Structural Alterations Stratford
Structural alterations, new openings, underpinning and floor structures in Stratford, 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
From forming new openings in post-war and new-build flats to replacing tired joists in the Victorian terraces towards Forest Gate, GS Renovation carries out structural alterations right across Stratford. We handle supported openings, replacement joists and underpinning with calculations from the engineer we appoint and building control sign-off included.
In Stratford, 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 Stratford.
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 Stratford address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Newham 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.
Structural alterations across Stratford's mixed housing
Stratford's housing stock is unusually varied, running from new-build riverside apartments near the Queen Elizabeth Olympic Park to solid Victorian terraces towards Forest Gate and West Ham Park, with post-war estates in between. Each type calls for a different approach: a supported opening in a concrete-framed or post-war block deals with concrete or heavy masonry, while an alteration in an E15 terrace works with traditional timber floors and load-bearing masonry. We assess exactly what you have before proposing anything.
Whatever the alteration, the principle stays the same. A structural engineer designs the solution, we install steel beams onto padstones where openings are formed, prop safely and demolish in stages, and strengthen or replace joists where long spans or old notching have weakened a floor. Where foundations have moved, underpinning is designed to suit the ground conditions common across Newham's low-lying, formerly marshy land near the river.
Housing in Stratford
By the valuation list's count, Stratford holds about 17,020 homes, 29% houses and 71% flats; by age, 27% were built before 1919, 1% between the wars and 71% since 1945. Where most homes are flats, structural repair to a block in Stratford usually falls to the freeholder.
Stratford structural work since planning powers left the LLDC
On 1 December 2024 planning powers returned from the LLDC to the London Borough of Newham, which now determines all planning applications. That matters in Stratford because a newer building near the Queen Elizabeth Olympic Park may have been granted permission by the LLDC, while anything new now goes to Newham. When a structural alteration changes the outside, such as a new opening in a rear wall, a door onto a balcony or a widened window, the original permission for the building can carry conditions about its appearance. We pull the old decision notice before designing, so the new application answers those conditions.
In the older streets, Newham lists Stratford St John's and Sugar House Lane conservation areas in E15, and University conservation area in Stratford. Stratford St Johns was designated by Newham Council in January 1984. In a Newham conservation area you may need planning permission for work that would not normally need it, such as changing windows or doors, so a structural alteration that moves a rear door or widens a window needs that check first. Inside those boundaries the structural engineer we appoint details the opening once the planning position is known, not before.
Engineering and sign-off in Newham
Internal structural alterations are governed by the Building Regulations rather than planning permission, so there is no planning application to make, even in a conservation area, unless the outside changes; a listed home needs listed building consent for internal as well as external works that affect its character. Newham Council's building control inspects the works and issues the completion certificate. We manage the notice and the inspection stages so nothing is missed and the paperwork is complete at the end.
In leasehold flats we also help you secure the freeholder's licence to alter and coordinate with the managing agent. Where an alteration touches a wall shared with a neighbour the Party Wall Act may apply, and you serve any notices needed as building owner, using the drawings we give you. We prop and support at every stage of the work and keep an occupied E15 home clean and workable while the alteration is carried out.
- Lintel replacement and repair over failed openings
- Crack repair, helical bar stitching and masonry restraint
- Structural engineer appointed and coordinated for the design
VOA Council Tax stock of properties, March 2025, for Stratford East, Stratford Central, West Ham & Stratford Park and Carpenters Estate & Stratford New Town. Counts rounded by the VOA.
The GS Renovation Difference in Stratford
Owners across E15 trust GS Renovation with structural alterations because we bring one team and full accountability: beams and underpinning built to the engineer's design, the freeholder's licence and your party wall notices backed with the drawings they need, and Newham building control sign-off handled from notice to certificate. Our founder's 30+ years of alterations mean the detail is right, the support is safe and the site stays tidy.
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…
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George was very friendly and helpful from start to finish. He worked really hard to ensure our kitchen was installed to a high standard and was…
FAQ
Frequently Asked Questions about Structural Alterations Stratford
Does the cost of structural alterations rise in a converted or modern Stratford property?
Age affects the cost of structural alterations in Stratford less than people fear; the structural part is broadly similar, within £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (indicative). What differs in converted or modern housing is making good plaster, skirtings and floor finishes around the E15 works, priced as separate lines. The sequence also holds: underpinning is dug in controlled bays, never all at once.
Do structural alterations in Stratford need planning permission?
Usually not. Internal structural alterations, new openings, replacement joists and underpinning are controlled under the Building Regulations, and Newham building control signs them off. Planning permission comes in where the outside changes, and because flats have no permitted development rights, an external change to a flat usually needs it; a listed home needs listed building consent for internal as well as external works. If you live in a leasehold flat, the freeholder's licence to alter is the consent to secure first.
Can I widen a window opening in my Stratford flat?
Possibly, but the external wall normally sits outside your lease, so nothing happens until the freeholder agrees in writing. After that, a lintel is calculated for the wider span, the masonry or cladding is supported while it is cut, and building control inspects it. In a concrete-framed block, the frame position may fix how wide the opening can go.
Can the rear addition of a Stratford terrace be opened into the main house?
Yes, with a beam or lintel over the opening designed by the engineer. The wall between the main house and the rear addition often carries the rear wing's first floor and roof, so both sides are propped before it is cut. If the opening reaches the party wall, you serve notice on the neighbour two months before work.
Does a structural alteration to a Stratford terrace need the neighbour's agreement?
Only if it cuts into the wall you share, for instance to seat a beam. That triggers the Party Wall etc. Act 1996, with two months' minimum lead time on the notice. Your neighbour either agrees in writing or dissents, and a dissent hands the terms to surveyors, whose award governs the job. Serve early, so a finished design is not left waiting on paperwork.
Do old timber lintels in Stratford terraces need replacing when an opening is altered?
Usually. Victorian builders often set a timber lintel behind a brick arch, and by now it may be rotten or crushed where it meets damp masonry. When an opening is widened or disturbed, the engineer typically specifies a steel or concrete replacement, installed with the wall above propped. It is worth checking the lintels over other openings in the same wall.
Can an old outbuilding in a Stratford conservation area come down for new work?
Usually only with planning permission. In a Newham conservation area you need planning permission to demolish a building, and depending on its size a garden workshop or a detached rear structure can count as one. Structural schemes on the older E15 plots sometimes depend on clearing one to make room for new foundations or a rebuilt rear wing. We settle the planning position first, so the structural design is not drawn around a demolition that has not been agreed.
Which structural changes to a listed building in Stratford need Newham's agreement?
Newham says the work needing its agreement on a listed building includes moving or removing internal walls, making new doorways, and removing or changing fireplaces, panelling or staircases. Newham has over 100 listed buildings, from the Spotted Dog pub to Abbey Mills Pumping Station. For a structural alteration that means consent comes before the engineer's final design and before building control, because a consent condition can change how an opening is formed.
Does a Stratford structural job have to go through Newham Building Control?
No, but it is one of two routes. Newham Council runs its own building control service, Newham Building Control, which accepts four different types of application, and a registered building control approver is the alternative. Either way the structural engineer we appoint produces the calculations and an inspector sees the work before it is covered. We set the route at the start, because each one has its own forms and its own inspection booking.
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