Gallows Brackets vs Steel Beam — Why Councils Now Require Steel
If you're removing a chimney breast in a London or Essex terrace, the rules have changed. Most Building Control bodies now require a steel beam, not gallows brackets. As structural engineers designing these jobs every week across Ilford, Redbridge, Newham, Tilbury, Grays and Thurrock, gallows brackets is a method we now specify only in rare, narrowly defined cases.
This guide explains why, what councils expect instead, and what the steel beam route looks like in practice.
If you already know you need a steel beam designed, go straight to our chimney breast removal service. Otherwise read on.
The Short Answer in 2026
- Default specification: steel beam
- What most London Building Control bodies accept: steel beam
- What most Approved Inspectors accept: steel beam
- What party wall surveyors are comfortable with: steel beam
- What buyer's surveyors do not flag at resale: steel beam
- Where gallows brackets still occasionally work: narrow, well-evidenced cases on solid Victorian party walls with single-floor removal — and only with prior Building Control sign-off
If you take nothing else from this guide: plan for a steel beam. If your specific Building Control body confirms gallows brackets are acceptable for your project, treat that as a bonus, not the starting point.
Why the Industry Has Moved Away from Gallows Brackets
Why the Industry Has Moved Away from Gallows Brackets
The shift from gallows brackets to steel beams across London Building Control has been driven by four practical concerns:
- Verification of party wall masonry is hard. Gallows brackets only work if the wall they bolt into is genuinely solid, sound masonry. In a typical chimney removal, the surveyor cannot see the full thickness of the wall behind the plaster. Boroughs increasingly take the view that this is too much risk on something that cannot be inspected reliably.
- Inconsistent installation quality. Brackets must be bolted with the right fixings, at the right depth, with the right edge distance. Repeated inspections across London found installations that were technically non-compliant but already plastered over.
- No future-proofing. A house with gallows brackets supporting the upper breast cannot easily have that upper breast removed later. A steel beam can.
- Buyer's surveyor risk at resale. Even when properly installed, gallows brackets are increasingly flagged in homebuyer surveys, triggering retention, indemnity insurance, or remedial works on sale. Steel beams are not.
The combined effect: most London Building Control bodies and most Approved Inspectors now require a steel beam as the default specification for chimney breast removal. Some still accept gallows brackets in narrowly defined cases, but it is no longer the path of least resistance.
What is a Gallows Bracket?
A gallows bracket is a triangular steel angle bracket bolted horizontally into the party wall above the removed chimney breast. A pair of brackets — one each side of the chimney — supports a steel angle that carries the upper chimney breast and stack above.
It was the standard method across London for decades and there are tens of thousands of properties supported on gallows brackets that have performed well for 30, 40, 50 years. The method is not unsafe in itself — but it relies on the party wall masonry being genuinely solid and capable of resisting the bolt fixings under sustained load, which surveys repeatedly show is harder to verify than originally assumed.
That verification problem is the main reason councils have moved away.
What is a Steel Beam Support?
A steel beam — typically a 152x89 UB16 or 178x102 UB19 universal beam — is installed horizontally across the chimney opening, bearing on padstones built into the masonry either side of the chimney. The beam carries the upper breast and stack above.
Unlike gallows brackets, the steel beam doesn't rely on the party wall accepting bolted loads — it transfers everything down through end bearings into solid masonry. It's a more universal solution and almost always satisfies Building Control without question.
For sizing, see our guide on what size steel beam you need.
Side-by-Side Comparison
| Factor | Gallows brackets | Steel beam |
|---|---|---|
| Engineer fee | £350 – £500 | £450 – £800 |
| Builder labour | £1,200 – £2,000 | £2,500 – £4,500 |
| Time on site | 1 – 2 days | 3 – 5 days |
| Total job cost | £1,750 – £2,900 | £3,200 – £5,700 |
| Suitable for solid masonry party wall | ✅ Yes | ✅ Yes |
| Suitable for cavity party wall | ❌ No | ✅ Yes |
| Suitable for both-floor breast removal | ❌ No | ✅ Yes |
| Accepted by London Building Control in 2026 | ❌ Rarely — most now require steel | ✅ Yes — standard specification |
| Causes loss of headroom | ❌ No | ⚠️ Small (beam depth) |
| Future-proof for upper-breast removal later | ❌ No | ✅ Yes |
| Best for resale and surveyor confidence | ⚠️ Sometimes flagged | ✅ Always accepted |
When (Rarely) Gallows Brackets Are Still Acceptable
There is still a narrow window where a Building Control body may accept gallows brackets — but every condition has to be satisfied, and you need it confirmed in writing before the design is committed:
- The party wall is solid masonry (not cavity, not blockwork), at least 215mm thick, in good condition
- You are only removing the ground-floor breast — first floor and stack above stay
- The chimney above is a typical residential size — single flue, central, no offset
- Your specific Building Control officer confirms in writing they will accept gallows brackets for your project
- You are not planning to remove the upper breast later
In practice this combination is now uncommon enough that we treat steel beam as the starting point on every quote. If the conditions above are met and Building Control confirm acceptance, we will design gallows brackets where it genuinely saves the homeowner money. We will not specify them speculatively.
