Building control

Building Regulations drawings in London.

MCIAT chartered technologists delivering construction-ready building regulations drawings London-wide — Full Plans, Building Notice or Regularisation routes, from £840 fixed fee. Every package covers the full Approved Document suite (Part A structure, Part B fire, Part L thermal, Part M accessibility, Part F ventilation, Part P electrical) with structural calculations coordinated and submission to LABC or your Approved Inspector.

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From £840 fixed fee council-ready drawing review All London boroughs £2m PI insured
Building regulations drawings with construction detail annotations for London property

Quick facts · Building Regulations Drawings in London

Fixed fee from
£840
Typical turnaround
3–4 weeks to submission
What’s included
Construction drawings, Part L, structural, fire, drainage
Coverage
All 33 London boroughs
Approval rate
council-ready drawing review
Team
MCIAT chartered technologists
What's included

Fully end-to-end, nothing extra to add.

Full construction drawings

Plans, sections and elevations at 1:50 with full annotation, material specification and construction detail.

Thermal (Part L) calculations

U-values for walls, roof, floor and glazing; SAP or SBEM where required; compliance statement.

Structural calculations

Chartered engineer sign-off on beams, pad foundations, lintels, roof structure, CDM coordination.

Fire safety (Part B) strategy

Escape routes, compartmentation, smoke alarms, fire-rated construction — critical for flats and HMOs.

Drainage & services layout

Soil and vent pipe routes, MVHR coordination, EV charging provision (Part S).

Building Control submission

Full Plans submission to LABC or approved inspector; inspections coordination through to completion certificate.

Five compliance routes, one decision

Full Plans, Building Notice, Regularisation, Initial Notice or Change of Use — which route fits your project?

Building Regulations approval in London runs through one of five routes. The right choice depends on the scale of work, whether the build is already underway, whether you want the council or an Approved Inspector, and whether you need pre-approved plans before lifting a single brick. Below is the plain-English decision matrix, with typical council fees and our fixed drawing-and-submission fee for each.

Full Plans application

The default route for extensions, loft conversions, structural alterations and anything load-bearing. Drawings, structural calcs and Part L compliance approved before work starts — giving certainty to lender, builder and warranty provider. Council fee typically £400–£900 depending on project value. Best for: rear extensions, lofts, side returns, basements.

drawings from£840

Building Notice

Fast-track route with no pre-approved plans — work can start 48 hours after notice. Inspector signs off on site, stage by stage. Cannot be used for flats, work near a sewer, or anywhere fire-safety drawings would normally be required. Council fee typically £250–£500. Best for: small internal alterations, window replacements, isolated structural beams in a low-risk house.

drawings from£840

Regularisation (retrospective)

Sign-off for unauthorised work already completed — usually triggered by a sale, mortgage application or homebuyer survey. The council inspects what exists, sometimes requires opening-up works, and issues a Regularisation Certificate. Council fee typically £400–£1,200 (uplift on standard Full Plans). Best for: unpermitted extensions, lofts and structural alterations discovered at sale.

drawings from£1,100

Initial Notice (Approved Inspector)

Use a private-sector Approved Inspector instead of the council. Faster decision turnaround, more commercial flexibility, and the same statutory weight as LABC sign-off. We work routinely with London Approved Inspectors and coordinate the Initial Notice lodgement. Inspector fee typically £600–£1,400 depending on scope. Best for: time-pressured projects, complex schemes, developer builds.

drawings from£950

Change of Use compliance

Conversion from office to residential, single dwelling to HMO, or commercial to flats triggers a full Building Regulations review even where no extension is built. Fire strategy (Part B), sound separation (Part E), ventilation (Part F) and accessibility (Part M) all need fresh evidence. Council fee typically £600–£1,800. Best for: HMO conversions, office-to-resi (Class MA), flat splits.

drawings from£1,400
Three to four weeks, five stages

From site survey to completion certificate.

Most London Building Regulations submissions complete in 15–22 working days from instruction. The council or Approved Inspector then takes around 5 weeks on a Full Plans decision; Building Notice work can start 48 hours after lodgement and is signed off stage-by-stage on site. Structural calculations are coordinated in parallel so the construction drawings, engineer’s pack and Part L compliance all land together.

1

Site survey & existing drawings

Days 1–3 — measured survey, photographic record, drainage and existing services, U-value baseline for the existing fabric.

2

Construction drawings & specifications

Days 4–10 — 1:50 plans, sections and elevations with full annotation, material schedule, glazing schedule, drainage layout.

3

Structural calculations

Days 8–14 — chartered engineer sizes steel beams, lintels, pad foundations and roof structure; calculations and details coordinated with the construction drawings.

4

Submission to council or Approved Inspector

Days 15–18 — Full Plans, Building Notice or Initial Notice lodged with LABC or your chosen Approved Inspector, fee paid, RFI responses managed on your behalf.

5

Site inspections & completion certificate

During build — stage inspections (foundations, DPC, drainage, insulation, completion) coordinated; final completion certificate issued for your lender, warranty provider and future sale pack.

