Structural Alterations Havering
Structural alterations, new openings, underpinning and floor structures in Havering, designed by the engineer we appoint and inspected at every stage.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: from £1,500
- Free site survey, itemised quote
GS Renovation carries out structural alterations throughout Havering, from new openings in the interwar semis of Romford to replacement joists and supported openings in Hornchurch and Upminster. We form new openings, renew tired joists and underpin where the ground demands it, all to an engineer's design.
In Havering, a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000 (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Havering.
Price guide
| Work | Indicative London 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. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.
How the job runs
- Free site survey at your Havering address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Havering 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.
New openings and joists in Havering homes
The generous plots of Havering's interwar houses give real scope for structural change: a wider opening between kitchen and garden room, a supported opening onto a side extension, or replacement joists where an original floor has sagged over ninety years. Each of these needs a structural engineer to specify the steel or timber and its padstones, and each is built with temporary propping and staged, careful demolition.
Some of Havering's suburban homes off the busier RM3 and RM14 roads show movement in older extensions or bay fronts, where underpinning or a beam over a failed lintel is the right answer. We investigate before we quote, so the work matches what the house actually needs rather than a guess, and every opening is formed on proper bearings that spread the load into sound masonry.
Housing in Havering
Roughly 108,680 dwellings sit on the valuation list for Havering. 74% are houses and 26% flats, and by age 5% predate 1919, 36% are interwar and 59% post-war. Semi-detached houses make up 29% of homes here, and underpinning the shared wall of a semi in Havering needs a party wall notice.
Sewers and demolition notices in Havering structural work
In Havering you must make a full plans application, not a building notice, if the work is near a public sewer. Structural alterations at the back of a house can be. A widened rear opening needs new foundations under its piers, and a replacement for a failed back addition can put new footings close to the drain leaving the kitchen and bathroom. Before the structural engineer we appoint fixes a foundation position, find out where the sewer runs. Lifting the inspection chamber covers or a short drainage survey is usually enough to settle it, and the answer decides the approval route, the foundation design and sometimes where the new opening goes.
Some structural jobs in Havering start by taking something down, such as a detached garage or an old outbuilding in the way of the new work. Havering asks anyone planning to demolish a building to tell the council at least six weeks before starting the work, and it has a separate demolition notice charge for small schemes up to the size of a single dwelling. In a conservation area, Havering requires consent for the total or substantial demolition of any building of 115 cubic metres or more. Put the demolition notice into the programme alongside the building control application, so a six week wait does not appear after the scaffold arrives.
Regulations and party walls in Havering
Structural alterations inside your home fall under the Building Regulations, so Havering Council's building control or a registered building control approver reviews the engineer's calculations and inspects the work before certifying it. Planning permission is only involved where the outside changes beyond permitted development, which is tighter in a conservation area, and a listed building needs listed building consent for internal work too; both are separate from the structural sign-off.
In the borough's semi-detached and terraced stock, alterations near the wall shared with a neighbour are notifiable under the Party Wall Act, and underpinning close to the boundary almost always is. You serve those notices as building owner, or your surveyor does. We coordinate the engineer, prop and build safely, build to any award and see the certificate through, so one team stands behind the whole alteration from survey to completion.
- Crack repair, helical bar stitching and masonry restraint
- Lintel replacement and repair over failed openings
- Reinstatement, plastering and finishing after structural works
VOA Council Tax stock of properties, March 2025, for all 30 statistical areas in Havering. Counts rounded by the VOA.
Why Havering Homeowners Choose GS Renovation
Havering homeowners choose GS Renovation for structural alterations because we bring one accountable team to the whole job. We appoint the engineer who designs the work, and we handle building control sign-off and safe on-site propping, with tidy working in your home and our founder's 30+ years of structural experience behind every opening and repair.
We loved working with George and Ibrahim and would highly recommend them. They have done splendid job on our new kitchen refurb which including new…
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
FAQ
Frequently Asked Questions about Structural Alterations Havering
Can you quote structural alterations for an RM1 property over the phone?
GS Renovation will not give a real quotation for structural alterations in Havering over the phone, only the range, £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (indicative). On 07472 424 226 we can explain what moves the cost and whether the job needs building regulations approval of the engineer's design, but the RM1 property has to be seen first. Builders who quote blind across Havering revise the figure once the floor or walls are opened.
Do I need planning permission for structural alterations inside my Havering house?
Usually not. Internal structural work, whether a new opening, replacement joists or underpinning, is controlled under the Building Regulations, so Havering Council's building control signs it off rather than planning. Planning comes into play only for external changes beyond permitted development, which is tighter in a conservation area, but a listed building needs listed building consent for internal work too. Where a shared wall is affected, the Party Wall Act may also apply; you serve that notice as building owner, and we give you the drawings and programme it needs.
Can I widen the opening onto the garden at the back of my Havering house?
Yes, with a lintel or steel over the new width that the engineer sizes for the wall above. Interwar houses often have cavity walls, so the detail has to carry both leaves and include a cavity tray to keep rain from tracking inward. Building control inspects the bearings, and the new glazing has to meet current insulation standards before the reveals are finished.
When does a crack in a Havering bay front mean underpinning?
Rarely on first sight. Bays often have shallower footings than the main walls, so some movement is common, and the engineer's job is to decide whether it is still moving. That can mean monitoring the crack for a period before any digging. If underpinning is needed, it is excavated in short sections one at a time, with building control inspecting each before concrete goes in.
Does underpinning near next door in a Havering semi need party wall notice?
Almost certainly, because the attached semi's footings are only a wall's width away. Where the new dig comes within 3 metres of that house and goes lower than its foundations, the Party Wall etc. Act 1996 wants the owner told a month beforehand. Their reply is agreement or dissent; dissent means appointed surveyors produce an award, and no bay of underpinning is opened until it exists.
Can the roof structure be altered in my Havering home?
It can, but roof timbers work as a system. Removing a strut, cutting a purlin or opening a ceiling up to the rafters changes how the roof loads reach the walls, so the engineer designs replacement steel or timber and its bearings. Where that bearing sits in the party wall with the adjoining semi, a party structure notice is needed, and building control approves the design.
Does taking down a detached garage in Havering mean telling the council first?
Havering asks anyone planning to demolish a building to tell the council at least six weeks before starting the work, and it charges a demolition notice fee for small schemes up to the size of a single dwelling. Check with Havering building control whether your garage or outbuilding falls within that before the programme is fixed. If it does, give the notice when the extension drawings are submitted rather than when the skip is booked, so the six weeks run while approvals are being decided.
What changes in a Havering conservation area when an old outbuilding comes down?
In a Havering conservation area, consent is required for the total or substantial demolition of any building of 115 cubic metres or more. A large detached garage or a coach house can reach that volume. Havering has 11 designated conservation areas, including Gidea Park, Cranham and Rainham. Measure the building before assuming its removal is only a building control matter, and allow for the consent in the programme.
Can underpinning in Havering go through on a building notice?
Sometimes, but the drains decide it before the size of the job does. Havering describes the building notice as suited to minor projects, and it requires a full plans application wherever the work is near a public sewer. Underpinning bays and new foundations at the rear of a house can easily fall within that. Have the drain run traced first, then let the structural engineer we appoint set the bay sequence and depths on drawings that go in as full plans where the sewer requires it.
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