Greater London · England
Window & door mastic in North End, Greater London
Mastic around window and door frames, sills and patio doors in North End, with a one-year guarantee on every job. Call for a quick quote.
- Untidy mastic left by window fitters
- Gaps where the sill meets the wall
- Old mastic that has gone black or come away
What window mastic looks like in North End
Historic houses like Garden Lodge (about 0.4 miles north-east) are a reminder that the area around North End has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St. Andrew's Fulham Fields, the joint between an old wall and a newer frame is generally the first place rain gets in. For landlords with property near Kensington Olympia station, renewing tired window mastic between tenants heads off draught and damp complaints. For site and facilities teams at buildings such as The Fulham Boys School, its window and door frames need their mastic kept sound, just like a home’s.
North End is about 1 mile south of Kensington, in Greater London. Whether you are in the middle of North End or further out, window mastic is available for homes and businesses alike. North End is one of 764 towns and villages in Greater London where we work.
Here we cover the W14, SW6 and SW5 postcode area for window mastic. Streets in the area include Sun Road, Star Road and Field Road, all of which we cover. Other places close to North End include West Kensington (1 mile east), Brook Green (1 mile north-west), Fulham (1 mile south), Hammersmith (1 mile west) and Brackenbury Village (1 mile north-west). Larger places within reach include London (5 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
Near you in North End
Locally, jobs take us to homes and businesses close to Seven Stars pub, Polish Library POSK in London and Avonmore Primary School. North End’s nearest station is Kensington Olympia station, about 0.5 miles north. A little further out are Hammersmith Broadway (0.7 miles west) and Montfichet's Tower (4.8 miles east). Open spaces near North End include WWT London Wetland Centre and Campden Hill.
Window mastic in North End
The new joint doesn’t have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We are often asked to deal with gaps where the sill meets the wall and cold air getting in at the frame edge, across patio & French doors, window sills and uPVC windows.
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.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- North End (W14, SW6, SW5)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near North End
More services for North End
Different surfaces, different methods
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We will point out any rot we find, as a joiner will need to deal with it.
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. We match the colour to the frame.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Why deal with it now?
Not every sealant suits a window. Interior caulk and bathroom silicone are not made for exterior frame joints. 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 by the time it shows on a wall or ceiling in North End, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why North End customers choose us
- Over 20 years’ experience
- Every job guaranteed for a year
- Arbo and Everbuild products
- White, clear, grey or another colour, product permitting
Read our cost guide and customer reviews.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Clean frames with a soft cloth and soapy water
- Don’t aim a pressure washer at the joints
- Walk round the house once a year and look at the joints
- Air rooms to keep condensation down around windows
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
The process
We bring everything the job needs with us. Once we have agreed what’s being done, we protect the area and start. It normally 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 North End. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Mention if the joints have been sealed before
- Let us know if you’ve seen damp or leaks
- Move anything stored near the joints
Ask for a quote
Want a quote for window mastic? Please call 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Landlord and commercial work in North End
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
North End: your questions answered
Do you work for landlords with property near Kensington Olympia station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Is parking an issue for window mastic in North End?
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 seal inside as well as outside?
Yes. Inside, the joint between frame and plaster is sealed neatly.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do you come to North End?
Yes. We’re based in Crawley and work across South East England, London and Scotland, and that includes North End.
Will the old sealant be removed?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
How long does it take to reseal the windows on a house?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
What affects the quote in North End
The price is agreed before any work begins. It takes into account:
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- The product the joint needs
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- The type of property
- Any previous sealing or DIY work
- The rough size of the job
- Pictures of the joints, sent by email
If you’re in North End and need window mastic, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.