01Verdict up front
Evidence-to-Cash scores 85/100. The strongest reason is that the £149 retrospective pack can be delivered by hand now, while recent FMB records and builder discussions show payment, variation and communication failures with immediate cash consequences. FMB 2025 dispute report · FMB payment webinar
02The idea as understood
Evidence-to-Cash takes an accepted quote, owner-approved voice or text notes, dated photos, the customer instruction and an owner-entered commercial effect. It returns a numbered draft variation, an approval trail and an invoice or payment evidence pack. It must not infer price, entitlement, contract notices, delay claims or legal positions, and it must not send an unapproved message.
The proposed model is £149 for a retrospective pack, £500–£1,000 setup, then £149–£299 per month or £25 per extra pack. Only the £149 retrospective pack is in this test. The recurring proposition remains unvalidated.
Gaps in the brief: INFERENCE: jurisdiction, contract families, project-value limit, pack size, turnaround, retention policy, professional indemnity and identity checks are not fixed. They block scale, but not a bounded manual demand test.
Prior work: the UK Trades & Construction AI Software Market Study 2026 and St Helens assessment were used as INFERENCE for framing only. Their scores did not feed this report.
03Buyer and trigger
Buyer
Owner-manager or working director of a UK residential builder or project trade with 2–20 staff, with authority over commercial records.
Trigger
A progress or final invoice is due, a client queries an extra, or payment is withheld and the owner must reconstruct the record.
Current workaround
Search messages, photos, quotes and notes, then rebuild the account in email, a spreadsheet or a PDF.
Consequence
Work can stop, cash can be delayed and the disagreement can reach mediation or legal action. FMB accepted 430 domestic disputes in 2025.
Sources: FMB dispute report · FMB builder guidance · LegalAdviceUK example
04Evidence log
The sweep stopped at the 15-signal budget. High confidence means page content was confirmed directly. Medium means role, incentives or review provenance limit the inference. All community evidence is within roughly 24 months.
| # | Source and speaker | Behaviour observed | Cost or spend | Date | Confidence |
|---|---|---|---|---|---|
| 1 | FMB dispute service Report | Accepted 430 domestic disputes; frequent causes included unclear terms, payment disagreements and communication breakdowns. | Realised dispute escalation; amount not published. | 2025 | High |
| 2 | FMB SME builders Webinar | Members described unpaid invoices, disputed final payments, paperwork affecting court outcomes and variation documentation. | Cashflow and profitability affected; amounts not published. | 5 Aug 2026 | High |
| 3 | FMB builder guidance Guide | Recommends frequent invoices, written price approval for every variation and regular photo evidence. | Common payment terms of 7–14 days. | Checked 17 Aug 2026 | High |
| 4 | UK government review RPC opinion | Green-rated evidence case for action on late, long and disputed payment, including construction retention practices. | System cost not stated. | 1 Aug 2025 | High |
| 5 | Citizens Advice Complaint data | Consumers are told to keep paperwork, receipts, dated notes and photos. 36,534 home-improvement complaints were recorded. | 4,365 complaints concerned major renovation work; remediation cost not stated. | 11 Aug 2025 | High |
| 6 | AskUK fitter community Thread | Customer challenged extras at invoice time; prior messages supported eventual payment. | £2,800 base job, 6–7 extra hours, one week arguing. | 9 May 2026 | Medium |
| 7 | DIYUK extension client community Thread | Recommended logging communications and payments in a spreadsheet; challenged markup on extras. | £3,500 patio quote before alternative sourcing. | 13 Sep 2025 | Medium |
| 8 | LegalAdviceUK client community Thread | Built a room-by-room spreadsheet comparing original scope, installed electrical points and difference. | About £5,000–£6,000 in dispute. | 7 Apr 2026 | Medium |
| 9 | Quantity surveyors community Thread | A subcontractor threatened to leave, but its variation was described as inflated and unsupported. Peers demanded substantiation. | Amount not published; walk-off risk explicit. | 9 Sep 2025 | Medium |
| 10 | UK Business Forums community Thread | Members discussed payment avoidance but also deposits and milestone billing as prevention. | No software spend; commercial terms are the substitute. | 25 Jul 2025 | High |
| 11 | BuildHub self-builder community Thread | Late retrospective variation prices arrived without proof; replies advised itemisation and contract checks. | Described as disproportionate; amount not published. | 12 Feb 2026 | High |
| 12 | BRCKS Product page | Already captures WhatsApp messages, photos, sign-offs and variations into an invoice-ready record. | £40/core seat annually or £50 monthly. | Checked 17 Aug 2026 | High |
| 13 | Buildxact Pricing | Digital signatures, change orders, job management, invoicing and integrations prove paid category demand. | £119–£349 monthly; £89–£262 annually. | Checked 17 Aug 2026 | High |
| 14 | Tradify Pricing | Photos, communications, acceptance, progress invoicing, reminders and accounting sync. | £34–£44/user/month. | Checked 17 Aug 2026 | High |
| 15 | Capterra reviewers Buildxact reviews | Users report better job and invoice tracking, but some cite setup, restriction or price. Incentivised reviews were discounted. | One intermittent user rated value 2/5. | Mar 2025–Apr 2026 | Medium |
Community voice
Recurring language: extras, in writing, proof, stage payments, spreadsheet, variation and sign-off.
