Greater London · England
Window Mastic in Kingston upon Thames
Mastic around window and door frames, sills and patio doors in Kingston upon Thames, with a one-year guarantee on every job. Call for a quick quote.
- Mastic that is falling out in pieces
- Hard, cracked sealant around windows
- White mastic on grey or black frames
Frames and glazing around Kingston upon Thames
With historic houses such as Hampton Court Palace (about 1.8 miles south-west) nearby, there’s older building stock in the area around Kingston upon Thames as well as newer homes. 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. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
If you live in an older home near Church of St Luke, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Kingston station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Kingston upon Thames is about 7 miles south-west of Kensington, in Greater London. We provide window mastic to homes and businesses in Kingston upon Thames and nearby, as part of our work across Greater London. 764 places in Greater London are on our list. For nearby work, see our London page, about 11 miles away.
Every address in KT2, KT1 and TW10 is covered for window mastic. That includes homes and businesses on Sigrist Square, Old London Road and London Road. With the B3365 close by, Kingston upon Thames is simple for us to get to. We also cover Norbiton (1 mile east), Coombe (2 miles east), New Malden (2 miles south-east), Coombe Hill (2 miles north-east) and Motspur Park (2 miles east). Further out, we also cover London (11 miles north-east), City of Westminster (9 miles north-east), Marylebone (10 miles north-east), Kensington (7 miles north-east), St Pancras (11 miles north-east) and Shoreditch (12 miles north-east).
What’s near Kingston upon Thames
In Kingston upon Thames, that means homes and buildings near Canbury Gardens, The Grey Horse pub and Kingston Grammar School, among other places. Kingston upon Thames has its own railway station: Kingston station. A little further out are Eel Pie Island Museum (2.6 miles north-west) and Kingston Hospital (0.7 miles east). Green spaces nearby include Rose Walk and Kingston Hill Road area.
How we handle window mastic in Kingston upon Thames
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we’ll say so. If you have gaps where the sill meets the wall and rain getting in at the frame or under the sill, we can put it right.
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, in Kingston upon Thames as anywhere.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Where
- Kingston upon Thames (KT2, KT1, TW10)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Aftercare is simple:
- Clear any debris from frame drain holes
- Walk round the house once a year and look at the joints
- Don’t use solvent cleaners on the joint
- Avoid blasting the frames with a pressure washer
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.
The process
We keep the work tidy and contained to the joints we’re treating. The job usually takes anything from an hour or two to a full day, depending on how many frames there are, and we explain the cure time before we leave. In Kingston upon Thames, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Keep children and pets away from the work area
- Clear items away from the joints we’re working on
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or email us.
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Should I try it myself first?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Your questions about window mastic in Kingston upon Thames
Is parking an issue for window mastic in Kingston upon Thames?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you do window mastic in Kingston upon Thames?
Yes. Our work covers London and the South East, and Kingston upon Thames is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Do you have sealant for grey or black windows?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures.
How much does window mastic cost in Kingston upon Thames?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
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, while a short indoor joint may be within reach.
Can you reach windows above the ground floor?
Yes, in most cases. We plan safe access before the job.
How the job changes by surface
Aluminium frames
Coated aluminium needs a compatible sealant, and acetoxy silicones are not used, as they can attack some metals. We use a neutral-cure product.
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
What affects the cost of window mastic
There’s no set price list, because no two jobs are the same. What we look at:
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Photos by email, if that is easy
- The address or postcode of the job
- The type of property
- Any access issues, like height or stairs
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Landlords and letting agents in Kingston upon Thames can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
When to call us in Kingston upon Thames
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Keep an eye out for these signs:
- Whistling draughts around closed windows
- Draughty joints inside around the window
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
Kingston upon Thames is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Comparing quotes
- Whether they seal over old material or remove it
- Which colour the sealant will be
- What happens if they find a problem under the old sealant
- The length of the guarantee