Greater London · England
Window Mastic in Sipson
Window mastic for Sipson, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Untidy mastic left by window fitters
- Cracked internal joints between frame and plaster
- White mastic on grey or black frames
About our window mastic in Sipson
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. Just phone 0345 464 0079 or email us and tell us how many frames there are and how they’re reached for window mastic in Sipson. If you have draughty joints inside around the window and cracked or shrunken mastic around the frame, we can put it right, whatever the surface.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Sipson (UB7, UB3)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
When it is not the sealant
In fairness, there are a few things sealant won’t fix:
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
- Draughts through the window seals rather than the frame
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly before booking.
Surfaces we seal
- Window sills
- Patio & French doors
- Timber windows & doors
- uPVC windows
- Composite doors
- Aluminium frames
What affects the cost of window mastic
Every job gets its own quote. This is what makes a difference:
- Which sealant suits the joint
- Access and height
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and send you a clear quote before work begins.
Helping us quote
To make quoting easier, let us know:
- A few pictures by email, if you can
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or drop us an email.
Do you need window mastic in Sipson?
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
Any of these means the joints need attention:
- Gaps where the sill meets the wall
- White mastic on grey or black frames
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
As a London address, Sipson can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- What the quote includes, VAT included or not
- How long to leave it before use
- How the joint is cleaned and prepared
- Whether you can choose the colour
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
Housing providers, facilities teams and property managers book us too in Sipson and across Greater London. We can quote a run of properties together, and we’re fully insured.
How the job changes by surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We’ll tell you which suits your home.
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
Sipson questions
I let a flat near West Drayton station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is parking an issue for window mastic in Sipson?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
Is it worth trying it myself?
It depends on the job. 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.
What does window mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used before we leave.
More services for Sipson
Frames and glazing around Sipson
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. 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.
For site and facilities teams at buildings such as Cherry Lane Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near West Drayton station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Sipson is about 1 mile south-east of West Drayton, in Greater London. Sipson gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 764 places across Greater London, large and small. Our London page covers work nearby (15 miles or so).
We work across UB7 and UB3 for window mastic. Window mastic is available to properties on East Road, Sipson Lane and Sipson Road. We also cover the places around Sipson: Harlington (1 mile south-east), Harmondsworth (1 mile south-west), Heathrow (2 miles south), Cranford (2 miles south-east) and Longford (2 miles south-west). Larger places within reach include London (15 miles east), City of Westminster (13 miles east), Marylebone (13 miles east), Kensington (11 miles east), St Pancras (14 miles east) and Hampstead (12 miles east).
What’s near Sipson
We work in homes and buildings around Lake Farm Country Park, Harlington Community School and The Plough pub and the streets around them. The nearest railway station is West Drayton station, about 1.4 miles north-west of the centre. Nearby you’ll also find The Chimes (3.7 miles north) and Harlington (under half a mile south). The countryside around Sipson includes Northala Fields and Crane Meadows.
What happens on the day
The work is kept neat and contained to the joints we are treating. The job generally takes anything from an hour or two to a full day, depending on how many frames there are. In Sipson, 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 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.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Let us know about parking restrictions
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
Getting a quote
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.