Kensington and Chelsea, London
Structural engineering in Kensington and Chelsea
In Kensington and Chelsea the structural engineer is part of the planning application, because the Basements SPD asks for a signed construction method statement and an advanced engineering design before the council will decide. Fixed quote after a free constraints check. We prepare that design alongside your drawings.
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How we work on structural engineering
Four steps from first call to approval.
Enquiry and constraints check
We check the property against conservation areas, listed status, Article 4 directions, tree preservation orders, flood zone and planning history. We choose the right route and send a fixed quote.
Measured survey
We survey the house on one datum: rooms, levels, boundaries, drains, trees and the neighbours' windows that the 45° and 25° tests depend on.
Building regulations
Technical drawings are coordinated with the structural engineer's calculations, the drainage and the planning conditions.
Approval and hand-over
Building control approval, then a next-steps pack covering the commencement notice, party wall timing and CIL.
Free redraws until approval. Every drawing set is checked independently, and the checker is never the person who drew it.
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What the Basements SPD asks the engineer to prove
Local Plan policy sets the aim and the Basements SPD sets the paperwork. The aim is to safeguard the stability of the house, its neighbours and infrastructure such as Underground tunnels and the highway. The paperwork starts with a construction method statement and a draft traffic plan, which the council records as CMS + draft CTMP.
The statement must be signed by a chartered civil or structural engineer, and the borough sets the level of design needed at application: Signed MICE/MIStructE; RIBA Stage D. A second line repeats the standard for the drawings themselves, with the council noting engineering design to RIBA Stage D equivalent at application. That is far more developed than most councils expect, and it is the reason a basement design in this borough cannot be finished after consent.
The ground has to be investigated too. The SPD lists Boreholes; groundwater monitoring; trial pits as the minimum, with boreholes taken deeper where underpinning sits in gravel. Neighbouring houses are protected by a damage test, which the council expresses as damage limit: Category 1, never above Category 2 (CIRIA C580).
Local figures for Kensington and Chelsea
| Measure | Value | Period | Source |
|---|---|---|---|
| Policy CD11 M: designed to safeguard structural stability of the existing building, nearby buildings and infrastructure including London Underground tunnels and the highway. Para 6.113: a Construction Method Statement by a qualified civil or structural engineer, with ground and hydrological report, temporary works and propping, accompanies the application, plus a draft Construction Traffic Management Plan. | CMS + draft CTMP | — | rbkc.gov.uk, RBKC Local Plan 2024 (adopted July 2024), Policy CD11 M (p.253); para 6.113 (p.259) |
| Basements SPD: the CMS must be signed by a Chartered Civil Engineer (MICE) or Chartered Structural Engineer (MI Struct E), include a non-technical executive summary and a statement concluding compliance with the structural stability criterion; engineering design is to be advanced to RIBA Stage D equivalent with drawings covering groundwater, drainage, SuDS, flooding, loads, movements, underpinning and piling; the Council may consult an independent engineer at the applicant's expense. | Signed MICE/MIStructE; RIBA Stage D | — | rbkc.gov.uk, RBKC Basements Supplementary Planning Document (April 2016), Section 5, paras 5.1-5.3 (p.22); para 5.13 (p.27); Figure 4 (pp.23-24) |
| Basements SPD CMS site investigation: boreholes on site (to London Clay where underpinning in gravel; piling depth plus 4 to 5 m), groundwater monitoring where the Upper Aquifer is present, trial pits on all walls to be underpinned or piled, and an assessment of predicted ground movements and damage category for surrounding buildings. | Boreholes; groundwater monitoring; trial pits | — | rbkc.gov.uk, RBKC Basements Supplementary Planning Document (April 2016), paras 5.5-5.11 (pp.25-26); Figure 4 (p.23) |
| CMS contents (para 5.14): desk study and site investigation with engineering interpretation; appraisal of the existing structure and the adjoining buildings and listed walls, with history of movements; groundwater, surface water and flood statements; the likely construction sequence, temporary propping and relationship between permanent and temporary works; trees and root protection. Design and construction should limit damage to the existing and adjoining buildings to Category 1 (very slight, up to 1 mm) of CIRIA C580 Table 2.5 and never worse than Category 2 (slight, up to 5 mm). | damage limit: Category 1, never above Category 2 (CIRIA C580) | — | rbkc.gov.uk, RBKC Basements Supplementary Planning Document (April 2016), Para 5.14 (a)-(k), printed pp.28-29 (PDF pp.30-31) |
| Engineering design for the planning application should be advanced to the equivalent of RIBA Stage D, with drawings addressing groundwater, drainage, SuDS, flooding, vertical and lateral loads, movements, ground conditions, trees, infrastructure, vaults, existing structures, adjoining buildings, overall stability (permanent and temporary works), underpinning and piling. | engineering design to RIBA Stage D equivalent at application | — | rbkc.gov.uk, RBKC Basements Supplementary Planning Document (April 2016), Para 5.13 (a)-(q), printed p.27 (PDF p.29) |
