Agentic UK Building Regulations full plans application and Building Control completion certificate chase service for small builders, self-builders, and homeowners undertaking notifiable works (extensions, loft conversions, structural alterations). Replaces the architectural technician or building control agent who charges £500–£1,800 to prepare the full plans submission, respond to Building Control technical queries, and obtain the final completion certificate — a process that delays property sales and mortgage drawdowns when completion certificates are missing.
Why now
No fresh signal batch provided today; justified by the Building Safety Act 2022 secondary legislation coming into force in 2024–25, which tightened Building Control competence requirements and increased the documentation burden on duty holders — a structural regulatory driver increasing the complexity and cost of Building Regulations compliance for small builders.
Commercial value
~500,000 UK building regulation applications are submitted annually; a significant proportion of small residential projects are managed by homeowners or micro-builders without professional agents. Architectural technicians and building control agents charge £500–£1,800 per full plans submission. A £299 application pack service is a clear arbitrage. Budget line: 'architectural technician / building control agent fees'. ACV £350–£600; high transaction volume creates strong TAM for a focused execution.
Go-to-market
Target self-build forums (selfbuildportal.org.uk, r/DIY UK) and small builder trade associations (FMB members). Also approach independent building control bodies (Approved Inspectors) as referral partners — they see every application. Price: £299 full plans pack, £99 completion certificate chase. First 10 customers: post in UK self-build Facebook groups and message homeowners with live planning permissions on planning portal public search.
2-week MVP
Single feature: structured intake form (works type, floor area, structural details, existing drawings upload) → LLM generates the full plans application covering letter, schedule of drawings, and Building Regulations Part checklist (Parts A, B, F, L relevant to the works). Founder manually reviews against the local authority's standard requirements and delivers the submission-ready pack by email within 24 hours. Cut: drawing production, SAP energy calculations, structural calculations, portal submission. Day-1 outcome: homeowner or builder has a complete, correctly structured full plans application pack ready to submit to Building Control.
Agent score
0.60 — Commercial: named professional fee budget line, ~500k annual applications, Building Safety Act increasing complexity — 0.73; capped because drawings production (which we cut) is often the real bottleneck and may limit conversion. Speed: intake form + LLM checklist/letter is a <2-week build; self-build forums are warm, zero-cost acquisition channels — 0.83. Defensibility: Building Regs are public; moat only builds through local authority policy nuance database and completion certificate chase relationships — honest 0.40.
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