Greater London · England
Alperton Window Mastic
Window mastic in Alperton from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
- White mastic on grey or black frames
What we do, step by step
We keep the work tidy and contained to the area we are working on, so you can get on with your day. Expect the work to take most of a day for a typical house, less for a few frames, and we tell you how long to leave it before we go. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Alperton. It helps if you can point us to a visitor permit or a bay close to the door.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Related advice
About our window mastic in Alperton
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. If you have mastic that has split away from the wall and mastic that’s falling out in pieces, we can help, whatever the surface.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking.
Every job comes with a one-year guarantee.
- Location
- Alperton (HA0, UB6, NW10)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Alperton homes and the weather
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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Wembley Central station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as Alperton Community School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Alperton is about 2 miles north of Ealing, in Greater London. Every kind of property in Alperton can book us for window mastic, old or new, large or small. Every job comes with our one-year guarantee. Alperton is one of 764 places in Greater London we cover for window mastic. Our London page covers work nearby, about 9 miles away.
We work across HA0, UB6 and NW10 for window mastic. Streets in the area include Lee Road, Marsh Road and Eagle Road. Neighbouring places we cover for window mastic include West Twyford (1 mile south-east), Tokyngton (1 mile north-east), Mapesbury (1 mile north-east), Stonebridge Park (1 mile east) and Park Royal (1 mile south-east). Within a short drive, we also cover London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (5 miles south-east), St Pancras (8 miles east) and Shoreditch (10 miles east).
Around Alperton
Around Alperton, our work takes us to homes and buildings near Brentham Clubhouse pub, Perivale Primary School and St. Raphael's Edible Garden. Alperton’s nearest station is Wembley Central station, roughly 0.8 miles north of the centre. Well-known places in the area include London Transport Museum Depot (2.6 miles south) and London Designer Outlet (1.3 miles north-east). The countryside around Alperton includes Castlebar Hill and Fox Wood.
Should I try it myself first?
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.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
How the job changes by surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones aren’t used, as they can attack some metals. We use a neutral-cure product.
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the new bead is laid against the frame and the wall.
For landlords and businesses
Letting agents and landlords in Alperton can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Also near Alperton
Other services in Alperton
Why deal with it now?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone are not designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Alperton, the repair is bigger than a sealant job.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first.
Why Alperton customers choose us
- 20+ years of sealant experience
- Experience in homes, commercial sites and hotels
- Arbo and Everbuild products
- Old sealant always removed completely
See our cost guide and our reviews.
Alperton: your questions answered
Is parking an issue for window mastic in Alperton?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you work for landlords with property near Wembley Central station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Do you guarantee window mastic?
Yes, with our 12-month guarantee. A yearly look at the joints helps them last.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Avoid blasting the frames with a pressure washer
- Wash the frames with mild soapy water
- Keep solvents and bleach off the sealant
- Keep paint and stain on wooden frames in good order
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak, and if anything looks wrong, just call 0345 464 0079 or drop us an email.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
What we are called out for in Alperton
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Any of these means the joints need attention:
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
- Draughts coming in around windows and doors
- A bead that does not match the frame
Alperton is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Is VAT in the price?
- What happens if they find a problem under the old sealant
- Is the old sealant removed completely?
- What the cure time is