Greater London · England
Window & door mastic in Bromley, Greater London
Our applicators work in Bromley on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- Cold air getting in at the frame edge
- Leaking joints at the ends of sills
- Black, perished sealant on frames
Why it’s worth doing now in Bromley
A quick bead over the top of old mastic looks like an easy fix, but new sealant can’t bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Bromley, the repair is bigger than the sealant job would have been.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why book with us
- Tidy, careful work
- Colour agreed with you before any work starts
- ARBOMaster approved applicator
- Homes, businesses and hotels
See what affects the cost and our reviews.
Window mastic for homes and businesses in Bromley
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. If you are dealing with draughty joints inside around the window and gaps left after new windows were fitted, we can help, whatever the surface.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first.
Each job carries a 12-month guarantee.
- Where
- Bromley (BR2, BR1, BR6, BR5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and tidy away. Most jobs take a few hours for a few frames, or a day or more for a whole house. For a job in Bromley, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Related advice
When something else is needed
A few problems are outside what sealant work can do:
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Timber windows & doors
- Patio & French doors
- Composite doors
- Aluminium frames
- uPVC windows
- Window sills
Surface by surface
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
What else we do in Bromley
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Do not paint over the silicone
- Don’t aim a pressure washer at the joints
- Walk round the house once a year and look at the joints
- Ventilate rooms so frames don’t stay wet inside
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
Leaks generally show up in wet, windy weather, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
Common problems we fix in Bromley
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, while a joint packed solid can’t stretch. That’s what backing rod is for.
Look out for these signs:
- Leaking joints at the ends of sills
- Untidy mastic left by window fitters
- Draughty joints inside around the window
- A bead that doesn’t match the frame
Bromley is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before you book anyone
- Whether they’re fully insured
- Who does the work, and how experienced they are
- How long the guarantee is
- How the colour is chosen
Questions from Bromley
Do you work for landlords with property near Bromley South station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Can you do window mastic in Bromley?
Yes, Bromley is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
What does window mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or email us with a short description of the job.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Where do you work from?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch so we can plan the job.
Window mastic in Bromley: local notes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Bromley South station? Then renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as St Mark's Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Bromley is about 8 miles south-east of London, in Greater London. We carry out window mastic for homes and businesses in Bromley and nearby, as part of our work across Greater London. Bromley is one of 764 places in Greater London where we work. There’s also a page for London, about 8 miles away.
Jobs for window mastic in BR2, BR1, BR6 and BR5 works the same way as everywhere else we cover. If you need window mastic at a property on High Street, Church Road and St Paul's Square or a nearby road, our applicators can take on the job. You will find Bromley on the A222 and A223, which makes it straightforward to reach. Other places close to Bromley include Sundridge (1 mile north-east), Plaistow (1 mile north), Bickley (1 mile east), Widmore (1 mile east) and Downham (2 miles north). We also work in nearby towns such as London (8 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (12 miles north-west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Landmarks near Bromley
Locally, jobs take us to homes and businesses close to Bullers Wood School for Boys, The Richmal Crompton pub and Church House Gardens and the streets around them. Bromley has its own railway station: Bromley South station. Other landmarks nearby include The Mall (under half a mile east) and Bromley Hospital (less than half a mile south-east). The countryside around Bromley includes Downham Woodland Walk and Summer Hill.