- “text trail saved me”AskUK, 9 May 2026 · thread
- “prove it / substantiate it”r/quantitysurveying, 9 September 2025 · thread
- “The trick is to not let the bills mount up”UK Business Forums, 25 July 2025 · thread
- “without any proof”BuildHub, 12 February 2026 · thread
Objections heard: clients and QSs question whether the item was in the original scope, whether price was agreed beforehand, whether work was defective and whether the record is one-sided.
Communities observed: Reddit AskUK, DIYUK, LegalAdviceUK, quantitysurveying and ConstructionUK; BuildHub; and UK Business Forums. BuildHub publishes 23,833 members, but is client-heavy. Research or promotional construction posts were also found removed from Reddit. BuildHub figures · removed research post
05Kill list
Disconfirming evidence was searched for deliberately.
| Finding against the idea | Seriousness |
|---|---|
| The central software wedge is occupied. BRCKS serves the exact segment through WhatsApp with photos, variations, approvals and invoice-ready records. Source | High |
| Broader systems bundle the workflow. Buildxact, Tradify and PlanRadar already sell overlapping evidence, approval, document and payment features. Buildxact · Tradify · PlanRadar | High |
| A polished pack can amplify a weak claim. QSs and clients dispute whether work was an agreed variation and whether the price is substantiated. QS thread | High |
| Commercial discipline may solve the problem cheaply. Written approval, deposits and stage payments reduce exposure without new software. FMB · UKBF | Medium |
| Open buyer reach is awkward. Exact buyers sit in fragmented or moderated channels, and research or promotional posts were removed from construction subreddits. Example | Medium |
Searches for BRCKS complaints, BRCKS cancelled, failed UK builder variation software, why builders stayed with spreadsheets, and UK variation-app shutdowns returned no independently verifiable recent cancellation or shutdown evidence. This is not proof of incumbent satisfaction.
06Competitor and incumbent map
| Option | Price | Overlap and friction |
|---|---|---|
| BRCKS | £40 annual or £50 monthly per core seat | Exact WhatsApp, variation, photo, approval and invoice-record overlap. It does not raise invoices and has little independent review history. Source |
| Buildxact | £119–£349 monthly; £89–£262 annually | Broader change-order and invoicing suite. Some recent reviewers cite setup, restriction or price. Pricing · Reviews |
| Tradify | £34–£44/user/month | Already stores photos and communications and supports acceptance, progress invoicing and reminders. Source |
| PlanRadar | £23–£139/user/month | Reports, versioning and approval workflows, with more project-system depth than many small firms want. Source |
| Do nothing / spreadsheet | £0 software, plus owner time | Familiar and flexible, but records are rebuilt manually and may be distrusted. Example |
| Evidence-to-Cash | £149 one-off; £149–£299/month later | Unvalidated. It must prove buyers pay for careful retrospective reconstruction when software and process alternatives exist. |
07Score breakdown
| Factor | Weight | Score | Justification |
|---|---|---|---|
| Pain evidence | 25 | 2 | 430 accepted FMB disputes plus fresh cases across several channels. Scored down because ten independent, recent, quantified buyer complaints were not logged. |
| Urgency | 20 | 3 | The event can stop work, hold a current invoice and escalate immediately. |
| Buyer reach | 20 | 2 | Named public communities exist, but the exact owner-manager segment is diluted and promotional access is uncertain. |
| Manual pilot | 20 | 3 | A bounded pack can be delivered this week with secure upload, spreadsheet, document template and email. |
| Price clue | 15 | 3 | Current overlapping products cost £34–£349 per month, establishing real category spend. |
08Proposed test design
Offer
Within two working days, turn one real project’s existing quote, instructions, photos and owner-approved effects into a numbered, source-linked retrospective variation and payment pack. £149.
Commitment action
Pay £149 for one limited pack. Interest, interviews and email sign-ups do not count as strong commitments.
First channel
A rule-checked UK Business Forums post, supported by manual one-to-one outreach to identifiable owner-directors. Distribution remains a human action.
Gate rationale
The default gate is retained because the market is reachable but fragmented. It tests payment, not stated enthusiasm.
A qualified applicant is the owner or authorised commercial decision-maker of a 2–20 staff UK residential builder or project trade, has a real customer-instructed change, and will provide the accepted quote, instruction and dated evidence securely. Stop or refine if 50 qualified visits are reached without both payments.
09Risks and unknowns
- Exact competitive overlap. BRCKS already markets the central flow to the exact buyer. Source
- Entitlement and legal boundary. INFERENCE: a clean pack may be mistaken for contractual validation. Missing, disputed and not-assessed states must be conspicuous.
- Bilateral trust. Client and QS evidence shows formatting is not proof that a change was agreed, priced properly or defect-free.
- Version integrity. INFERENCE: quotes, revised instructions, deleted messages and edited photos can conflict. Immutable source copies and an explicit chain of custody are required.
- Personal data. INFERENCE: photos and messages may contain people, addresses, phone numbers and third-party content. Collection must be minimised and access-controlled.
- WhatsApp assumptions. INFERENCE: buyer-provided exports are not a WhatsApp Business integration. The test must not scrape chats.
- Economics. Research does not establish whether £149 covers careful reconstruction or whether recurring buyers retain.
- Selection bias. Dispute communities over-represent failures.
- The test will not settle contractual entitlement, dispute outcomes, scaled data protection, integration feasibility, recurring retention or software adoption.
10Recommendation and next step
11Decision log
| Date | Decision | Decided by | Reason |
|---|---|---|---|