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 architectural technologist team at Architectural Drawings London — CIAT Affiliate, professional indemnity 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: the direction applies across the whole borough to HMO conversions. It does not change the Building Regulations position at all, but it does change whether a conversion needs permission in the first place, so the Article 4 check belongs at the start of the job.
Plans, sections and elevations drawn at 1:50 and fully annotated, with materials and build-ups specified rather than left for the contractor to decide on site.
U-values calculated for every element — wall, roof, floor and glazing — with SAP or SBEM output where the project needs it and a written compliance statement alongside. On this borough's solid-wall Victorian stock that build-up is the hardest part of the package to get right.
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).
A Full Plans submission goes either to Wandsworth Council Building Control or to a private approved inspector, and the inspection sequence is booked and tracked from first visit 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 site survey.
Build costs are separate and quoted by your contractor. See our published fees.
Wandsworth shares more postcodes than it holds outright — SW4, SW8, SW12, SW16 and SW19 all cross a boundary, while SW18 is wholly the borough's. The table gives the stock in each district and the authority validating the planning side of the work there. Fees here are the 2026 rates fixed by regulation.
| Postcode | Area | Dominant stock | What it means for a building regulations package |
|---|---|---|---|
| SW12 | Balham | Victorian and Edwardian terraces | Balham sits across SW12 between Wandsworth and Lambeth. The two apply different Local Plan policies to the same kind of Victorian terrace, so establishing which one governs comes first. |
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | SW15 covers Putney / Roehampton only; Wandsworth Council handles the building regulations package. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | SW17 splits Tooting and Earlsfield between Wandsworth and Merton. Confirm the council before submitting, since each publishes its own validation checklist. |
| SW18 | Wandsworth / Earlsfield / Southfields | Victorian villas and terraces | SW18 is entirely Wandsworth — Wandsworth Town, Earlsfield and Southfields — so one Local Plan and one validation list govern everything submitted from these addresses. |
| SW4 | Clapham | Victorian terraces, Edwardian villas | SW4 divides Clapham between Wandsworth and Lambeth. Building Regulations apply identically on both sides, but the planning route, the fee and the conservation guidance can all differ within a few streets. |
| SW8 | South Lambeth / Nine Elms | Victorian terraces, new-build apartments | Nine Elms and South Lambeth share SW8 between Wandsworth and Lambeth, and the line runs through an area under heavy redevelopment, so we verify the authority against current mapping rather than from memory. |
| SW16 | Streatham / Norbury | Edwardian terraces, post-war flats | SW16 touches four authorities around Streatham and Norbury: Lambeth, Wandsworth, Merton and Croydon. Only the address establishes which of them validates the planning side. Building Control can go to any approved inspector regardless. |
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | SW19 crosses into Merton at Wimbledon and Colliers Wood, so the planning authority depends on the street. The building regulations route is unaffected by that boundary. |
These terraces look uniform and are not. Plot depth, wall construction and the angle of the roof all change within a single street, and each one moves the insulation strategy, the steelwork and the floor area a building regulations package can actually deliver.
45 conservation areas across the borough — Tonsley, Magdalen Park and Nightingale Triangle among them. Designation removes permitted development, so the planning half of the job becomes a full application. The householder application fee in England is £548, with 8 weeks for a decision, where a prior approval would have run 6. The fee for a larger householder prior approval is £249. The Building Regulations requirement does not move either way — it bites inside and outside the boundary alike, which is the part owners most often miss.
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.
Straight answers to what Wandsworth owners ask about building regulations: when approval is actually needed, who to submit to, how long the review takes, and what the completion certificate is for.
Start a free quote →Either route works: the council's own Building Control team, or a private approved inspector. The certificate carries identical legal weight whichever issues it. What actually separates them is turnaround, and whether the inspector can fit your builder's programme — so we submit wherever suits the job in front of us.
The fee follows the scope. A single-storey extension or a loft sits at the baseline; HMO work, basement conversions and flat splits demand more detailing and more coordination. Structural calculations are priced by intervention: one beam through a Victorian spine wall is not the same job as a whole loft, still less an underpinning scheme.
Yes. Building Regulations approval is required for any habitable loft conversion, covering escape, floor structure, insulation and staircase geometry, and that requirement stands whether or not planning permission is also needed. On a pre-1919 terrace the existing floor structure is usually what decides the design.
Part L sets the floor on insulation, glazing performance, air permeability and heating efficiency, and an extension here has to satisfy the 2025 uplift that came in with the Future Homes Standard transition. That is harder in Wandsworth than in an inter-war borough: 43.4% of its 157,890 homes were built before 1919, per VOA CTSOP4.1 dated 31 March 2025, which usually means solid walls and an insulation strategy that eats internal floor area. Part L calculations and a written compliance statement are in every Complete package.
Council Building Control here usually comes back on a Full Plans submission within 5 to 8 weeks. A private approved inspector is more often 2 to 4. Site inspections then run across the build itself, 6 to 10 visits depending on how much structure is involved.
Approval is needed for lofts and extensions, for structural alteration, for a roof replacement, for any new opening formed in a wall, and effectively for anything done to a flat — which matters here, because so much of the Victorian stock has been split into flats. Like-for-like replacement and small porches are generally exempt. We confirm it at the free site visit.
The completion certificate is Wandsworth Council Building Control's, or the approved inspector's, written confirmation that the finished work complies. Conveyancers and lenders ask for it, which is why an unclosed application resurfaces years later at the point of sale. Managing the inspections and closing the file out is part of every Complete package.
Where the work changes how the building performs, an updated EPC comes into it — or, more precisely, the SAP or SBEM calculation that sits behind Part L compliance. Those figures form part of the Complete and Bespoke packages, not an extra line on the invoice.
If your property sits on a boundary, here are the neighbouring options.
One CIAT-affiliated practice takes the Wandsworth work end to end — survey, planning, building regulations and structural calculations — so the Part L figures and the structural scheme are drawn from the same measured set.
Every loft type across every Wandsworth roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...
Wandsworth's most space-efficient loft solution when PD-route dormers are blocked. Our team designs mansards that get approved in ...
Turn your unused Wandsworth garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...
Full architectural technology service for basement digs and cellar conversions in Wandsworth — structural underpinning design, waterproofing...
Chartered structural engineer calculations for every residential intervention in Wandsworth — steel beams, lintels, pad foundations, wall re...
Measured surveys across Wandsworth — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...
End-to-end Party Wall Act 1996 service for Wandsworth — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...
London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Wandsworth property,...
Leave your number and an Architectural technologist will call you back within 30 minutes during working hours.
No obligation. No sales pressure. Just expert advice about building regulations drawings in Wandsworth.
Free quote in 60 seconds. No hourly billing. CIAT Affiliate.
Get my free quote →