| Additional CMS requirements for listed buildings (para 5.15): assess historic and ongoing movements; detail any historic fabric to be removed with record details of the existing structure; assess the structural impact on the listed building. Excavation beneath a listed building is prevented; a garden basement should be structurally separated (1.5 to 2.0 m for a stiff propped contiguous or secant piled wall; possibly 5.0 m or more for an open excavation), with links limited to the necessary underpinning. | listed buildings: movement history + structural impact; 1.5-2.0 m separation (piled) | — | rbkc.gov.uk, RBKC Basements Supplementary Planning Document (April 2016), Paras 5.15-5.23, printed pp.30-31 (PDF pp.32-33) |
| Listed building entries | 1,350 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Conservation areas | 39 named conservation areas published by the council | — | planning.data.gov.uk |
| Households living in a house | 17 % of households living in a house or bungalow (detached, semi-detached or terraced) | Census 2021 | nomisweb.co.uk |
| Tree preservation orders | 4,560 tree preservation orders published by the council | — | planning.data.gov.uk |
| Householder applications granted | 93.7 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Party Wall etc. Act 1996 s.6(5) | 1 months | — | 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
Listed houses and shared walls
The borough lists 1,350 buildings and has 39 conservation areas, so many basement clients live in a listed stucco terrace. For them the SPD adds a further layer: listed buildings: movement history + structural impact; 1.5-2.0 m separation (piled). Excavation beneath a listed building is prevented, which turns a basement under the house into a garden-level basement set apart from it.
Party walls complete the picture. An excavation within 3 metres of a neighbour's building that goes deeper than their foundations needs notice under the Party Wall etc. Act, and the same rule applies at 6 metres where the dig cuts a line drawn at forty-five degrees from the foundation base. The notice must be served at least 1 month ahead.
Our party wall notices service prepares those notices from the engineer's drawings, and if a neighbour does not consent, the surveyors settle an award before work starts.
Who lives here, and what they usually ask for
Only 17 per cent of households here live in a house, and 31.7 per cent own their home. Many structural jobs are therefore a maisonette, a mews house or a flat with a freeholder who must consent.
The borough's 4,560 tree preservation orders and 84 Article 4 directions affect what can be seen and what can be dug. Street trees and garden trees constrain piling positions, and Article 4 directions can hold back changes to front elevations and roofs even where the structure inside is straightforward.
Householder planning is a high-success process here. The council granted 93.7 per cent of its 664 householder decisions.
Beams, lofts and rear additions without a basement
Many clients do not want a basement. A rear opening, a loft over a terrace or a lateral conversion across two houses all rely on structure that has to be sized and drawn. Our house extension drawings in Kensington and Chelsea show how a rear addition is dealt with in planning.
The engineering is closer to ordinary Part A work than a basement, but the stucco terrace is unforgiving. Front walls are thin facades, floors span between party walls, and many houses have been altered more than once. We open up the floor build-up before sizing steel, because a beam deeper than the ceiling void allows is a late redesign.
Coordination is where most of the value sits. In a house that has already been through a refit, the engineer, the planning drawings and the building regulations package are all drawn from one model, so a lowered floor, a new stair opening and a steel line cannot disagree with each other. Our building regulations drawings in Kensington and Chelsea carry the structure into the submission, and the same drawings go to the contractor for pricing, which keeps tenders comparable.
Quote and next step
Send the address, photographs and any plans. We check the listing, conservation area, trees and the ground, then give one fixed quote, with the method statement priced separately when a basement is involved. For a calculation only, see structural calculations in Kensington and Chelsea, and for the wider area read architectural drawings in Kensington and Chelsea.
What you receive
Related pages
Other services in Kensington and Chelsea
Structural engineering nearby
Questions
Who signs a Kensington and Chelsea construction method statement?
A chartered civil or structural engineer. The council's SPD records the requirement as Signed MICE/MIStructE; RIBA Stage D.
Can I dig a basement under a listed house here?
The SPD prevents excavation beneath a listed building. A garden basement can be built if it is structurally separated from the house.
Do I need a basement to need a structural engineer?
No. Opening a wall, adding a floor or enlarging a loft all call for structural design for building control.
Sources and dates
- rbkc.gov.uk, retrieved
- rbkc.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- legislation.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- planning.data.gov.uk, retrieved
- 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.