Residential work across Hillingdon, calculated and signed by a chartered structural engineer: wall removals, beams and lintels, pad foundations, new loft floors, and underpinning where a basement demands it. Written to Eurocode, fit for Building Control the day it is issued.
Whenever a load path changes, including on work that needs no planning application. Hillingdon told 354 of 476 larger-extension notifications that no prior approval was required — and every one of those 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 |
| 6m rear extension under prior approval | Yes | notification, £249 |
| Rear dormer under Class B | Yes | certificate, not permission |
| Loft floor to habitable use | Yes, 1.5 kN/m² | — |
| 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; Hillingdon figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026. Read at 1 September 2026. A planning ruling never substitutes for building control approval.
For Hillingdon homeowners in 1930s semi-detached dominates; Metropolitan Green Belt covers much of north Hillingdon; Victorian cottages in Uxbridge and Ruislip villages; post-war housing near Heathrow, a structural calculations package is the full measured-survey-to-submission drawing set London Borough of Hillingdon 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 Hillingdon — steel beams, lintels, pad foundations, wall removals, loft floor joists, underpinning. Eurocode-compliant, Building Control-ready.
Housing stock in Hillingdon: 1930s semi-detached dominates; Metropolitan Green Belt covers much of north Hillingdon; Victorian cottages in Uxbridge and Ruislip villages; post-war housing near Heathrow.
Character: Largest outer west London borough; significant Green Belt; Heathrow noise contours affect planning decisions in Harmondsworth and Sipson.
Steel beam and padstone design for the moment a Hillingdon kitchen is opened up, two reception rooms become one, or the whole ground floor goes open-plan.
Ridge beams, purlins, dormer framing, and the joist upgrade the existing loft floor will need. That is the standard set behind any habitable loft in Hillingdon.
Pad, strip or trench-fill foundations, designed around the ground at that address, the proximity of trees, and the run of the existing drains.
New window and door openings: steel, concrete or timber lintel specified, with the bearing calculation that goes underneath it.
Underpinning sequences, reinforced concrete slab design and retaining walls for Hillingdon basement work, staged so that the temporary condition is safe, not only the finished one.
Nothing leaves the office unsigned. A chartered engineer — CEng, MIStructE or MICE — puts a name to each set, and that is the basis on which Building Control bodies across England accept it.
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.
Which districts of the borough we work in, what fills them, and the authority validating a structural calculation package at each. Figures in the fee column are 2026 England statutory rates, not our engineering charges.
| Postcode | Area | Dominant stock | What it means for a structural calculation package |
|---|---|---|---|
| UB8 | Uxbridge / Cowley | Georgian fragments, 1930s semi-detached, post-war flats | Uxbridge and Cowley addresses in UB8 fall to Hillingdon Council, assessed against its Local Plan policies for the town. |
| UB9 | Denham / Harefield | Tudor and Georgian fragments, 1930s semi-detached | UB9 straddles the county boundary. Harefield sits in Hillingdon and its structural calculation package goes to Hillingdon Council; Denham, on the far side of the line, is in Buckinghamshire and is determined by Buckinghamshire Council. Establish which authority the address falls to before submitting anything. |
| UB10 | Hillingdon / Ickenham | 1930s semi-detached, Tudor fragments | Hillingdon village and Ickenham lie wholly inside UB10, so every structural calculation package from a UB10 address is validated by Hillingdon Council. |
| UB11 | Stockley Park | 1930s semi-detached dominates: 29.8% of the 118,250 dwellings in the borough come from that decade, with pre-1900 stock at just 1.8% (VOA CTSOP4.1, 31 March 2025). Metropolitan Green Belt covers much of the north, with older cottages in the Uxbridge and Ruislip villages and post-war housing towards Heathrow. | A UB11 address at Stockley Park is determined by Hillingdon Council, under the Local Plan policies written for Stockley Park itself. |
| HA4 | Ruislip | 1930s semi-detached, Tudor cottages | HA4 is Ruislip, all of it inside Hillingdon. The council handles the structural calculation package, and Ruislip case officers check the address against the HA4 conservation-area map. |
| HA5 | Pinner / Eastcote | Tudor fragments, Edwardian villas, 1930s semi-detached | Pinner and Eastcote are split by the HA5 boundary, so a structural calculation package there may be validated by Hillingdon Council or by Harrow Council, and it is the policies map that settles which, street by street. |
| HA6 | Northwood | 1930s detached, Edwardian villas | HA6 is Northwood, entirely within Hillingdon. The structural calculation package goes to the council, and Northwood officers read the address against the HA6 conservation-area map. |
| UB3 | Hayes / Harlington | 1930s semi-detached, post-war estates | Hayes and Harlington sit wholly within UB3, so Hillingdon Council validates every structural calculation package submitted from a UB3 address. |
Plot depth, wall build-up and roof pitch all move across a few Hillingdon streets, and each alters the problem an engineer is being asked to solve there.
Conservation areas covering Hillingdon: Hillingdon Council runs 29, and Harefield, Ickenham, Uxbridge are the ones Hillingdon owners meet most. A structural calculation package inside a Hillingdon conservation area loses permitted development, so the Hillingdon submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Uxbridge a structural calculation package is judged on the street elevation first.
Hillingdon permitted development status: there is no borough-wide direction from Hillingdon Council, so a structural calculation package at a HA4 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Hillingdon sale to argue it later.
What Hillingdon is built from: 1930s semi-detached dominates; Metropolitan Green Belt covers much of north Hillingdon; Victorian cottages in Uxbridge and Ruislip villages; post-war housing near Heathrow. Largest outer west London borough; significant Green Belt; Heathrow noise contours affect planning decisions in Harmondsworth and Sipson. That mix decides the structural calculation package route in Hillingdon more than the postcode does, and it is what a Hillingdon Council case officer reads first. A householder application costs £548 paid to Hillingdon Council direct, with 8 weeks to a decision once validated.
Sources for this Hillingdon 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.
Straight answers to what Hillingdon homeowners actually ask us about structural calculations.
Start a free quote →Structural fees in Hillingdon scale with the intervention. The smallest package is a lone beam spanning one wall removal. Ridge beam, purlins, lintels and foundations together make up the full loft or extension set, which is larger. Anything involving a basement or more than one storey is quoted on its own terms. Chartered engineer sign-off comes with all of them. See our fees.
Yes. Removing or altering a load-bearing wall in a Hillingdon house means calculating the replacement beam and its bearings and proving they take the load. Without a chartered signature on that arithmetic, Building Control will not pass the work, and even a partition is worth checking before anyone opens it up. There is a second reason to have the numbers early. Refusals in this borough are unusually worth contesting: of 2,062 Hillingdon appeals reaching a decision, 814 were allowed and 1,248 dismissed, an allowed share of 39.5% (Planning Inspectorate decisions from 2016 onwards). Read that as an appeal outcome and not as an approval rate, since only refused applicants ever appeal. What it does say is that an argued case here often succeeds, and what wins those cases is evidence — including a demonstration that the scheme is structurally deliverable exactly as drawn.
Give us the architectural drawings and the site dimensions and calculations follow within one to two weeks. A fast-track option returns them in three to five working days for a small premium.
Two different questions. A structural survey reports on the building already standing, its defects, its movement, any subsidence. A calculation package designs what is not there yet: beams, foundations, loft steelwork. Nearly every Hillingdon extension or loft needs the second and not the first. Calculations are what we produce; where a condition report is what you actually want, we can put you in touch with a surveyor.
Yes. We take structural calculations on their own where the architectural drawings came from another practice. Need both, and the Complete package carries drawings and structural design together, priced under the sum of the two bought separately.
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