Sample drawing set

A real London Building Regs submission, page by page.

Anonymised drawings from a Full Plans Building Regulations submission for a rear extension and internal alterations to a Victorian terrace in SE15. Approved by Southwark LABC at first review, with chartered structural engineer sign-off on a steel goalpost frame and pad foundations, and Part L compliance demonstrated against the 2021 Approved Document update.

Construction detail drawing — anonymised Full Plans Building Regulations sample, London Victorian terrace
Construction details · 1:10 · A3
Annotated Building Regs plan with Part L thermal markup — anonymised London sample
Proposed plan & Part L markup · 1:50 · A3
Section through proposed extension with insulation build-up and steel beam — Building Regulations sample drawing London
Section through extension · 1:20 · A2
Structural setting-out plan with steel goalpost and pad foundations — London Building Regs sample
Structural setting-out · 1:50 · A3

Want the full PDF set? Start a free quote and we’ll email a redacted sample matching your project type.

Fixed fees — 30% below London architects

Building Regulations drawings, priced honestly.

Essentials BR

Building Regulations drawings for a single-storey rear, side return or internal alteration.

from£840
London architect: £1,400–£2,000
  • Measured survey + existing drawings
  • Full construction drawings (1:50 + 1:10 details)
  • Full Plans or Building Notice submission
  • LABC or Approved Inspector lodgement
Start Essentials →
Most popular

Complete BR

BR drawings + structural calculations + SAP / U-value calcs.

from£1,400
London architect: £2,400–£3,400
  • Everything in Essentials
  • Structural calculations (steel, lintel, foundation)
  • SAP / SBEM & U-value calculations
  • Part B fire strategy & Part E sound where applicable
  • Agent service until approval
Start Complete →

Premium BR

BR + structural + SAP + Part L compliance report + site inspections.

from£2,100
Architects: £3,800–£6,500+
  • Everything in Complete
  • Full Part L compliance report (2021 ADL update)
  • Stage site inspections coordination
  • Completion certificate handover pack
Discuss Premium →
Real London Building Regs projects

Recent Building Regulations submissions.

Three featured Building Regulations packages across Greater London. Project references verifiable on each council’s public Building Control portal — full case studies publishing shortly.

Lambeth loft conversion — Full Plans approved, fire strategy resolved

Victorian terrace, SW2. L-shape dormer loft with Part B fire strategy through a three-storey staircase. Full Plans approved by Lambeth LABC at first review with 30-minute fire-rated doors, mains-linked smoke alarms and protected escape route detailed. Chartered structural engineer sized the new ridge beam and floor joist upgrade.

ApprovedCase study soon

Southwark rear extension — BR + structural in 3 weeks for fast-track build

Edwardian terrace, SE15. 4m rear single-storey extension with bi-fold glazing. Full Plans Building Regs and structural calcs delivered in 15 working days to meet a contractor’s booked start. Steel goalpost frame, pad foundations, Part L glazing balance and drainage diversion all coordinated in one submission. Approved without RFIs.

ApprovedCase study soon

Hackney HMO regularisation — retrospective sign-off achieved

Converted Victorian house, E5. Unauthorised flat split discovered during a remortgage survey. Regularisation submission with retrospective fire compartmentation (Part B), sound separation between flats (Part E), MVHR upgrade (Part F) and EICR-compliant electrical evidence (Part P). Regularisation Certificate issued after one round of opening-up works.

ApprovedCase study soon
Building Regulations FAQs

Common questions.

Every case is different. Call +44 7592 201 353 for a five-minute chat.

Start a free quote →
Do I need building regs if I have planning?

Yes — planning and building regs are separate regulatory regimes. Planning governs what you can build (design, use, visual impact); building regs govern how it's built (safety, structure, energy). Almost every extension, loft and conversion needs both.

LABC or approved inspector — which is better?

LABC (Local Authority Building Control) is often cheaper and preferred by smaller builders. Approved inspectors are private and typically faster with more consistent inspectors. We submit to either. Post-Grenfell, LABC is mandatory for high-risk buildings.

When are structural calculations needed?

Whenever you remove or modify load-bearing structure: opening up a wall, cutting a floor for a staircase, extending at ground floor. Our Complete package includes calcs; Essentials doesn't.

What about Part F ventilation and Part O overheating?

Both are included in the compliance package. Part O (overheating, 2022) is particularly relevant for flat conversions and south-facing loft conversions — we model it routinely.

Can you submit retrospectively?

Yes — a Regularisation Certificate application covers work built without building regs. We inspect, draft compliance drawings and apply. Price from £560 plus LABC fees.

See how it works

Watch: Building Regulations in action

See how we produce construction-ready building regulations drawings — Part L thermal, Part B fire, structural calcs.

Video coming soon — subscribe for updates

“
Building control signed off everything first visit. The Part L calcs and structural package were exactly what the inspector needed — no queries, no delays.
D
David M.
Loft conversion · Islington
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council-ready drawing review · All 33 London boroughs