Greater London · England
Window & door mastic in Twickenham, Greater London
Professional window mastic in and around Twickenham, with old sealant always removed completely and a 12-month guarantee.
- Whistling draughts around closed windows
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
Surface by surface
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
About our window mastic in Twickenham
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. Typical jobs include rain getting in at the frame or under the sill and gaps left after new windows were fitted, across window sills, composite doors and timber windows & doors.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking.
Your job is guaranteed for a year, as with all our work.
- Location
- Twickenham (TW1, TW2, TW4, TW3)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Window mastic in Twickenham: local notes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
If you let a flat or house near Twickenham station, renewing tired window mastic between tenants heads off draught and damp complaints. Richmond House, about 0.5 miles east, is one of the historic houses in the wider area around Twickenham.
Twickenham is about 7 miles south-west of Kensington, in Greater London. Wherever you are in the TW1 postcode area, we can carry out window mastic at your property. Our area takes in 764 places across Greater London, from the larger towns to small villages. We also work in London, around 11 miles away.
Postcode districts we cover here for window mastic: TW1, TW2, TW4 and TW3. If you need window mastic at a property on Station Road, London Road and Talbot Road or anywhere close by, our applicators can take on the job. With the A305 and A310 close by, Twickenham is easy for our applicators to reach for window mastic. Close by, we work in Whitton (1 mile west), Eel Pie Island (1 mile east), Strawberry Hill (1 mile south), Ivybridge (1 mile north) and Fulwell (1 mile south). Within a short drive, we also cover London (11 miles 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).
Near you in Twickenham
Around Twickenham, our work takes us to homes and buildings near Richmond upon Thames School, St Richard Reynolds Catholic High School and Marble Hill Park and the streets around them. Twickenham’s nearest station is Twickenham station, roughly 0.5 miles north-east of the centre. Nearby you’ll also find Eel Pie Island Museum (0.6 miles east) and Treaty Centre (1.8 miles north-west). Green spaces nearby include Richmond Hill and Ham Lands.
The process
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a morning for a couple of windows and a door. In Twickenham, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Preparing for the visit
- On commercial sites, let us know about site rules
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
Getting a quote
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 will have a clear quote before work begins.
Advice
Also near Twickenham
Other services in Twickenham
Twickenham questions
I let a flat near Twickenham station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Is Twickenham in your area for window mastic?
Yes. Our work covers London and the South East, and Twickenham is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we are done.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
How long should I leave it?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
Do you work on first-floor windows?
Yes, in most cases. Access is planned before any work starts, so mention the height and anything in the way.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Landlords and letting agents in Twickenham can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Common problems we fix in Twickenham
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
The most common problems we see are:
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Mastic that’s falling out in pieces
- Whistling draughts around closed windows
As a London address, Twickenham can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Are they insured?
- How the surfaces are prepared before sealing
- What the cure time is
- Who turns up on the day
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
When it is not the sealant
We will always be straight with you, so here’s what sealant cannot fix:
- Worn gaskets, brush seals or a door that has dropped
- A sash or casement that will not close properly
- A failed sealed unit that has misted up
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
What we seal
- Aluminium frames
- Window sills
- uPVC windows
- Composite doors
- Patio & French doors
- Timber windows & doors
What happens if it’s left?
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we’ll say so. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Twickenham, the repair is bigger than a sealant job.
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why Twickenham customers choose us
- A 12-month guarantee on all work
- We are fully insured
- Over 20 years’ experience
- Rated 4.9 stars on Google
Read how sealant jobs are priced and customer reviews.