Greater London · England
Window Mastic in Brentford
Window mastic for Brentford and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Cracked internal joints between frame and plaster
- Water coming in at the bottom corners of a door
- Cold air getting in at the frame edge
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
About our window mastic in Brentford
From a single sill to a whole house of windows, you’ll get a clear quote before any work starts. To get one, ring 0345 464 0079 or send us an email with the number of frames and any access details. Typical jobs include leaking joints at the ends of sills and mastic that’s falling out in pieces, across timber windows & doors, window sills and aluminium frames.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
A 12-month guarantee comes as standard.
- Where
- Brentford (TW8, W3, W4, W5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Brentford
If you are painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email.
Why us?
- A sealant colour to suit the surroundings
- ARBOMaster approved applicator
- Every job guaranteed for a year
- Colour agreed with you before any work starts
Read what affects the cost or our reviews.
What affects the quote in Brentford
Every job gets its own quote. These are the things that affect it:
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- How many rooms, windows or areas are involved
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part.
Asking for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Where the property is
- If someone has resealed it before
- The problem you’ve noticed
- How we’d reach the joints
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.
What we’re called out for in Brentford
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. If the sealant can’t stretch, it splits.
If you can see any of these, it’s time to have the joints looked at:
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
- Cracked or shrunken mastic around the frame
- Draughty joints inside around the window
For landlords with property near Brentford station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Questions to ask before booking
- How hidden problems are handled
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
- How the joint is cleaned and prepared
Brentford: your questions answered
Do you work for landlords with property near Brentford station?
Yes. We work for landlords and letting agents as well as householders, and several properties can go on one quote. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Do you cover Brentford for window mastic?
Yes, Brentford is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Will it make a mess?
No. The area is protected while we work and cleaned up afterwards.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or send us an email.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Can you get sealant to suit coloured frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Is the work guaranteed?
Yes. All our work carries a 12-month guarantee, and we are fully insured.
Can you seal the gap between the frame and the plaster indoors?
Yes. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Brentford homes and the weather
Historic houses like Kew Palace (about 0.5 miles south-east) are a reminder that the area around Brentford 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. 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.
For site and facilities teams at buildings such as St Paul's CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s. Brentford is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Brentford is about 2 miles south of Ealing, in Greater London. Our applicators cover window mastic for homes and businesses in Brentford and nearby. Our Greater London coverage runs to 764 places, and Brentford is one of them. You can also see our page for London, about 9 miles away.
Every address in TW8, W3, W4 and W5 is within our area for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on High Street, Market Place and New Road or a nearby road, we can help. Brentford is on the A4 and A315, which makes it straightforward to reach with everything needed for window mastic. We also cover the places around Brentford: Brentford End (1 mile south-west), Northfields (1 mile north-west), Gillette Corner (1 mile west), Isleworth (2 miles south-west) and Spring Grove (2 miles west). We also work in nearby towns such as London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (4 miles east), St Pancras (8 miles east) and Shoreditch (10 miles east).
Local landmarks in Brentford
Around Brentford, our work takes us to homes and buildings near Library for Iranian Studies, Brentford School for Girls and Kew College Prep. You’ll also find The Brook pub (less than half a mile south-west) and Kew Green (0.7 miles south-east). Brentford has its own railway station: Brentford station. Nearby you will also find Treaty Centre (3 miles south-west) and Musical Museum (0.5 miles east). The countryside around Brentford includes Kew Gardens Lake and Long Wood.
What the job involves on each surface
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Places near Brentford
Also in Brentford
How the visit works
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours for a handful of frames, longer for a whole house. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Brentford. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
Getting a quote
For window mastic in Brentford, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
Advice
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- A door that needs adjusting, rehanging or new seals
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Window sills
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- uPVC windows
- Composite doors