Greater London · England
Window & door mastic in North Sheen, Greater London
Window and door frames in North Sheen need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Damp patches on the reveal after heavy rain
- Gaps where the sill meets the wall
- Rushed sealant from a window installation
Should I try it myself 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.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
About our window mastic in North Sheen
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on aluminium frames, patio & French doors and composite doors, and common reasons people get in touch are a bead that doesn’t match the frame and cold air getting in at the frame edge.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in North Sheen as anywhere.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- North Sheen (TW9, SW14, W4)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
The work is kept neat and contained to the area we’re working on. Expect the work to take a few hours for a handful of frames, longer for a whole house. In a London area like North Sheen, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Clear the area around the work
- Mention any sign-in or site rules at work premises
How to get a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we’ll come back to you with a quote.
Read more
What we cannot put right
In fairness, some problems need a different trade:
- Worn gaskets, brush seals or a door that has dropped
- Broken hinges, locks or handles
- Damp coming through the wall itself rather than the frame joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- uPVC windows
- Window sills
- Aluminium frames
- Patio & French doors
- Composite doors
- Timber windows & doors
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Your questions about window mastic in North Sheen
Is parking an issue for window mastic in North Sheen?
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.
Is North Sheen in your area for window mastic?
Yes, North Sheen is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us.
Can landlords and businesses book you?
Yes, regularly. Several properties can go on one quote, and between tenancies is a good time for the work.
How do I get a quote for window mastic in North Sheen?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
Can I paint over the new sealant?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Can you seal the gap between the frame and the plaster indoors?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Do you need window mastic in North Sheen?
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
Keep an eye out for these signs:
- Whistling draughts around closed windows
- Leaking joints at the ends of sills
- Old mastic that has gone black or come away
- Rushed sealant from a window installation
In the older streets around The Barn Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
- Who turns up on the day
How the job changes by surface
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. The paint or stain needs to be sound where the sealant meets it.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so they get particular care.
Why it’s worth doing now in North Sheen
The work is quick compared with the damage it prevents: it takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. In a flat in North Sheen, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- Over 20 years’ experience
- Arbo and Everbuild products
- You choose the colour before work begins
- Homes, businesses and hotels
Take a look at what affects the cost and customer reviews.
North Sheen homes and the weather
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
For landlords with property near Kew Gardens station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. North Sheen is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
North Sheen is about 3 miles south of Acton, in Greater London. Anywhere in TW9, we can carry out window mastic at your property. Across Greater London, we cover 764 places, North Sheen among them. London is on our list too, about 8 miles from North Sheen.
We work across TW9, SW14 and W4 for window mastic and the streets around it. If you need window mastic at a property on Kent Road, Ibis Lane and The Avenue or a nearby road, our applicators can take on the job. Neighbouring places we cover for window mastic include Kew (1 mile north), Grove Park (1 mile north-east), Strand-on-the-Green (1 mile north), East Sheen (1 mile south-east) and Mortlake (1 mile south-east). Further out, we also cover London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles east).
Landmarks near North Sheen
Locally, jobs take us to homes and businesses close to Kew College Prep, Dukes Meadows and Chiswick School and the streets around them. North Sheen has its own railway station: Kew Gardens station. Nearby you will also find Barnes Hospital (1.1 miles south-east) and Livat Hammersmith (2.5 miles north-east). Not far away are Kew Gardens Lake and Duke's Hollow.