Chartered structural engineer calculations for every residential intervention in Wandsworth — steel beams, lintels, pad foundations, wall removals, loft floor joists, underpinning. Eurocode-compliant, Building Control-ready.
A rebuilt roof rather than an addition, so the calculations cover new floor loading at 1.5 kN/m², a new roof structure and usually a steel frame at the party walls. Wandsworth’s Datahub set records 2,310 mansard applications at 87% approved.
| Work | Calculations required | Basis |
|---|---|---|
| Mansard roof structure | Yes | Part A, new roof and floor |
| Loft floor to habitable use | Yes | 1.5 kN/m², BS EN 1991-1-1 |
| Steel frame at the party walls | Yes | Part A, plus a party wall award |
| Removing a load-bearing wall below | Yes | beam sizing and padstones |
| Wandsworth mansard applications | 2,310 | 87% approved |
| Full plans decision period | 5 weeks, or 2 months by agreement | reg 14 |
Sources: the Building Regulations 2010 (as amended), Schedule 1 Part A and regulation 14; Approved Document A; BS EN 1991-1-1 with its UK National Annex; the Party Wall etc. Act 1996; the Datahub row from the Planning London Datahub, retrieved 15 August 2026, phrase-matched and comparable within Wandsworth only. Read at 1 September 2026.
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 structural calculations 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.


Chartered structural engineer calculations for every residential intervention in Wandsworth — steel beams, lintels, pad foundations, wall removals, loft floor joists, underpinning. Eurocode-compliant, Building Control-ready.
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.
Steel beam (RSJ) and padstone design for opening up kitchens, knocking through reception rooms or creating open-plan layouts in your Wandsworth property.
Ridge beam, purlin, dormer framing and floor joist upgrade calculations — essential for every habitable loft in Wandsworth.
Pad, strip or trench-fill foundation design based on Wandsworth ground conditions, tree proximity and drain locations.
New window and door openings — steel, concrete or timber lintel specification with bearing calculations.
Sequential underpinning design, reinforced concrete slab and retaining wall calculations for Wandsworth basements.
Every calculation set is signed by a chartered structural engineer (CEng MIStructE or MICE) — accepted by all Building Control bodies.

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 structural calculation package there. Wandsworth fees below are the statutory England rates for 2026, not structural calculation package estimates.
| Postcode | Area | Dominant stock | What it means for a structural calculation package |
|---|---|---|---|
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | Wimbledon / Colliers Wood is split at SW19. Either Merton Council or Wandsworth Council can determine a structural calculation package here, so the SW19 address is checked against both policies maps first. |
| SW11 | Battersea / Clapham Junction | Victorian terraces, mansion blocks | Battersea / Clapham Junction sits wholly inside SW11, so Wandsworth Council validates every structural calculation package submitted from an SW11 address. |
| SW12 | Balham | Victorian and Edwardian terraces | A structural calculation package in Balham may land with Wandsworth Council or Lambeth Council — SW12 crosses the boundary, and the SW12 policies map decides it street by street. |
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | Putney / Roehampton sits wholly inside SW15, so Wandsworth Council validates every structural calculation package submitted from an SW15 address. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | A structural calculation package in Tooting / Earlsfield may land with Wandsworth Council or Merton Council — SW17 crosses the boundary, and the SW17 policies map decides it street by street. |
| SW18 | Wandsworth / Earlsfield / Southfields | Victorian villas and terraces | A structural calculation 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 | Clapham is split at SW4. Either Lambeth Council or Wandsworth Council can determine a structural calculation package here, so the SW4 address is checked against both policies maps first. |
| SW8 | South Lambeth / Nine Elms | Victorian terraces, new-build apartments | South Lambeth / Nine Elms is split at SW8. Either Lambeth Council or Wandsworth Council can determine a structural calculation package here, so the SW8 address is checked against both policies maps first. |
Roof pitch, wall build-up and plot depth change every few Wandsworth streets, and each one changes what a structural calculation package can achieve at that address.
Wandsworth conservation designations: there are 45 across Wandsworth Council, Nightingale Triangle, Wandsworth Common, Clapham Common West among them. Designation costs a Wandsworth owner the permitted-development route: a structural calculation 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 structural calculation package design.
Wandsworth and Article 4: Article 4 for HMO conversions covering the whole borough. A structural calculation package planned at a SW11 address is checked against that direction first; Wandsworth Council publishes the Wandsworth extent, and the SW11 line rarely follows the Wandsworth boundary you would expect.
The building fabric around Wandsworth: 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. A structural calculation package in Wandsworth is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Wandsworth Council.
Sources for this Wandsworth structural calculation 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 structural calculations.
Start a free quote →Structural fees in Wandsworth scale with the intervention: a single beam for a wall removal is the smallest package, a full loft or extension set (ridge beam, purlins, foundations, lintels) is larger, and basements or multi-storey work are quoted individually. Every package includes chartered engineer sign-off. See our fees.
Yes — removing or altering any load-bearing wall in your Wandsworth property requires structural calculations proving the replacement beam and supports can carry the loads. Building Control will not approve the work without chartered engineer-signed calculations. Even partition walls should be checked before removal.
We deliver structural calculations within 1–2 weeks of receiving the architectural drawings and site measurements. For urgent projects in Wandsworth, we offer a fast-track service (3–5 working days) at a small premium.
A structural survey is a condition assessment of the existing building — identifying defects, movement, subsidence. Structural calculations are engineering designs for new work — beams, foundations, loft steelwork. For most Wandsworth extension and loft projects, you need calculations (not a survey). We provide calculations; we can recommend surveyors if a condition survey is needed.
Yes — we offer standalone structural calculations for Wandsworth projects where you already have architectural drawings from another practice. If you need both drawings and structural, our Complete package bundles them at a lower combined price.

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