Greater London · England
Westcombe Park Window Mastic
We cover Westcombe Park for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- Cracked or shrunken mastic around the frame
- Gaps left after new windows were fitted
- Whistling draughts around closed windows
Window mastic for homes and businesses in Westcombe Park
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that can’t flex, so deep gaps get backing rod first. The sealant then grips the two sides it should. If you are dealing with leaking joints at the ends of sills and whistling draughts around closed windows, we can put it right, on uPVC windows, window sills and composite doors alike.
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, and access in Westcombe Park is something to talk through when you book.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Place
- Westcombe Park (SE10, SE7, SE3)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Penetrating damp from a failed cavity tray or render
- A frame that has rotted at the joint
- Draughts through the window seals rather than the frame
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Patio & French doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Timber windows & doors
Why act early in Westcombe Park
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. In a flat in Westcombe Park, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why Westcombe Park customers choose us
- Fully insured
- Approved under the ARBOMaster scheme
- We leave the area clean and tidy
- Homes, businesses and hotels
See what affects the cost and our reviews.
Common questions in Westcombe Park
Is Westcombe Park in your area for window mastic?
Yes. Our work covers London and the South East, and Westcombe Park is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
Is parking an issue for window mastic in Westcombe Park?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Do you have sealant for grey or black windows?
Usually, yes. Tell us the frame colour when you get in touch and we’ll use the nearest match.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we are using and why.
Do you work for letting agents?
Yes, regularly. Several properties can go on one quote, and between tenancies is a good time for the work.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected.
Westcombe Park homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. With historic houses such as Queen's House (about 1 mile west) nearby, there’s older building stock in the area around Westcombe Park as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you let a flat or house near Westcombe Park station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Homes close to St George's Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Westcombe Park is about 2 miles east of New Cross, in Greater London. Wherever you are in the SE10 postcode area, our applicators can take on window mastic. Our Greater London coverage runs to 764 places, Westcombe Park among them.
Work in SE10, SE7 and SE3 is quoted and booked the same way as anywhere else. That includes homes and businesses on Webb Road, Horn Lane and Hardy Road. If you’re just outside Westcombe Park, we cover Vanbrugh Park Estate (1 mile south-west), Maze Hill (1 mile west), Greenwich (1 mile west), New Charlton (1 mile north-east) and Charlton (1 mile east). Further out, we also cover London (5 miles west), City of Westminster (8 miles west), Marylebone (7 miles west), Kensington (10 miles west), St Pancras (7 miles north-west) and Shoreditch (5 miles north-west).
Local landmarks in Westcombe Park
Locally, jobs take us to homes and businesses close to Blackheath High School, Wildwood Montessori School and East Greenwich Pleasaunce. Westcombe Park has its own railway station: Westcombe Park station. Nearby you’ll also find Greenwich Castle (1 mile south-west) and Charlton Athletic Museum (0.8 miles east). The countryside around Westcombe Park includes Tower Hill and Gilbert's Pit.
Also near Westcombe Park
Also in Westcombe Park
Signs you need window mastic in Westcombe Park
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
Keep an eye out for any of the following:
- A bead that does not match the frame
- Mastic that has split away from the wall
- Mastic that is falling out in pieces
- Damp patches on the reveal after heavy rain
As a London address, Westcombe Park can be tricky for parking: let us know about parking bays, permits or a driveway.
Before you book anyone
- How much experience the applicator has
- How long to leave it before use
- Which colour the sealant will be
- Is the old sealant removed completely?
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from an hour or two to a full day, depending on how many frames there are and we leave things clean and tidy. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Before we arrive
- Mention any parking rules near the property
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
Get a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or send us an email with the details.
Read more
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
We also work for property managers and facilities teams in Westcombe Park and across Greater London. Several sites can go on one quote.
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Make sure the drainage slots aren’t blocked
- Use gentle cleaners on frames and sealant
- Avoid harsh chemicals near the mastic
- Keep jet washers away from the mastic
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.