Bexley, London
Structural calculations in Bexley
Structural calculations for a Bexley home start at £295 including VAT. Bexley is plain about what building control wants with a full plans application: key information generally includes structural calculations for steel beams or other structural elements. We prepare that set so it goes in with the drawings.
From £295 (VAT included)
- MCIAT chartered
- £2m PI insured
- LABC Partnered
- Fixed fees, VAT included
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What Bexley building control asks for in structural calculations
On its page for full plans applications, Bexley lists the key information it generally requires and includes, where applicable, structural calculations for steel beams or other structural elements. For a typical home project that can mean a steel beam over a knocked-through wall or a wide rear opening, and the loft floor in a conversion.
A calculation set answers that request in one document. Each member is checked for bending, shear and deflection, and the bearing under it is sized for the load it carries. The surveyor can then compare the beam on the drawings with the beam in the calculation and the schedule, and a mismatch is found before the steel is ordered.
Applying by building notice instead of full plans does not remove the need. It moves the checking to site visits, where an unsupported beam size is expensive to correct.
Local figures for Bexley
| Measure | Value | Period | Source |
|---|---|---|---|
| Full plans application: key information generally required includes, where applicable, structural calculations for steel beams or other structural elements. | structural calculations for steel beams or other structural elements | — | bexley.gov.uk, Full plans application - Building Control, Key information generally required |
| Bexley fees adjusted from 20 April 2026. Loft conversion, all prices excl. VAT (add 20%; regularisation has no VAT): under 10 m2 360 plan / 360 inspection / 720 building notice / 1,008 regularisation; 10-40 m2 440 / 440 / 880 / 1,232; 40-60 m2 520 / 520 / 1,040 / 1,456 (GBP). | 10-40 m2 loft: GBP 880 building notice + VAT | — | bexley.gov.uk, Building Control fees and charges, Loft conversion table |
| Bexley SFRA s6.4.2: habitable basements should not be permitted in Flood Zones 2 or 3; less vulnerable basements need safe escape and site-specific analysis showing groundwater flow is not impeded. Geology: London Clay caps the higher ground; the Chalk is the major aquifer. | no habitable basements in FZ2/3; site-specific groundwater analysis | — | bexley.gov.uk, Bexley Strategic Flood Risk Assessment (Entec, August 2010), s6.4.2 Basements, p.38; groundwater section |
| A demolition methodology and structural survey may be required where demolition in whole or part is proposed, including basement development, facade retention, or works affecting a listed building or conservation area building. Structural engineers' drawings and a method statement must show how stability of retained fabric is ensured during demolition and reconstruction. | structural survey + method statement (incl. basement development) | — | bexley.gov.uk, London Borough of Bexley Planning Application Requirements (reviewed 17 October 2018), p.14, 'Demolition Methodology and Structural Survey' |
| No stand-alone Basement Impact Assessment item exists in this list; basement development is named only as a trigger for the demolition methodology and structural survey. A flood risk assessment is required for all new development including minor development in Flood Zones 2 and 3 or critical drainage areas. | no BIA item; FRA in FZ2/3 | — | bexley.gov.uk, London Borough of Bexley Planning Application Requirements (reviewed 17 October 2018), pp.14, 17-18 |
| Conservation areas | 23 named conservation areas published by the council | — | planning.data.gov.uk |
| Listed building entries | 114 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| AD A para 2C23: max span of a floor supported by a wall, centre to centre of bearing | 6 m | — | gov.uk |
| AD A para 2.1, Section 2C | Section 2C wall-thickness rules cover residential buildings of not more than three storeys | — | gov.uk |
| Building Regulations 2010 reg 11F | Design work must be done by a competent person | — | legislation.gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Building regulations, layer by layer
The Approved Documents that shape most house projects, from structure to the application itself.
- A · Part A: structure
- Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments
- B · Part B: fire safety
- All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604
- C · Part L: insulation
- New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4
- D · Part K: stairs
- 2.0 m clear headroom over stairs
- E · Full plans application
- Building control body must decide a full plans application within 5 weeks, or longer if agreed in writing
Bexley's loft conversion fees
Bexley publishes a table of building control fees for loft conversions by floor area. The row for a loft of ten to forty square metres shows this building notice fee: 10-40 m2 loft: GBP 880 building notice + VAT. Other area bands have their own rows, and regularisation carries no VAT.
Those fees are the council's, paid to the council. Our calculations are separate and priced from £295, which is the figure to plan the structural budget around.
Basements, flood zones and the ground
Bexley's flood risk assessment draws a clear line for basements in the higher flood zones: no habitable basements in FZ2/3; site-specific groundwater analysis. The same assessment describes the ground, with London Clay capping the higher land and the Chalk as the major aquifer, which is why groundwater matters to any deep excavation.
At planning stage, the council's application requirements add this: structural survey + method statement (incl. basement development). Where a stand-alone basement assessment is concerned, the position is: no BIA item; FRA in FZ2/3. We read both before a basement scheme is priced.
Bexley's houses and the work they need
75.3 per cent of Bexley households live in a house, and 68.6 per cent own their home. In a house, rear openings, chimney breast removal and loft conversions are typical jobs that need calculations.
The borough has 23 conservation areas and 114 listed building entries, and Green Belt covers 17 per cent of the council area. The council's Design Guide SPD Part 2: Building Alterations and Extensions guides external alterations, and structural work that changes the outside of a house follows it.
Simple rules and calculated design
The guidance is Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments. It allows simple rules where Section 2C wall-thickness rules cover residential buildings of not more than three storeys, and for a floor carried on a wall the simple rules cover a span up to 6 metres between bearings.
Beyond them the route is calculation, and it is done by a competent person: Design work must be done by a competent person. We check the extra loads from a loft or a new opening against the existing walls.
Price, party walls and where to go next
The fee is £295 with VAT included, fixed after the constraints check. You receive the calculations, a beam and padstone schedule and a layout drawing, checked by a second chartered technologist. Digging near a neighbour needs a notice: Adjacent excavation notice at least 1 month before work: within 3 m and deeper than the neighbour's foundations, or within 6 m and cutting a 45° line from their foundations. See party wall notices.
Our building regulations drawings in Bexley use the calculations directly, and construction drawings in Bexley carry them to site. The borough overview is architectural drawings in Bexley. The same service covers neighbouring Dartford and Bromley, and the national rules are in the structural calculations guide.
What you receive
Related pages
Other services in Bexley
Structural calculations nearby
Questions
Does Bexley ask for structural calculations?
Yes, in effect. For a full plans application it generally requires, where applicable, structural calculations for steel beams or other structural elements.
What is Bexley's rule on basements in flood zones?
The flood risk assessment says: no habitable basements in FZ2/3; site-specific groundwater analysis.
Do I need a structural survey for a basement in Bexley?
The planning requirements list a structural survey and method statement for demolition or basement development. The summary reads: structural survey + method statement (incl. basement development).
How much do structural calculations cost in Bexley?
From £295 including VAT, fixed up front. The council's building control fee is separate.
Sources and dates
- bexley.gov.uk, retrieved
- bexley.gov.uk, retrieved
- bexley.gov.uk, retrieved
- bexley.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- gov.uk, retrieved
- legislation.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- nomisweb.co.uk, retrieved
- planning.data.gov.uk, retrieved
- bexley.gov.uk, retrieved
- legislation.gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- legislation.gov.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
Tell us about your property.
We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.