Slough · England
Colnbrook Window Mastic
Professional window mastic in and around Colnbrook, with old sealant always removed completely and a 12-month guarantee.
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
- Rushed sealant from a window installation
FAQs for Colnbrook
Will you come out to Colnbrook?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Colnbrook for window mastic?
Yes, Colnbrook is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
How do I get a quote for window mastic in Colnbrook?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
Will new mastic stop draughts?
In many cases. Air often gets in between the frame and the wall, and sealing the inside and outside joints closes that path.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Can I paint over the new sealant?
It depends on the sealant. Some hybrid sealants can be painted; silicone can’t. Mention any painting plans before any work starts.
Will there be a smell?
Possibly a little. It fades as the sealant cures.
How we handle window mastic in Colnbrook
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on window sills, composite doors and uPVC windows, and common reasons people get in touch are draughty joints inside around the window and cold air getting in at the frame edge.
Somewhere as small as Colnbrook, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Colnbrook (SL3)
- Wider area
- Slough
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Colnbrook
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Towns and villages near Colnbrook
What else we do in Colnbrook
Quotes for window mastic in Colnbrook
We quote each job individually. This is what makes a difference:
- Mould in or behind the old joints
- The number and length of the joints
- How easy the joints are to reach
- The number of rooms or windows
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
What to tell us when you ask for a quote:
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- If someone has resealed it before
- Where the property is
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or send us an email.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
When to call us in Colnbrook
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Look out for any of the following:
- Draughts coming in around windows and doors
- Black, perished sealant on frames
- Draughty joints inside around the window
- Rain getting in at the frame or under the sill
Homes close to Church of St Thomas include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
- Whether all the old sealant comes out first
- Is VAT in the price?
What window mastic looks like in Colnbrook
Historic houses like Frogmore House (about 3 miles west) are a reminder that the area around Colnbrook has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Sunnymeads station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you look after a building such as Colnbrook Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Colnbrook is about 4 miles north of Staines-upon-Thames, in Slough. Wherever you are in the SL3 postcode area, we cover window mastic for homes and businesses. Our area takes in 31 places across Slough, large and small. London is on our list too, about 19 miles from Colnbrook.
Work in SL3 is quoted and booked the same way as anywhere else. If you need window mastic at a property on High Street, Rayners Close and Drift Way or anywhere close by, we can help. Neighbouring places we cover for window mastic include Poyle (1 mile south-east), Brands Hill (1 mile west), Horton (1 mile south-west), Stanwell Moor (2 miles south-east) and Ditton (2 miles west). Larger places within reach include Slough (4 miles north-west), Cippenham (5 miles north-west), Chalvey (4 miles north-west), Britwell (5 miles north-west), Upton (3 miles north-west) and Burnham (7 miles north-west).
Landmarks near Colnbrook
We work in homes and buildings around Arthur Jacob Nature Reserve, The Red Lion Public House and Langley Grammar School and the streets around them. Colnbrook’s nearest station is Sunnymeads station, roughly 1.7 miles south-west of the centre. A little further out are Windsor Castle (3.4 miles west) and Upton Hospital (3.2 miles north-west). Not far away are Uxbridge Moor and Staines Reservoirs.
Why it’s worth doing now in Colnbrook
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished. Where a wall is exposed, as many are in small places like Colnbrook, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Full insurance on every job
- Old sealant always removed completely
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
The process
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a morning for a couple of windows and a door, including the tidy-up. Somewhere as small as Colnbrook, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any tricky access
- Let us know about earlier repairs to the joints
Getting a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Read more
Different surfaces, different methods
uPVC windows
uPVC expands and contracts noticeably with temperature, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We’ll point out any rot we find, as that is a job for a joiner.