A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessibility — submitted to LABC or your approved inspector with structural calculations coordinated.
The national Approved Documents, checked by Wandsworth’s building control team or a registered approver. Where the work is a mansard — and the borough’s Datahub set records 2,310 of those — Part B fire escape from the new storey is usually the binding requirement, not Part L.
| Requirement | Standard or period | Source |
|---|---|---|
| External wall, new thermal element | 0.18 W/m²K | Approved Document L, Volume 1 |
| Roof, new thermal element | 0.15 W/m²K | Approved Document L, Volume 1 |
| Windows and doors | 1.4 W/m²K | Approved Document L, Volume 1 |
| Escape from a new storey | protected stair or sprinkler strategy | Approved Document B, Volume 1 |
| Full plans decision | 5 weeks, or 2 months by agreement | Building Regulations 2010, reg 14 |
| Building regulations package | from £840 | our fixed fee |
Sources: Approved Documents L (Volume 1, 2021 edition incorporating the 2023 amendments) and B (Volume 1); the Building Regulations 2010 (as amended), regulation 14; the Datahub row from the Planning London Datahub, retrieved 15 August 2026, comparable within Wandsworth only. Read at 1 September 2026. The package fee is our own published fixed fee.
In Wandsworth — Extensive Victorian terraced streets — the classic London side-return extension opportunity; Edwardian villas around the commons; 1930s semi-detached in Southfields for the most part — a building regulations drawings package is the full measured-survey-to-submission drawing set London Borough of Wandsworth needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.


A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessibility — submitted to LABC or your approved inspector with structural calculations coordinated.
Housing stock in Wandsworth: Extensive Victorian terraced streets — the classic London side-return extension opportunity; Edwardian villas around the commons; 1930s semi-detached in Southfields.
Character: Family-oriented, high side-return extension and loft conversion rates; planning department experienced with Victorian terrace modifications.
Article 4: Article 4 for HMO conversions covering the whole borough.
Plans, sections and elevations at 1:50 with full annotation and material specification.
U-values for walls, roof, floor and glazing; SAP or SBEM where required; compliance statement.
Chartered engineer sign-off on beams, pad foundations, lintels, roof structure.
Escape routes, compartmentation, smoke alarms, fire-rated construction detail.
Soil and vent pipe routes, MVHR coordination, EV charging (Part S).
Full Plans submission to Wandsworth Council Building Control or an approved inspector with inspections coordinated through to completion certificate.

Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Wandsworth postcode district we draw in, the stock that dominates it and the authority that validates a building regulations package there. Wandsworth fees below are the statutory England rates for 2026, not building regulations package estimates.
| Postcode | Area | Dominant stock | What it means for a building regulations package |
|---|---|---|---|
| SW12 | Balham | Victorian and Edwardian terraces | Balham is split at SW12. Either Wandsworth Council or Lambeth Council can determine a building regulations package here, so the SW12 address is checked against both policies maps first. |
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | SW15 covers Putney / Roehampton only; Wandsworth Council handles the building regulations package, and Putney / Roehampton case officers apply the SW15 conservation-area map. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | Tooting / Earlsfield is split at SW17. Either Wandsworth Council or Merton Council can determine a building regulations package here, so the SW17 address is checked against both policies maps first. |
| SW18 | Wandsworth / Earlsfield / Southfields | Victorian villas and terraces | A building regulations package at an SW18 address in Wandsworth / Earlsfield / Southfields is determined by Wandsworth Council under its own Local Plan policies for Wandsworth / Earlsfield / Southfields. |
| SW4 | Clapham | Victorian terraces, Edwardian villas | SW4 straddles a boundary: Clapham addresses fall to Lambeth Council or Wandsworth Council, so confirm which authority validates the building regulations package before submitting SW4 drawings. |
| SW8 | South Lambeth / Nine Elms | Victorian terraces, new-build apartments | A building regulations package in South Lambeth / Nine Elms may land with Lambeth Council or Wandsworth Council — SW8 crosses the boundary, and the SW8 policies map decides it street by street. |
| SW16 | Streatham / Norbury | Edwardian terraces, post-war flats | SW16 straddles a boundary: Streatham / Norbury addresses fall to Lambeth Council or Wandsworth Council or Merton Council or Croydon Council, so confirm which authority validates the building regulations package before submitting SW16 drawings. |
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | A building regulations package in Wimbledon / Colliers Wood may land with Merton Council or Wandsworth Council — SW19 crosses the boundary, and the SW19 policies map decides it street by street. |
Roof pitch, wall build-up and plot depth change every few Wandsworth streets, and each one changes what a building regulations package can achieve at that address.
Wandsworth conservation designations: there are 45 across Wandsworth Council, Tonsley, Magdalen Park, Nightingale Triangle among them. Designation costs a Wandsworth owner the permitted-development route: a building regulations package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Nightingale Triangle is the Wandsworth designation that most often changes a building regulations package design.
What Article 4 removes near Wandsworth: Article 4 for HMO conversions covering the whole borough. Before pricing a building regulations package we check whether the SW11 address is inside the mapped area, because Wandsworth Council draws the Wandsworth boundary street by street rather than across the whole of Wandsworth.
What Wandsworth is built from: Extensive Victorian terraced streets — the classic London side-return extension opportunity; Edwardian villas around the commons; 1930s semi-detached in Southfields. Family-oriented, high side-return extension and loft conversion rates; planning department experienced with Victorian terrace modifications. That mix decides the building regulations package route in Wandsworth more than the postcode does, and it is what a Wandsworth Council case officer reads first. A householder application costs £548 paid to Wandsworth Council direct, with 8 weeks to a decision once validated.
Sources for this Wandsworth building regulations package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
Direct answers to the questions Wandsworth homeowners ask every week about building regulations drawings.
Start a free quote →In Wandsworth, you can submit building regulations applications to either Wandsworth Council's in-house Building Control (LABC route) or to a private approved inspector. Both routes produce the same legally-valid completion certificate. We submit to whichever suits your project and builder.
The building regulations fee for a Wandsworth project is set by scope: a straightforward extension or loft is the baseline, while HMOs, basement conversions and flat splits need more detailing and coordination. Structural calculations are priced by the intervention — a single beam is far less than a full loft or underpinning package. See our fees.
Yes — every habitable loft conversion in Wandsworth (and across England) requires Building Regulations approval covering fire escape, floor structure, insulation and staircase. This is independent of whether you also need planning permission.
Part L of the Building Regulations sets minimum energy-efficiency standards — insulation, glazing U-values, air permeability, heating efficiency. New extensions in Wandsworth must meet the 2025 uplift (Future Homes Standard transition). We include full Part L calculations and a compliance statement in every Complete package.
Once submitted, Wandsworth Council Building Control reviews Full Plans within 5–8 weeks. Approved inspectors typically review in 2–4 weeks. On-site inspections run through the build — typically 6–10 visits depending on scope.
In Wandsworth, building regulations are required for: loft conversions, extensions, structural alterations, roof replacements, new openings in walls, and any work to a flat. Some minor works (like-for-like replacements, small porches) are exempt. We confirm at the free site visit.
A completion certificate from Wandsworth Council Building Control (or an approved inspector) confirms your works comply with Building Regulations. It is essential for selling or re-mortgaging — lenders and conveyancers require it. We manage the inspection sequence and close out sign-off as part of every Complete package.
Extensions and loft conversions in Wandsworth that change the building's energy characteristics require an updated EPC (or SAP/SBEM calculation as part of Part L compliance). We include Part L calculations in every Complete and Bespoke package.

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