Box sash window repair, draught-proofing and restoration sit alongside internal doors, staircases and period joinery on this page, standard non-fire-rated work for London's Victorian and Edwardian terraces, distinct from the certificated fire doors covered on our dedicated fire doors page.
Bromley overview
Sash Windows & Joinery in Bromley
South East London's largest borough by area, with established period housing and demand for roof replacement and general repairs. Bromley falls well within the South East London ground Lian Construction covers on a regular basis. For sash window repair and restoration plus internal doors, staircases and period joinery in Bromley, that local knowledge means fewer surprises once work is on site and a team that already understands the borough's typical property stock.
Bromley is South East London's largest borough by area, and that scale shows in the range of period housing across it. Expect a good deal of Victorian and Edwardian terraced and semi-detached houses in the more established residential pockets, alongside a substantial stock of 1920s and 1930s suburban semis, which is typical of outer London boroughs that grew up around expanding rail links in that era. There are also pockets of larger interwar and postwar detached houses, plus some later 20th-century infill and estate development filling in the gaps between older neighbourhoods. Roofs, chimneys, brickwork and rainwater goods on this older stock are now well past their original design life in many cases, which is a big part of why roof replacement and general repair work is in steady demand across the borough. Because Bromley covers such a wide area, the age and condition of housing can vary a lot street to street, so it is worth getting a property looked at individually rather than assuming what worked next door applies to your own roof or structure.
Given how much ground Bromley covers as London's largest borough, demand for roofing and general repair work is spread thinly across a wide area rather than concentrated in one or two hotspots. That has practical implications for homeowners: it can be harder to find a contractor who is genuinely local to your specific part of the borough and willing to travel efficiently, and lead times can stretch out during busy periods simply because tradespeople are covering more ground between jobs. With so much established period housing, a lot of the work coming through is reactive, roof repairs after storm damage, ongoing maintenance on ageing chimneys and guttering, and general fabric repairs on houses that were not built with modern weatherproofing standards in mind. For homeowners and landlords, this usually means being proactive pays off: getting a roof or exterior condition checked before a leak forces an emergency call tends to be cheaper and less disruptive. It is also worth asking any contractor how familiar they are with the specific area of Bromley you are in, since access, parking and the age profile of housing can differ quite a bit across such a large borough.
Given the amount of established period housing across Bromley, it is worth checking early whether a property sits within a conservation area, as is the case in parts of many outer London boroughs with older housing stock. This can affect what is permitted for roof coverings, chimney alterations, and visible external repairs, sometimes requiring like-for-like materials or additional consent even for straightforward repair work. Not every period property will be affected, and many repairs fall under permitted development, but it is not something to assume either way. If a property is listed or in a conservation area, it is sensible to confirm requirements with the local planning authority before work starts, since retrospective consent issues can cause delays and added cost. A contractor experienced with older properties should be able to flag likely restrictions early, but the homeowner remains responsible for confirming planning status.
Typical sash window & joinery prices in London
Item
Typical range
Sash window draught-proofing, per window
£250–£450
Sash window restoration, per window
£400–£900
Bespoke like-for-like sash replacement, per window
£900–£1,600+
Internal door supply and fit, incl. lining
£250–£650
Staircase repair
£500–£2,500
General London market guidance, not a fixed quote — actual pricing depends on a site survey. Full breakdown: cost guide.
What Drives the Cost, Line by Line
Brush-pile draught-proofing to an existing sash in reasonable condition, no cord or timber repair needed, runs £250–£450 per window in London, reflecting higher labour and scaffold or access costs than the £150–£350 typical of the rest of the country. A fuller restoration, new sash cords, easing and re-hanging, re-puttying, draught-proofing and repainting where the timber itself doesn't need splicing, is typically £400–£900 per window. Where rot has got into the sill or bottom rail and needs cutting out and splicing in new timber, add roughly £150–£250 per repair on top of the restoration cost, since splicing is a skilled joinery repair in itself, not a quick patch. Sash cord replacement on its own is priced by how many cords need doing: roughly £70 for a single cord, £95–£115 for a pair, up to about £150 to replace all four cords in one window. A bespoke like-for-like replacement sash, built and glazed to match the original horns, glazing bars and putty line where the existing frame is too far gone to repair, runs £900–£1,600 or more per window depending on size and whether it's single or double glazed with slimline units. Secondary glazing behind an original sash, rather than replacing the sash itself, is priced separately and covered in detail on our <a href='/eco-retrofit-refurbishment-london'>eco retrofit and secondary glazing page</a>, but broadly runs £350–£600 per window supplied and fitted. On the internal joinery side, a standard flush internal door supplied and fitted, including lining and architrave, is roughly £250–£450 in London, rising to £350–£650 for a period-matched four-panel door built or sourced to suit a Victorian or Edwardian house. Staircase repair for loose treads, squeaking, worn nosings or a wobbly handrail is typically £500–£2,500 depending on how much of the staircase needs attention, while a full staircase replacement on a standard straight or dog-leg stair runs £1,500–£4,000, more for a bespoke or open-tread design.
