Greater London · England
Window & door mastic in South Kenton, Greater London
We cover South Kenton for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Draughts coming in around windows and doors
- White mastic on grey or black frames
- Water coming in at the bottom corners of a door
Window mastic in South Kenton: local notes
Historic houses like Headstone Manor (about 2.6 miles north-west) are a reminder that the area around South Kenton has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near South Kenton station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as Byron Court Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
South Kenton is about 1 mile north-west of Wembley, in Greater London. Across the HA9 area, our applicators can take on window mastic. South Kenton is one of 764 towns and villages in Greater London we cover. There’s also a page for London, about 10 miles away.
We work across the HA9, HA0 and HA3 postcode area for window mastic. That includes homes and businesses on Peel Road, Holt Road and Byron Road and the roads around them. Other places close to South Kenton include Northwick Park (1 mile west), Kenton (1 mile north), North Wembley (1 mile south), Brondesbury Park (1 mile south) and Harrow on the Hill (1 mile west). Within a short drive, we also cover London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (7 miles south-east), St Pancras (9 miles east) and Shoreditch (10 miles east).
What’s near South Kenton
In South Kenton, that means homes and buildings near Windermere pub, Preston Park and Wembley High Technology College, among other places. South Kenton has its own railway station: South Kenton station. Other landmarks nearby include St. Mark's Hospital (0.6 miles north-west) and Kodak Museum (2.2 miles north-west). Open spaces near South Kenton include Castlebar Hill and Masons Field.
Window mastic in South Kenton
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you’re dealing with cracked sealant at the sill ends and untidy mastic left by window fitters, we can put it right.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in South Kenton.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- South Kenton (HA9, HA0, HA3)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need window mastic in South Kenton
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.
The problems people normally mention when they call are:
- Untidy mastic left by window fitters
- Damp patches on the reveal after heavy rain
- Cracked internal joints between frame and plaster
- Black, perished sealant on frames
In the older streets around Church of the Annunciation, the joint between an old wall and a newer frame is generally the first place rain gets in.
What to look for in a quote
- Is VAT in the price?
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
Looking after it afterwards
So the new joints stay in good condition:
- Keep jet washers away from the mastic
- Look round the frames every year or so
- Don’t use solvent cleaners on the joint
- Make sure the drainage slots are not blocked
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Nearby places to South Kenton
Other services in South Kenton
Why act early in South Kenton
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in South Kenton, the repair is bigger than a sealant job.
Combining jobs into one visit is generally more efficient than separate visits. We’ll give you a clear quote for the lot.
Why us?
- 20+ years of sealant experience
- Old sealant always removed completely
- Quality sealants from Arbo and Everbuild
- Approved under the ARBOMaster scheme
See our cost guide or customer reviews.
Different surfaces, different methods
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We’ll point out any rot we find, as a joiner will need to deal with it.
Composite doors
Draughts round the door leaf normally come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Access and height
- Any mould that needs treating
- The number and length of the joints
- Which sealant suits the joint
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
Asking for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- How many joints, rooms or windows are involved
- The address or postcode of the job
- Photos by email, if that is easy
- What the problem is, such as mould, gaps, leaks or cracking
Need a quote? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a handful of frames, longer for a whole house. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in South Kenton. 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.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- 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.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- Let us know if you’ve seen damp or leaks
How to get a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand.
Related advice
When something else is needed
New sealant can’t fix everything, and we’ll tell you before work begins. Sealant won’t put right:
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
- Soft or decayed wood in the frame
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
Where we work in South Kenton
- Patio & French doors
- Aluminium frames
- uPVC windows
- Timber windows & doors
- Composite doors
- Window sills
Common questions in South Kenton
Is parking an issue for window mastic in South Kenton?
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.
Do you cover South Kenton for window mastic?
Yes. We work across London and the South East, and South Kenton is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Is the new sealant paintable?
Silicone generally won’t take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where are you based?
We work from Crawley. Our applicators cover South Kenton, along with the rest of our area.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. You’ll know the timing when we quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.