This preview cannot charge you.
Sign in to check your free project allowance.
Claim the project you have open. All its roof faces, photographs, quotation options, revisions and later edits stay together. Deleting a job does not reset this allowance. Sign in to the same SLATEFIELD account to recover it; Restore Purchases restores eligible Apple subscriptions.
Private field test. All existing tools remain available without payment in this preview. Live photo storage, App Store purchase/restore and physical iPhone acceptance are pending. This button cannot charge anyone.
Fair use & professional responsibility
One monthly fee covers standard calculations, saved projects, edits and repeated exports. Any future server-powered AI photo analysis will be subject to a disclosed fair-use allowance to keep the price sustainable — never undisclosed extra charges. SLATEFIELD does not certify roof condition, hidden defects, manufacturer compliance or live merchant availability. The tradesman confirms dimensions, material selection, safety checks and every estimate before issuing it. Subscribers must be able to cancel and restore eligible purchases.
15 / WE LISTEN · CUSTOMER CARE
SUPPORT / CUSTOMER SERVICESupport & feedback.
Tell us what works, suggest an improvement, or raise a complaint. Clear messages, an actual delivery status, and an easy way to follow up.
Write to SLATEFIELD
FEEDBACK · IDEA · COMPLAINTChecking support availability…
Your job photos, roof measurements and customer records are never attached automatically. A saved draft stays only on this device. Opening an email draft does not send it; press Send in your email app yourself. Don't email card details, passwords or personal information about clients.
My support requests
Secure ticket tracking will appear here when membership accounts and the dedicated support database are live. No ticket is submitted by the field-test form alone.
Need help without a subscription? Billing, access and complaints must remain reachable even after membership cancellation. Use the support email option while the secure ticket service is in prelaunch. Email opens your mail app; review and send your message there.
04 / MATERIALS & JOB FILE
Your job, properly documented.
Combine roof faces, estimate materials, document repairs and produce a printable handover.
Job information
STORED ON DEVICEThe Cost Studio adds nails, battens, underlay, ridge/hips, zinc, overhead, labour, disposal, VAT and contingencies. Each roof face retains its own slate/tile price when you switch between elevations. Rates are editable illustrations until checked with a merchant.
Your files
Open a .slatefield job backup here. Test reports, inspection exports and PDFs are not saved jobs. Choose Save COMPLETE job + photos to keep your plan drawing, roof-survey images and before/during/after photos alongside measurements. The portable backup stays on your device; it may contain customer details. Keep it secure. Max 18 MB original images per backup. The lightweight JSON does NOT include images.
Recovery copy on this device
Save one complete job with original photographs, up to 180 MB. This private browser copy can be cleared by the browser or device; keep an exported backup too. Saving does not upload or sync it. Restore requires an online check of the same signed-in account.
Checking device recovery availability…
Private account · saved jobs
Optional private preview storage. Sign in and choose Save to account to upload this job. COMPLETE local backups remain independent. Originals upload once; changes save as versioned job data. No AI scan is triggered.
Local mode. Nothing uploaded to an account.
Delete my account
Sign in to review account deletion availability.
Deletion is permanent. Application data is cleared before the login; abandoned uploads are included. Provider backup retention and files you downloaded or already shared are separate.
Preview privacy, retention and limits · 20 jobs / 250 MB per account. No automatic paid upgrade.
WHOLE JOBMULTI-ROOF TAKE-OFF
Roof face breakdown
| Roof face | m² | Intervals | Field pieces | Order est. |
|---|
Professional review required. Values are guidance from user-entered dimensions and geometry. Do not treat a photograph as an independent measurement. Confirm special course counts, slate condition, reusability, compliance, access and quantities on site.
Roof Scan · verified visible defects & separate repair allowance
Open Roof Scan to record visible defects and create a draft.
A photographic finding is not a substitute for roof access, soundness checks or client approval. Roof Scan repair allowances do not modify the original quote.
Before / during / after site notes
Private site notes above stay in your saved job and are excluded from customer reports.
Notes are user-entered, retained in saved job files, and not independently verified.
LIVE SITE CHANGE CONTROL / ORIGINAL PRICE STAYS INTACT
TRACEABLE / OWNER ENTEREDUnforeseen works & variations
Found rotten timbers, extra re-sarking or leadwork? Cost and document it separately. New items stay DRAFT until you record a customer approval reference. The base quote is never silently altered.
Variation pricing freezes the wage rate, overhead, contingency and selected VAT when entered, so later changes to the original job do not rewrite approved amounts. Approval references are user-entered and not independently verified. Time extensions are indicative and are not automatically added to promised completion dates. Check all works, prices, VAT treatment and customer permission before carrying out extras.