In a detached Mill Hill house the stack usually sits within your own walls rather than in a wall shared with a neighbour, which simplifies the paperwork but not the structure. Whatever is left standing above still has to bear onto something. We appoint the engineer, build the support to the calculation, and put it through Barnet building control.
Removing a chimney breast in NW7
Mill Hill's substantial detached houses were built with fireplaces in most principal rooms, so there is often a breast in the front reception, another behind it and a third in the bedroom above. Removing the ground floor breast on its own leaves the brickwork of everything above hanging on whatever you put underneath it. That support is designed by a structural engineer. Since the LABC withdrew its standard gallows bracket detail in 2024, inspectors now generally expect a beam bearing onto padstones instead of brackets, and a beam is what we price for.
Sequence keeps it safe. Where breasts come out on more than one floor we work from the top down, so the masonry above whatever is being cut has either gone already or has its permanent support in place. Redundant flues are capped and ventilated top and bottom, because a sealed flue is how you get damp staining appearing in a bedroom two winters later. The hearth comes up as well, and in these houses that usually means breaking out a concrete slab under the floorboards and trimming the joists back properly.
The Ridgeway, the conservation area and the roofline
Taking a breast out inside your house is one question; taking the stack off the roof is a different one. The chimneys and roofline through Mill Hill Village and along The Ridgeway are part of what the conservation area designation exists to protect, so we treat removing a stack above roof level as a planning question and check the position with Barnet before it is priced. If the house is listed, then removing internal chimney breasts needs listed building consent too, because listing covers the inside as well as the elevations.
Where the stack stays, the retained masonry has to be properly supported and left weathertight. Where it goes, scaffolding is up before the roof is opened, the covering is stripped back, new rafters and trimmers are formed where the brickwork passed through, and tiles are matched rather than made do with. We make the roof watertight again before any internal demolition starts underneath it, because a wet week partway through a chimney job does far more damage to a house than the demolition ever will.
- Fireplace opening infill and new plasterboard finish
- Structural engineer's calculations arranged and followed
- Ground floor removal with the upper stack fully supported
- Making good, plastering and reinstating the wall line
- Chimney breast removal on one floor or on every floor
Why Choose GS Renovation in Mill Hill
Owners in NW7 use us for breast removals because we treat it as structural work rather than a demolition day. The engineer's design, the propping, the beam and padstones, the capped and ventilated flue, the making good and Barnet Council's building control sign off are handled by one team. Where the stack is visible in the conservation area we establish the planning position first, instead of discovering it halfway through.
- Party Wall Act notices served for stacks in a shared wall
- Paperwork and certificates handed over for when you sell
- Rubble bagged and carried out, not tipped into the room below
- A written scope and programme agreed before work starts
- Our own trades on site rather than a chain of subcontractors
- Cornice, skirting and picture rail matched back in