Why a Steel Beam is the Default in 2026
A steel beam is the standard specification because it works in every situation and is accepted by every Building Control body:
- The party wall can be solid or cavity — the beam transfers load to padstones, not bolt fixings
- It works whether you remove one floor or both
- It handles large or asymmetric chimneys, multiple flues, and unusual geometries
- It future-proofs the property — the upper breast can be removed later without redesigning the support
- Buyer's surveyors don't flag it at resale — the structure is conventional and unambiguous
- Party wall surveyors are familiar with it — fewer queries, faster Award
This is why our standard recommendation across Ilford, Redbridge, Newham, East London, Tilbury, Grays and Thurrock in 2026 is a steel beam.
Which London Boroughs Now Require Steel Beams?
There is no single national rule — each Building Control body sets its own approach — but the direction of travel is clear. Based on our experience across 2025–2026:
| Area | Typical position (2026) |
|---|---|
| Redbridge (Ilford, Wanstead, Woodford) | Steel beam expected; gallows brackets only with strong evidence |
| Newham (Stratford, East Ham, Forest Gate) | Steel beam required in practice |
| Tower Hamlets | Steel beam required in practice |
| Hackney | Steel beam required in practice |
| Waltham Forest | Steel beam expected |
| Islington / Camden | Steel beam required |
| Thurrock (Tilbury, Grays) | Steel beam expected; cavity housing stock makes brackets unsuitable anyway |
| Approved Inspectors (private) | Most now require steel beam; very few still accept brackets |
The pattern is consistent: steel beam is now the expected specification. We always confirm with the specific Building Control team, but we no longer plan jobs around gallows brackets.
Party Wall Implications
A chimney breast removal in a terrace or semi requires a Party Wall Award under Section 2 of the Party Wall etc. Act 1996, because the steel beam pockets into the party wall for end bearing. See our party wall agreement guide for the full process.
Party wall surveyors are well-used to reviewing steel beam chimney designs — the load path is conventional, the calculations are standardised, and Awards typically issue without extra technical queries. This is another practical reason the steel beam route now runs more smoothly than gallows brackets.
What We Specify Across Our Patch in 2026
To give you a sense of our actual decision pattern this year:
- Victorian solid-wall terrace, Ilford or Stratford, ground-floor only: Steel beam by default. Gallows brackets considered only where Building Control pre-confirm acceptance and the wall is demonstrably solid — a small minority of cases.
- 1930s semi, Redbridge: Steel beam every time. Cavity walls are common and rule out brackets regardless of council position.
- 1960s–1980s Tilbury / Thurrock estates: Steel beam every time. Lightweight inner leaves and cavity walls rule out brackets.
- Both ground and first-floor removal anywhere: Steel beam — brackets cannot carry that span.
In short: plan for a steel beam.
What We Need From You to Quote
To give you a fixed-fee quote for a steel beam chimney removal:
- A photo of the chimney breast on each floor (front and side if possible)
- A photo of the party wall in the loft (so we can see the chimney structure above)
- Approximate width of the breast (tape measure fine)
- Whether you want one floor or both removed
- Postcode
We'll come back the same day with a fixed fee, the beam size, and the structural detail.
Get a Fixed-Fee Quote for Your Chimney Removal
SBS is based in Ilford and we design chimney breast and stack removals across Ilford, Redbridge, Newham, East London, Tilbury, Grays and Thurrock. Our standard 2026 specification is a steel beam, sized and detailed for your specific property, in line with what Building Control now require.
📞 Call 07401 650600 or email us with photos of the chimney and we'll quote the same day.
Related reading:
