Chimney stacks are named in Radlett's conservation area appraisal as part of what the designation exists to protect, so removing a breast here is a structural job with a heritage question attached. We appoint the engineer, support whatever stays up, and settle the consent position before a brick moves.
Why chimney stacks matter to Hertsmere in Radlett
Because their loss is recorded as a threat. The Radlett (North) Conservation Area Appraisal lists the removal of redundant chimney stacks among the alterations that pose a threat to the special character of the area. Radlett has two conservation areas, Radlett (North) and Radlett (South), and both were designated on 20 April 1988.
Radlett (North) covers Watling Street from number 197 south to the Radlett and Bushey Reform Synagogue, plus all of Park Road, Station Road, Upper Station Road, Malt Lane and Aldenham Road. It also takes in the residential area known as The Grove to the north west, Slade Court to the south, and parts of Newlands Avenue, Watford Road, The Crosspath, Gills Hill, Scrubbitts Park Road and Barn Close. If your address is on that list, what happens above the roofline is a different conversation from what happens to the breast inside.
What the stacks look like on Watling Street and Loom Lane
They are a designed feature rather than an accident of heating. In Character Zone 1, Watling Street, which is the High Street core of Radlett (North) Conservation Area, the appraisal records the prevalent chimney stacks as red brick, projecting above the roofline with chimney pots.
The original houses on Loom Lane share an Arts and Crafts influenced form of two storeys in brick and tile construction, with gables, chimneys, traditional glazing and pitched roofs. Where the stack is part of the composition, the route that keeps the elevation intact is to take the breast out at ground floor level and leave the stack in place above. That means the retained stack has to be supported, on gallows brackets bolted into sound masonry or on a small beam where the loads rule brackets out. A stack is never left standing on nothing.
Breasts in the Cobden Hill and Station Road terraces
In a terrace the stack sits in masonry you share, and Cobden Hill shows the arithmetic. Numbers 5 to 15 Cobden Hill are a row of six red brick cottages of one and a half storeys, with hipped tile roofs and three large decorated chimney stacks. Numbers 17 to 23 Cobden Hill are a row of six red brick and pebble dashed two storey terraced houses, with hipped tile roofs, small end gables and three large chimney stacks. Three stacks serving six houses means the brickwork you are cutting into is doing work for the property next door as well.
The Radlett (North) Conservation Area Appraisal describes Station Road and Upper Station Road as late Victorian two storey terraces in stock brick with orange brick dressings, under slate roofs with decorative orange ridge tiles. Cutting a pocket into a shared wall, or bolting brackets through it, is notifiable under the Party Wall etc. Act 1996. The notice is served by you as building owner. We flag it at survey, supply the structural detail your surveyor needs, and plan the works around the notice period.
Consent and sign off before anything comes out
Taking a whole stack down inside a conservation area is not automatically yours to do. Demolishing a building, or the principal part of a building, in one of Radlett's conservation areas needs planning permission from Hertsmere Borough Council before work starts. That is known as relevant demolition, and carrying it out without permission is a criminal offence. Hertsmere's conservation areas page still uses the older term conservation area consent, abolished in England on 1 October 2013. Whether a particular stack removal falls inside that depends on what is being taken down, so we put the question to the council rather than guess.
The support itself is a Building Regulations matter. Hertsmere Borough Council's planning and building control pages direct building control enquiries to Hertfordshire Building Control, a not for profit organisation contactable on 01438 879990. Removing a breast on one floor with gallows brackets accepted runs from £1,500 to £2,500, and from £2,200 to £3,250 where a steel beam is needed. Two floors runs from £3,000 to £5,000 (indicative London ranges, MyBuilder and Checkatrade, 2026).
- Steel beam support where gallows brackets are unsuitable
- Ground floor removal with the upper stack fully supported
- Structural engineer's calculations arranged and followed
- Bedroom breast removal to reclaim usable floor space
- Rubble bagged and carried out rather than dropped inside
Why Radlett Homeowners Choose GS Renovation
A Radlett chimney breast job has three consent strands running at once, and we keep hold of all of them. The conservation area position is put to Hertsmere in writing, and the party wall obligation is flagged early with the structural detail your surveyor will want. The support itself is designed by the engineer we appoint and inspected by building control. Redundant flues are capped and vented rather than sealed, so nothing comes back through the new plaster later. We are fully insured and quotations are free and carry no obligation.
- Photographs kept at each stage for your records
- Rated 4.9 from 31 reviews on MyBuilder
- Hearth and floor structure reinstated where the breast is removed
- Founder-led team with 30+ years of hands-on experience
- Cornice, skirting and picture rail matched back in
- Gallows brackets fixed only into sound party wall brickwork