A chartered structural engineer produces the calculations, covering residential work at any Bexley address — steel beams and lintels, pad foundations, wall removals, the joists of a new loft floor, underpinning. Written to the Eurocodes and ready for Building Control.
Whenever a load path changes, including on work that needs no planning application at all. Bexley issued 882 lawful development certificates in three years, and every permitted development loft among them still needed Part A calculations for building control.
| Work | Calculations required | Planning application |
|---|---|---|
| Removing a load-bearing wall | Yes | usually none needed |
| Forming an opening in a rear wall | Yes | depends on the extension |
| Rear dormer under Class B | Yes | certificate, not permission |
| Loft floor to habitable use | Yes, 1.5 kN/m² | — |
| Bexley certificates issued | 882 | — |
| Full plans decision period | 5 weeks, or 2 months by agreement | — |
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; Bexley figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026. Read at 1 September 2026. A certificate says permission was never needed; it says nothing about the building regulations.
Structural calculations in Bexley, a borough of 1930s semi-detached dominates; Victorian cottages in Bexley Village and Crayford; post-war estates in Thamesmead and Erith, are the full measured-survey-to-submission drawing set London Borough of Bexley 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 Bexley — steel beams, lintels, pad foundations, wall removals, loft floor joists, underpinning. Eurocode-compliant, Building Control-ready.
Housing stock in Bexley: 1930s semi-detached dominates; Victorian cottages in Bexley Village and Crayford; post-war estates in Thamesmead and Erith.
Character: Outer south-east London suburban; very permissive planning environment; strong PD uptake for extensions and loft conversions.
Steel beam and padstone design — for opening a kitchen out, for taking down the wall that divides two reception rooms, or for a fully open-plan ground floor in a Bexley house.
Ridge beam, purlin, dormer framing and joist upgrade calculations — the set every habitable loft in Bexley needs before Building Control will look at it.
Pad, strip or trench-fill foundation design, worked from the ground conditions at the address, any trees standing close by, and the position of the drains. Flood Zone 3 covers 18.42% of Bexley's land on the Environment Agency's undefended mapping, which is what determines whether the application must carry a Flood Risk Assessment — and it shapes what the foundation and the drainage strategy have to demonstrate.
Window and door openings: the lintel specified as steel, as concrete or as timber, and the bearings beneath each end calculated to suit.
Sequential underpinning design, reinforced concrete slabs and retaining wall calculations, for the basements that do get built in Bexley.
A chartered structural engineer signs each set — CEng, MIStructE or MICE — and Building Control bodies rely on that signature when they accept the submission.
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.
Bexley grants most of what it receives and then loses a third of what it refuses. Householder permission was granted on 2,622 of 2,859 decisions taken between April 2023 and March 2026; separately, of 743 planning appeals the Inspectorate determined, 238 were allowed — 32.0%. An allowed-rate at appeal is not an approval rate, because it describes only the refused minority who chose to fight. What it does say is that when Bexley refuses, the reasoning gets beaten about one time in three. Postcode by postcode below: the stock each district holds, and the body validating a structural calculation package for addresses within it. Fees quoted are the 2026 England statutory rates and not what a package costs. Source: MHCLG live planning statistics. Source: Planning Inspectorate appeal decisions
| Postcode | Area | Dominant stock | What it means for a structural calculation package |
|---|---|---|---|
| DA17 | Belvedere | 1930s semi-detached, post-war flats | DA17 is Belvedere. Bexley Council handles the package there and applies whichever conservation-area designations reach the address. |
| DA18 | Erith Marshes | 1930s semi-detached dominates; Victorian cottages in Bexley Village and Crayford; post-war estates in Thamesmead and Erith | Erith Marshes accounts for all of DA18, which puts every package from a DA18 address with Bexley Council. |
| SE2 | Abbey Wood | 1930s semi-detached dominates; Victorian cottages in Bexley Village and Crayford; post-war estates in Thamesmead and Erith | SE2 is split at Abbey Wood. Greenwich Council or Bexley Council may determine the package, so an SE2 address is put against both policies maps before work starts. |
| DA1 | Crayford / Dartford fringe | Victorian terraces, 1930s semi-detached | DA1 covers Crayford / Dartford fringe only; Bexley Council handles the structural calculation package, and Crayford / Dartford fringe case officers apply the DA1 conservation-area map. |
| DA5 | Old Bexley | Georgian villas, Victorian cottages | DA5 is Old Bexley, entirely inside the borough. Bexley Council takes the package, and which conservation-area designation applies depends on the individual address. |
| DA6 | Bexleyheath | 1930s semi-detached | Bexleyheath fills DA6, so a structural calculation package sent from a DA6 address is validated by Bexley Council. |
| DA7 | Bexleyheath / Barnehurst | 1930s semi-detached | DA7 spans Bexleyheath and Barnehurst. Bexley Council determines the package, and which conservation-area designations bite is a question answered address by address. |
| DA8 | Erith | Victorian terraces, post-war estates | A structural calculation package at an DA8 address in Erith is determined by Bexley Council under its own Local Plan policies for Erith. |
Move a few streets in Bexley and you meet a different roof pitch, a different wall build-up, a deeper or a shallower plot — and each of those alters what the calculations have to prove.
Bexley conservation designations: the borough carries 16, among them Welling, Bexley Village and Old Bexley. Designation removes the permitted-development route, so the work needs a householder application at £548, run over 8 weeks, instead of a prior approval at £249 settled inside 42 days. Which designation applies is settled by the address rather than by the postcode district, and we check that before anything is drawn.
No blanket Article 4 over Bexley: Bexley Council has not withdrawn permitted development across Bexley, so a structural calculation package outside a Bexley conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a DA1 owner wants on file.
Bexley housing stock: 1930s semi-detached dominates; Victorian cottages in Bexley Village and Crayford; post-war estates in Thamesmead and Erith. Outer south-east London suburban; very permissive planning environment; strong PD uptake for extensions and loft conversions. Read that before choosing a structural calculation package route in Bexley — construction, not postcode, sets what is achievable. Bexley Council charges £548 for a householder application and has 8 weeks to determine it.
Sources for this Bexley 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 what Bexley homeowners ask us most often about structural calculations.
Start a free quote →The intervention sets the fee. One beam for one wall taken out is the smallest package there is; a whole loft or extension — ridge beam, purlins, foundations and lintels together — is a larger one; basements and multi-storey schemes are quoted individually. Chartered engineer sign-off is inside all of them. See our fees.
Yes. Remove or alter a load-bearing wall and you need calculations proving the replacement beam, and whatever holds it up, will carry the load that wall was carrying, signed by a chartered engineer, or Building Control will not pass the work. Even a wall that looks like a partition deserves the check: 37.0% of Bexley's 101,740 dwellings went up during the 1930s (VOA dwelling ages, 31 March 2025), and in an interwar semi the load path is not always where the room layout suggests.
Turnaround is 1 to 2 weeks from the point at which we hold the architectural drawings and the site dimensions. For a small premium, a fast-track route returns them within 3 to 5 working days — worth taking when a build date is already fixed.
The two answer different questions. A structural survey is a backward look at what stands there already: defects, movement, whether that crack is subsidence or seasonal. Structural calculations are the engineering design for what you are adding: beams, foundations, loft steelwork. Most Bexley extensions and lofts need the calculations and not the survey. We produce the calculations and can point you to a surveyor should a condition report prove to be the thing you were after.
Yes. If another practice has drawn the Bexley scheme already, we will produce the calculations against their drawings as a standalone job. Need both and the Complete package puts drawings and structure together, priced under what the two cost separately.
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