Greater London · England
Window & door mastic in Anerley, Greater London
Mastic around window and door frames, sills and patio doors for homes and businesses in Anerley and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Hard, cracked sealant around windows
- Cracked internal joints between frame and plaster
- Gaps left after new windows were fitted
What we do, step by step
We bring everything the job needs with us, so you don’t need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from an hour or two to a full day, depending on how many frames there are. In Anerley, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Mention any leaks or damp you’ve noticed
How to get a quote
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Advice
Window mastic in Anerley
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on patio & French doors, aluminium frames and timber windows & doors, and people most often call us about cold air getting in at the frame edge and mastic that has split away from the wall.
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 Anerley is something to talk through when you book.
A one-year guarantee comes as standard.
- Where
- Anerley (SE20, SE19, SE26)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Other services in Anerley
What we’re called out for in Anerley
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
These are the problems we’re asked about most:
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
- Leaking joints at the ends of sills
Homes close to St Paul's include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
Comparing quotes
- Who turns up on the day
- Whether the sealant suits the joint
- Whether you can choose the colour
- How long to leave it before use
What sealant work cannot fix
In fairness, some problems need a different trade:
- Penetrating damp from a failed cavity tray or render
- A door that needs adjusting, rehanging or new seals
- A failed sealed unit that has misted up
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
What we seal
- Window sills
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- uPVC windows
- Composite doors
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What window mastic looks like in Anerley
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as James Dixon Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Anerley station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Anerley is about 2 miles north-east of Thornton Heath, in Greater London. Homes, rented property, offices and hotels in Anerley can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Greater London, we cover 764 places, and Anerley is one of them. We also work in London, about 6 miles from Anerley.
Every address in SE20, SE19 and SE26 is covered for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on Maple Road, Padua Road and Genoa Road or a nearby road, we can help. Close by, we work in Penge (1 mile east), Crystal Palace (1 mile north), Sydenham (1 mile north-east), Gipsy Hill (1 mile north-west) and Upper Norwood (1 mile west). Further out, we also cover London (6 miles north), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).
Local landmarks in Anerley
Locally, jobs take us to homes and businesses close to Crystal Palace School, Crystal Palace Dinosaurs and Harris City Academy Crystal Palace, among other places. Anerley has its own railway station: Anerley station. A little further out are Crystal Palace Museum (0.5 miles north-west) and Whitgift Centre (3.1 miles south-west). The countryside around Anerley includes Dulwich Upper Wood and Knight's Hill.
Your questions about window mastic in Anerley
Is Anerley in your area for window mastic?
Yes, Anerley is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Is parking an issue for window mastic in Anerley?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Are you insured?
Yes. We are fully insured, with over 20 years’ experience in sealant work.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can I paint over the new sealant?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Can I add another job to the visit?
Yes. Just list everything you need and we will quote it together.
Can you seal the gap between the frame and the plaster indoors?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
How the job changes by surface
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it.
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so a flexible sealant is essential. The paint or stain needs to be sound where the sealant meets it.
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why Anerley customers choose us
- Trusted Arbo and Everbuild sealants
- We leave the area clean and tidy
- Homes, businesses and hotels
- More than 20 years in sealant work
See what affects the cost and our reviews.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether there’s mould to deal with
- How much there is to do
- Whether the work is at height
- Working hours on commercial sites
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Helping us quote
To help us quote quickly, let us know:
- Any access issues, like height or stairs
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.