Greater London · England
Brentham Garden Suburb Window Mastic
Professional window mastic in and around Brentham Garden Suburb, with every bit of old sealant taken out first and a one-year guarantee.
- A bead that does not match the frame
- Rushed sealant from a window installation
- Draughty joints inside around the window
Questions from Brentham Garden Suburb
Is Brentham Garden Suburb in your area for window mastic?
Yes. Our work covers London and the South East, and Brentham Garden Suburb is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Is parking an issue for window mastic in Brentham Garden Suburb?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected.
What does window mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
About our window mastic in Brentham Garden Suburb
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. If you have hard, cracked sealant around windows and a bead that doesn’t match the frame, we can help, whatever the surface.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Where
- Brentham Garden Suburb (W5, W13, UB6)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What window mastic looks like in Brentham Garden Suburb
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. With historic houses such as Pitzhanger Manor (about 1.1 miles south) nearby, there’s older building stock in the area around Brentham Garden Suburb as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Barnabas, the joint between an old wall and a newer frame is generally the first place rain gets in. Brentham Garden Suburb is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Brentham Garden Suburb is about 1 mile north of Ealing, in Greater London. Every kind of property in Brentham Garden Suburb is covered for window mastic. The work is guaranteed for a year. Across Greater London, we cover 764 places, Brentham Garden Suburb among them. For nearby work, see our London page (9 miles or so).
Work in W5, W13 and UB6 is quoted and booked the same way as anywhere else. We cover properties on Kings Road, Selby Road and Marsh Road. Close by, we work in Pitshanger (1 mile west), Perivale (1 mile north-west), Ealing (1 mile south), Hanwell (2 miles south-west) and South Ealing (2 miles south). Larger places within reach include London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (5 miles east), St Pancras (8 miles east) and Shoreditch (10 miles east).
Landmarks near Brentham Garden Suburb
Around Brentham Garden Suburb, our work takes us to homes and buildings near Ealing Independent College, Library for Iranian Studies and St Benedict's School. Nearby too are Castle Bar Park (1 mile west) and Brentham Clubhouse pub (within half a mile north-west). For rail, the closest station is Ealing Broadway station, roughly 0.9 miles south. Nearby you will also find London Transport Museum Depot (1.9 miles south-east) and Central Middlesex Hospital (1.7 miles east). Green spaces nearby include Castlebar Hill and Middle Lake.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Keep drainage slots and sill grooves clear
- Avoid harsh chemicals near the mastic
- Wash the frames with mild soapy water
- Keep paint off silicone joints
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
Why it’s worth doing now in Brentham Garden Suburb
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Brentham Garden Suburb, the repair is bigger than a sealant job.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why us?
- A choice of colours where the product allows
- We never seal over old sealant
- Every job guaranteed for a year
- Tidy, careful work
See our cost guide and our reviews.
What we cannot put right
Before you book, it’s worth knowing the limits:
- Rotten timber, which needs a joiner first
- A sash or casement that won’t close properly
- Condensation trapped between the panes
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Timber windows & doors
- Composite doors
- uPVC windows
- Aluminium frames
- Patio & French doors
- Window sills
Also near Brentham Garden Suburb
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What the job involves on each surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that, where a rigid one would crack.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match keeps the clean look.
How it works
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take most of a day for a typical house, less for a few frames, and we tell you how long to leave it before we go. In a London area like Brentham Garden Suburb, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- 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
- Keep children and pets away from the work area
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
How to get a quote
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job, and pictures are welcome.
Read more
How we quote for window mastic
The quote reflects the job in front of us. We take into account:
- Whether the work is at height
- When we can work, for business premises
- How much there is to do
- Whether there’s mould to deal with
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
To help us quote quickly, please include:
- Where the property is
- How we’d reach the joints
- The type of property
- Pictures of the joints, sent by email
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work and send you a clear quote.
Common problems we fix in Brentham Garden Suburb
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, and it lets go sooner than it should.
People usually contact us after spotting one of these:
- Sealant in the wrong colour for the frame
- Water coming in at the bottom corners of a door
- Mastic that has split away from the wall
- Cold air getting in at the frame edge
If you look after a building such as St Gregory's Catholic Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- How the joint is cleaned and prepared
- How hidden problems are handled
- Whether the sealant suits the joint
- The length of the guarantee