Structural Alterations Brentwood
Structural alterations, new openings, underpinning and floor structures in Brentwood, designed by the engineer we appoint and inspected at every stage.
- Rated 4.9 from 31 reviews on MyBuilder
- Guide from £1,500 (London-derived)
- Free site survey, itemised quote
Structural alteration covers anything that changes how a building carries its own weight: new openings, removed walls, altered floors, new steel. We survey, appoint a structural engineer, build to the calculations they issue and coordinate the consents. We do not write structural calculations and we are not surveyors or architects. This page explains which consents apply in Brentwood and who issues them.
For Brentwood, on London-derived ranges a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000; Essex work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Brentwood.
Price guide
| Work | Indicative range |
|---|---|
| Simple new opening | from £1,500 |
| Underpinning, single elevation | £6,000 to £21,000 |
| Major structural works | from £15,000 |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Essex work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.
How the job runs
- Free site survey at your Brentwood address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Brentwood Borough Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props and any trial holes first, then the opening, joists or underpinning in the engineer's sequence.
- Building control inspects each stage before it is covered, then issues the completion certificate.
Two separate consents, both dealt with by Brentwood Borough Council
Brentwood Borough Council is the local planning authority and the building control authority for Brentwood, and it works from the Town Hall on Ingrave Road, Brentwood CM15 8AY. Planning permission and building regulations approval are different decisions with different tests, and a job can need one, both or neither.
The council's building control service accepts building notice applications, full plans submissions and regularisation certificate applications, plus a notice of intended demolition. Which route suits your job depends on how much is being altered and whether any of it is coming down. We settle that before work starts rather than after.
Housing in Brentwood
Brentwood has around 25,620 homes on the Council Tax list: 78% post-war, 11% interwar and 11% predate 1919, with 32% flats and 68% houses. Underpinning the shared wall of a semi in Brentwood needs a party wall notice, and 21% of homes here are semi-detached.
There are 512 listed buildings in the borough, and listing brings a separate consent
Brentwood Borough Council records 512 listed buildings in the borough: 12 at grade I, 27 at grade II* and 473 at grade II. About thirty entries on the statutory list stand inside the Brentwood Town Centre Conservation Area alone. Listing covers the interior as well as the outside, so internal structural work is caught by it.
Where a proposal affects a designated heritage asset, including a conservation area, Strategic Policy BE16 of the Brentwood Local Plan requires a Heritage Statement setting out the significance of the asset and the potential impacts of the proposal. That is a document to commission early. We tell you when your property looks likely to need one, and build to whatever comes out of it.
Brentwood's Article 4 position: check your address, not the neighbour's
Brentwood's published records show no Article 4 direction made: the adopted Policies Map has no Article 4 layer, and the Local Plan mentions Article 4 directions only as a tool the council may use. Outside the conservation areas, householder permitted development applies in the usual way. A direction can be made at any time, so check the council's own list for your address before relying on either.
The Brentwood Town Centre Conservation Area Appraisal proposes that an Article 4 direction should make planning permission necessary for alterations affecting windows, doors or other openings, including the insertion of new windows and doors. Published records show that direction has not been made. Conservation area controls still apply in their own right, so check your address rather than assume either way.
What the council asks to see, and how long its advice takes
Brentwood Borough Council's householder application guide asks for a site location plan at 1:1250 in urban areas or 1:2500 in rural areas. It also asks for a site layout plan at a scale not less than 1:500, and elevations and floor plans at 1:100 or 1:50. Drawings at the wrong scale get an application returned before anyone looks at its merits.
The council gives no target date for a written response to its householder pre application advice service, and states that advertised time frames are taking longer than anticipated. If you want a view before you commit, ask early and put the wait into your planning stage rather than into your build programme.
- Floor structure, joist and beam replacement
- Drainage diversion and build-over agreements where required
- Crack repair, helical bar stitching and masonry restraint
VOA Council Tax stock of properties, March 2025, for all 6 statistical areas in Brentwood. Counts rounded by the VOA.
Why Brentwood Homeowners Choose GS Renovation
Structural alteration goes wrong at the joins: between the engineer and the builder, between planning and building control, between the steel arriving and the wall coming down. We hold all of those. We appoint the structural engineer, build to the calculations they issue, make the building control application to Brentwood Borough Council and book the inspections around our own programme. Where heritage consent is in play we tell you before the design is fixed, not after it is refused. GS Renovation Ltd is a contractor, fully insured, registered in England, company number 14611254, with one point of contact from survey to sign off. Quotations are free and without obligation.
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FAQ
Frequently Asked Questions about Structural Alterations Brentwood
Why do structural alterations quotes in Brentwood vary so much?
Quotes for structural alterations in Brentwood vary because they rarely price the same work, even inside £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (London-derived). One builder includes making good and an engineer's design approved before the work starts, another leaves both out. GS Renovation itemises every line for the CM14 property, so you can see what is in and what is missing. Compare scope before totals.
We need to cut back a tree in a conservation area for access. How much notice does the council need?
Six weeks, in writing. Anyone carrying out works to a tree in a Brentwood conservation area must give written notification to the local planning department at least six weeks beforehand. That runs in parallel with your building control application rather than instead of it. Put the notification in as soon as the design is fixed, so rear access is not the thing holding up a steel delivery.
The house sits on a former industrial site. Does that add a step before the structure can be altered?
It can. Policy NE10 of the Brentwood Local Plan requires development on or near known or potentially contaminated land to submit a Phase 1 Preliminary Risk Assessment, with a Phase 2 Intrusive Site Investigation where that assessment shows one is needed. Those are specialist reports you commission and the council reads. They sit ahead of the design. Ask the council early whether your address is flagged, and put the wait in your planning stage.
Who deals with surface water if an alteration changes where rainwater goes?
Essex County Council, as the Lead Local Flood Authority for Brentwood, alongside Brentwood Borough Council for planning and building control. Two authorities, two remits. If the alteration adds hard surface, moves a downpipe or changes a soakaway, that is where the surface water question lands. We set out on a drawing where the water goes before the work and after it, so the answer exists on paper rather than in an argument later.
A neighbour was told something different a few years ago. Is older council policy still relevant?
Check the date on it. The Brentwood Local Plan 2016 to 2033 was adopted on 23 March 2022, and it superseded earlier policies, Policy GB5, Extensions to Dwellings, of the Brentwood Replacement Local Plan 2005 among them. Advice written against a superseded policy no longer describes the test your proposal faces. Anything dated before March 2022 needs checking against the adopted plan before you rely on it.
Our conservation area has no published appraisal. What is an alteration judged against?
The adopted Local Plan, plus the conservation officer's own reading of the area. Brentwood Borough Council publishes appraisals for eight of its 13 conservation areas: Blackmore, Brentwood Town Centre, Fryerning, Great Warley, Herongate, Highwood Hospital, Ingatestone High Street and Ingatestone Station Lane. South Weald, Hutton Village, Weald Park, Thorndon Park and Warley Place have none. Without one there is no published description of what gives the area its character, so ask before the design is fixed.
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