Greater London · England
Window & door mastic in Brockley, Greater London
Window mastic for Brockley and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Rushed sealant from a window installation
- Cracked internal joints between frame and plaster
- White mastic on grey or black frames
Landlords, agents and businesses in Brockley
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
How we handle window mastic in Brockley
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we will tell you. If you have water coming in at the bottom corners of a door and draughts coming in around windows and doors, we can help.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Brockley as anywhere.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Where
- Brockley (SE4, SE23, SE6)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Brockley
More services for Brockley
Signs you need window mastic in Brockley
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
If you can see any of these, it’s time to have the joints looked at:
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
- Rushed sealant from a window installation
- Cold air getting in at the frame edge
Managing a site like Beecroft Garden Primary? Then the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- What the cure time is
- Whether all the old sealant comes out first
- Is VAT in the price?
- How hidden problems are handled
What affects the cost of window mastic
You’ll get a clear quote before work begins. It’s based on:
- Whether old sealant or filler has to be cut out
- How much there is to do
- The number of rooms or windows
- Working hours on commercial sites
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Asking for a quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- If someone has resealed it before
- Where the job is, and your postcode
- A few photos by email, if you can
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Window mastic in Brockley: local notes
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Crofton Park station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. As a London address, Brockley can be tricky for parking: let us know about parking bays, permits or a driveway.
Brockley is about 1 mile south of New Cross, in Greater London. Homes, rented property, offices and hotels in Brockley is covered for window mastic. Every job comes with our one-year guarantee. We cover 764 towns and villages across Greater London, large and small.
We cover every part of SE4, SE23 and SE6 for window mastic and the streets around it. Whether your property is on Ivy Road, Nash Road and Lindal Road or a nearby road, we can help. We also cover Crofton Park (1 mile south-east), Honor Oak (1 mile west), Ladywell (1 mile east), Forest Hill (1 mile south-west) and Nunhead (1 mile north-west). Further out, we also cover London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (8 miles north-west), St Pancras (6 miles north-west) and Shoreditch (5 miles north).
Around Brockley
In Brockley, that means homes and buildings near Blythe Hill Tavern, Allenby Tutorial Trust and Blythe Hill Fields and the streets around them. There’s a railway station in Brockley itself: Crofton Park station. Nearby you will also find Horniman Museum and Gardens (1.4 miles south-west) and University Hospital Lewisham (0.7 miles east). Green spaces nearby include One Tree Hill and Knight's Hill.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Clear any debris from frame drain holes
- Keep paint and stain on wooden frames in good order
- Avoid harsh chemicals near the mastic
- Wipe condensation off the frames
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
Why it’s worth doing now in Brockley
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It peels before long, and water still gets in behind. The old mastic has to come out. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- White, clear, grey or another colour, product permitting
- Colour agreed with you before any work starts
- We’re fully insured
- Over 20 years’ experience
Take a look at our cost guide and what customers say.
Questions from Brockley
Do you work for landlords with property near Crofton Park station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Is parking a problem for a job in Brockley?
Parking in Brockley, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
How many windows can you do in a day?
It depends on access, the old mastic and the size of the frames. We will tell you how long your job needs when we quote.
How much does window mastic cost in Brockley?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
Will new mastic stop draughts?
It will if the frame joint is the problem. We check where the draught is before we start.
What happens on the day
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours for a few frames, or a day or more for a whole house. In a London area like Brockley, the main things to plan are parking and access: 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.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Keep pets and children clear of the area while we work
- Clear items away from the joints we are working on
Getting a quote
For window mastic in Brockley, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
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What we cannot put right
It helps to know what we can’t do:
- Damp problems in the wall away from the window
- A frame that has rotted at the joint
- Faulty window hardware
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Brockley
- Timber windows & doors
- Patio & French doors
- Window sills
- uPVC windows
- Aluminium frames
- Composite doors