Chimney breast removal with gallows bracket or beam support in Marylebone. Trusted, professional, 30+ years' hands-on experience.
A redundant breast in a Georgian townhouse off Marylebone High Street can be swallowing the best metre of a bedroom wall. Take it out and the room squares off, the bed finally fits and the alcoves vanish. We support what stays above on a steel beam designed by the engineer we appoint, then cap and ventilate the flue.

Marylebone's mansion blocks and period flats were built with fireplaces in the main rooms, and the breasts often run up through several flats within the block's masonry. Removing one on a single floor means the stack above still has to be carried, so we never simply cut it out. Our engineer decides whether the retained stack is best supported on steel gallows brackets bolted back into the masonry, or on a small beam.
In a flat, you usually only own your own storey, so you cannot remove the whole full-height stack the way a house owner might; the sections above belong to the flats overhead. That makes proper gallows-bracket support essential rather than optional. We prop the breast, take it down in stages, fix the support, cap and ventilate any redundant flue to keep damp out, and replaster so the wall looks as though the breast was never there.
Because the stack is shared with the flats above and below, this is exactly the kind of work your freeholder wants to control. The licence to alter, backed by the engineer's support design, must be in place first, and the managing agent will often notify affected neighbours in the block. Where the party wall to an adjoining building is involved, the Party Wall Act can also apply, and you serve any notices that are needed.
The structural support is notifiable under the Building Regulations, and Westminster City Council's building control signs off the gallows brackets or beam. We carry the whole thing for you: engineer's calculations, freeholder licence and agent liaison, any safe staged removal, flue capping and replastering. Working in an occupied W1 block near Oxford Street, we sheet up, protect the communal areas, and clear the rubble without disrupting your neighbours.
Marylebone owners choose GS Renovation because we support the retained stack properly rather than leaving it hanging. You get an engineer-designed gallows-bracket or beam solution, the freeholder's licence handled, Westminster building control sign-off, and tidy working in an occupied mansion block. More than 30 years in W1 stand behind every job.
Punctual, worked hard, and did exactly what he was asked and what he said he would do. Overall, a very high quality job. Will use again.
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
Really happy with the quality of remedial works carried out by George in putting other previous tradesman work right. He was very helpful, honest and…
FAQ
It compares well, mainly because there is no head office to fund. GS Renovation is the contractor doing the chimney breast removal work at your W1 property, not a broker passing a Marylebone job on with a margin added. You deal with the people on site, and the quotation shows the Westminster City Council element rather than an administration fee. Compare the scope, not just the total. Ring 07472 424 226 and GS Renovation will go through the W1 lines with you. As a rough guide, chimney breast removal in London costs roughly £1,500 to £2,500 for a single floor where gallows brackets are accepted, or £2,200 to £3,250 where a steel beam is needed, which is the more common route now that LABC has withdrawn its standard gallows detail; two floors run £3,000 to £5,000 (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.
It is set out stage by stage before anything starts. For a Marylebone property the chimney breast removal programme names what happens each week, which trades are on site at W1, and when GS Renovation needs access. Where a red-brick mansion-block building requires an extra step, we say so at the outset. That is easier for a Westminster household than explaining it midway through. Ring 07472 424 226 and we will talk through the sequence for a W1 home.
We do what we say, and we put it in writing first. A Marylebone homeowner gets an itemised chimney breast removal quotation, a programme for the W1 property and weekly updates, which removes the guesswork that makes building work stressful. GS Renovation appoints the structural engineer where the design needs one and builds to their specification. Free quotes, no obligation, right across Westminster. Email info@gsrenovationltd.co.uk to arrange a W1 visit. Insurance documents follow on request across Westminster.
It is more complicated, because the flue and stack usually serve several flats and the structure is shared. The freeholder's consent is needed as well as building regulations approval. We assess feasibility at the W1 property with an engineer before committing to anything.
There can be, and we check before any design work begins. Conservation area status, an Article 4 direction or a listing removes permitted development rights at a W1 address, so chimney breast removal may need a full application to Westminster City Council. GS Renovation establishes the position for your Marylebone home first. Building regulations apply regardless of the planning route. Ring 07472 424 226 and we will confirm the designation before any chimney breast removal design work at W1.
It can, because the stack is a single mass of brickwork serving both houses. If their side was taken out without proper support, the load path through the shared masonry changes and your flues and breast can be affected. Look for new diagonal cracking on the W1 party wall and doors that have begun to stick. You are entitled to ask what was approved, and Westminster City Council holds the records.
All of them, including the streets around W1 and out towards Mayfair. GS Renovation treats chimney breast removal across Marylebone as core work rather than an occasional trip, and we are usually on another Westminster site nearby. That often means a survey can happen quickly. Ring 07472 424 226 with the postcode and we will confirm. Nothing is owed for the Marylebone visit either way. Aftercare visits are equally straightforward from a nearby Westminster site.
Every Service, One Team
The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Marylebone. Explore what else we do locally:
Same Service, Nearby Areas
We carry out chimney breast removal across Marylebone and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for chimney breast removal in Marylebone. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.