How Long Sash Window and Joinery Work Takes
Draught-proofing a single sash window, once a sash is out of the frame, routing the brush channel and re-hanging, is typically a half-day to a full day's work per window, so a terrace with 8-10 windows is usually a job of several days rather than weeks. A fuller restoration with cord replacement, re-puttying and repainting takes longer because putty needs several days to skin over before it can be painted, so a sash taken out, restored and reinstalled properly is realistically a week's job per window if you include drying time, even though the hands-on labour is a fraction of that. Splicing rotten timber into a sill or bottom rail adds time for the timber to be cut, glued and left to cure before it's shaped and painted. A single internal door, lining and architrave is typically a one-day fit once the door and lining are on site, longer where an opening in an old house is out of square and needs packing or adjusting to take a standard-sized lining. Staircase repairs from underneath, resecuring treads, wedges and glue blocks, are usually a one to two day job; a full staircase replacement typically takes two to four days including removing the old stair, fitting the new one and making good the surrounding plaster and skirting, though the stair itself is often out of use for at least part of that time, which needs planning around if it's the only way to the upper floor.
We diagnose whether a sticking or draughty sash is a paint build-up problem, a cord problem, or genuine timber rot before quoting a fix, so you're not paying for a full restoration when a service and re-hang would do.Sash cords are replaced with waxed sash cord matched to the original weight-and-pulley system, not cut down to a cheaper synthetic cord that stretches and needs redoing within a couple of years.Draught-proofing uses routed-in brush pile seals in the staff bead and parting bead, not surface-mounted foam strips that get painted over and stop sealing within a season.Regular coverage of Bromley and the wider South East London area
Signs to look for
Do you need sash windows & joinery in Bromley?
Visible daylight or a draught you can feel around the meeting rail even with the window fully closed and locked.
A sash that drops on its own or won't stay up without a prop, which points to a snapped or stretched cord.
Flaking paint or soft, spongy timber at the sill or bottom rail, especially on a south or west-facing elevation that gets more weather.
A rattling noise in wind, which usually means the sashes have shrunk slightly in their box and need easing or draught-proofing rather than replacing.
How the work is handled in Bromley
Step 1Survey each window, door or staircase element individually rather than quoting a blanket per-item price.
Step 2Test sash mechanisms, probe timber for rot, and check staircase fixings from underneath where access allows.
Step 3Confirm conservation area status, Article 4 directions and, for flats, whether freeholder consent is needed before agreeing scope.
Step 4Provide a written, itemised quote broken down by window, door or staircase element and repair type.
Step 5Order matched materials, waxed sash cord, brush-pile seals, period door profiles or matched skirting, ahead of the site visit.
Step 6Carry out repairs in the sequence that suits the wider project, windows and staircases before final decoration, doors after flooring.
Step 7Splice in new timber where rot is found rather than filling over it, then prime and undercoat before final paint.
Step 8Test every sash, door and stair fixing on completion before calling the job finished.
Step 9Leave the property clean, with offcuts and old materials removed, and photograph completed work for your records.
Questions
Sash Windows & Joinery questions in Bromley
How quickly can Lian start sash window repair and restoration plus internal doors, staircases and period joinery in Bromley?
Bromley is part of our regular South East London coverage, so once we've surveyed the property we can usually confirm a start date quickly. Send the address and scope and we'll arrange the next step.
Do you cover all of Bromley?
Yes. Bromley falls within the area Lian Construction serves across Greater London.
Do older Bromley properties need different repair approaches than newer builds?
Often, yes. Period houses were built with different materials and construction methods than modern homes, so repairs need to account for things like solid wall construction, original roofing materials, and older guttering systems that were not designed to modern standards. Using mismatched modern materials on an older property can sometimes cause more problems than it solves, so it is worth working with someone who has handled similar-age housing before, particularly for roofing and brickwork.
Is secondary glazing a good alternative to replacing my sash windows?
Yes, for most conservation area properties it's the more practical and more readily approved route to better insulation and noise reduction, since it doesn't alter the original sash at all. It typically costs £350–£600 per window supplied and fitted. We cover secondary glazing in more detail on our <a href='/eco-retrofit-refurbishment-london'>eco retrofit and secondary glazing page</a> rather than duplicating that here.
Do I need planning permission to repair my sash windows?
Like-for-like repair, draught-proofing and re-glazing generally don't need planning permission because you're not changing the external appearance or the opening. Full replacement is more likely to need consent, particularly on a flat, which has no permitted development rights of its own, or on a conservation area house where an Article 4 direction applies.
How much does it cost to supply and fit an internal door in London?
A standard flush internal door supplied and fitted, including lining and architrave, typically costs £250–£450 in London. A period-matched four-panel door built or sourced to suit a Victorian or Edwardian house, which usually needs a better grade of timber and more careful fitting to an older, often slightly out-of-square opening, runs £350–£650.
Talk to Lian Construction about Bromley
Send the site address in Bromley, photos if available, and the sash windows & joinery work you need. We can review the scope and arrange the next step.