Greater London · England
Window & door mastic in Richmond upon Thames, Greater London
Mastic around window and door frames, sills and patio doors in Richmond upon Thames, with a 12-month guarantee on every job. Ask us for a quote.
- A bead that doesn’t match the frame
- Draughts coming in around windows and doors
- Rain getting in at the frame or under the sill
The process
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes most of a day for a typical house, less for a few frames. In Richmond upon Thames, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
- Move anything stored near the joints
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
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About our window mastic in Richmond upon Thames
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. Typical jobs include gaps between the frame and the inside reveal and black, perished sealant on frames, across composite doors, window sills and timber windows & doors.
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 Richmond upon Thames.
Your job is guaranteed for a year, as with all our work.
- Where
- Richmond upon Thames (TW9, TW10, SW14, TW1)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Richmond upon Thames
More services for Richmond upon Thames
For landlords and businesses
If you manage several properties in or around Richmond upon Thames, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Common questions in Richmond upon Thames
Is parking a problem for a job in Richmond 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 Richmond upon Thames?
Yes. We work across London and the South East, and Richmond upon Thames is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access.
How much does window mastic cost in Richmond upon Thames?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Can you match the sealant to my frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Do you do commercial work?
Yes. We can plan bigger jobs in stages to suit the site.
Will resealing my frames help with draughts?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
How the job changes by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
uPVC windows
The frame is cleaned with a product that will not harm the plastic, then the sealant goes in between frame and wall and tooled smooth.
When something else is needed
In fairness, some problems need a different trade:
- Condensation trapped between the panes
- Damp coming through the wall itself rather than the frame joint
- Broken hinges, locks or handles
If in doubt, call 0345 464 0079 or email us and we will say what we think.
What we seal
- Composite doors
- Aluminium frames
- Patio & French doors
- uPVC windows
- Window sills
- Timber windows & doors
Windows and doors in Richmond upon Thames
Historic houses like Pembroke Lodge (about 1.3 miles south) are a reminder that the area around Richmond upon Thames 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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
For site and facilities teams at buildings such as Marshgate Primary School, larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around Holy Trinity Richmond, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Richmond upon Thames is about 3 miles south of Ealing, in Greater London. Wherever you are in the TW9 postcode area, our applicators can take on window mastic. Richmond upon Thames is one of 764 towns and villages in Greater London where we work for window mastic. For nearby work, see our London page, about 9 miles away.
Every address in TW9, TW10, SW14 and TW1 is within our area for window mastic. We cover properties on Church Road, King George Square and Topiary Square and the roads around them. You will find Richmond upon Thames on the B321 and B322, so it’s easy for us to get to with everything needed for window mastic. We also cover North Sheen (1 mile north-east), East Sheen (1 mile east), Mortlake (1 mile east), Kew (2 miles north-east) and Strand-on-the-Green (2 miles north-east). We also work in nearby towns such as London (9 miles east), City of Westminster (7 miles north-east), Marylebone (8 miles north-east), Kensington (5 miles north-east), St Pancras (9 miles north-east) and Shoreditch (10 miles north-east).
What’s near Richmond upon Thames
Locally, jobs take us to homes and businesses close to Pesthouse Common, The White Horse Richmond pub and Kneller Hall Junior School and the streets around them. Richmond upon Thames has its own railway station: Richmond station. A little further out are Eel Pie Island Museum (1.5 miles south-west) and Treaty Centre (3 miles west). Not far away are Duke's Hollow and Richmond Hill.
What we’re called out for in Richmond upon Thames
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
The most common problems we see are:
- Cracked internal joints between frame and plaster
- Draughts coming in around windows and doors
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
Richmond upon Thames is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Before you book anyone
- Whether the sealant suits the joint
- How hidden problems are handled
- Whether they’re fully insured
- Whether you can choose the colour
What affects the quote in Richmond upon Thames
We quote each job individually. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
- How many rooms, windows or areas are involved
- Any working-time requirements on site
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
To help us quote quickly, let us know:
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
- How we’d reach the joints
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job.