Greater London · England
Window & door mastic in Westbourne, Greater London
Professional window mastic in and around Westbourne, with every bit of old sealant taken out first and a 12-month guarantee.
- A bead that doesn’t match the frame
- Mastic that’s falling out in pieces
- Untidy mastic left by window fitters
Window mastic in Westbourne
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the line suits the frame instead of standing out. We work on aluminium frames, timber windows & doors and window sills, and people most often call us about cold air getting in at the frame edge and draughty joints inside around the window.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking.
Every job comes with a one-year guarantee, wherever you are in Greater London.
- Where
- Westbourne (W2, W11, W9)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
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, then guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
What happens on the day
We bring everything the job needs with us. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a few frames, or a day or more for a whole house. For a job in Westbourne, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Clear the area around the work
- Mention if the joints have been sealed before
- Keep pets and children clear of the area while we work
Getting a quote
We quote each job on its own. Just ring 0345 464 0079 or email us with the details.
Related advice
Different surfaces, different methods
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. If we find rot, we’ll tell you before going ahead, as that’s a job for a joiner.
What affects the quote in Westbourne
The price is agreed before any work begins. It’s based on:
- Whether there’s mould to deal with
- Whether the work is at height
- The size of the job
- Which sealant suits the joint
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Asking for a quote
To help us quote quickly, please include:
- How we’d reach the joints
- The address or postcode of the job
- Pictures of the joints, sent by email
- The type of property
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Westbourne homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as St. Mary of the Angels Catholic Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to London Paddington station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Westbourne is about 1 mile north of Kensington, in Greater London. If you need window mastic in Westbourne, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base, Westbourne included. 764 places in Greater London are on our list, from the larger towns to small villages.
Jobs for window mastic in W2, W11 and W9 is quoted and booked the same way as anywhere else. We cover properties on Salem Road, Acklam Road and Morgan Road. Being close to the A404 and A4206, Westbourne is easy for our applicators to reach for window mastic. If you’re just outside Westbourne, we cover Westbourne Green (1 mile north-east), Bayswater (1 mile south), Little Venice (1 mile north-east), Maida Vale (1 mile north) and Paddington Green (1 mile east). Further out, we also cover London (5 miles east), St Pancras (3 miles east), Shoreditch (5 miles east), Walthamstow (9 miles north-east), Hoxton (5 miles east) and Whitechapel (5 miles east).
Around Westbourne
Locally, jobs take us to homes and businesses close to Maida Vale School, Abdus Salam Library and Westminster Academy and the streets around them. You will also find Emslie Horniman's Pleasance (0.8 miles north-west) and Cock and Bottle pub (within half a mile south-west). For rail, the closest station is London Paddington station, roughly 0.8 miles east. A little further out are Paddington General Hospital (0.5 miles north) and Greek Orthodox Cathedral Treasury Museum (less than half a mile south-east). For a walk, there’s Campden Hill and Greville Place nature reserve.
When to call us in Westbourne
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
The problems people generally mention when they call are:
- Damp patches on the reveal after heavy rain
- Gaps left after new windows were fitted
- Leaking joints at the ends of sills
- Draughts coming in around windows and doors
For an older house near a landmark such as St Stephen's Church, the joint between an old wall and a newer frame is normally the first place rain gets in.
What to look for in a quote
- What product goes in the joint
- What happens if they find a problem under the old sealant
- Whether they seal over old material or remove it
- How the colour is chosen
FAQs for Westbourne
Do you cover Westbourne for window mastic?
Yes. Our work covers London and the South East, and Westbourne is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Is parking an issue for window mastic in Westbourne?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
Can I paint over the new sealant?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Are you fully insured?
Yes. We are fully insured.
Where are you based?
We work from Crawley. Our applicators cover Westbourne, along with the rest of our area.
Do you have sealant for grey or black windows?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Why deal with it now?
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Westbourne, the repair is bigger than a sealant job.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Westbourne
- An ARBOMaster approved applicator
- White, clear, grey or another colour, product permitting
- A sealant colour to suit the surroundings
- Neat joints and a tidy finish
Take a look at our cost guide and our reviews.
Also near Westbourne
What else we do in Westbourne
Honest limits
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Draughts through the window seals rather than the frame
- A failed sealed unit that has misted up
- A sash or casement that will not close properly
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Window sills
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Composite doors
- uPVC windows