Buckinghamshire · England
Window & door mastic in Coombe, Buckinghamshire
Problem with your window and door frames in Coombe? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Cracked or shrunken mastic around the frame
- Gaps left after new windows were fitted
- Damp patches on the reveal after heavy rain
Window mastic in Coombe, done properly
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. Common call-outs are for cold air getting in at the frame edge and black, perished sealant on frames, on patio & French doors, window sills and composite doors.
Outdoor sealant needs dry, clean surfaces, so work on frames around Coombe is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Location
- Coombe (HP17)
- Wider area
- Buckinghamshire
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it generally takes most of a day for a typical house, less for a few frames. Somewhere as small as Coombe, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Clear items away from the joints we are working on
- Keep children and pets away from the work area
- Mention any leaks or damp you’ve noticed
Get a quote
Want a quote for window mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Landlords, agents and businesses in Coombe
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Common questions in Coombe
Do you cover Coombe for window mastic?
Yes. We work across London and the South East, and Coombe is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Can you help a landlord with a rental near Little Kimble station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Is the work guaranteed?
Yes. Every job comes with our one-year guarantee, and we’re ARBOMaster approved applicators.
Where are you based?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
Can you get sealant to suit coloured frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames normally suit brown.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
How the job changes by surface
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We will point out any rot we find, as a joiner will need to deal with it.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones are not used, as they can attack some metals. Neutral-cure sealant is the safe choice.
When to call us in Coombe
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Most people get in touch after spotting something like this:
- Water coming in at the bottom corners of a door
- Draughty joints inside around the window
- Leaking joints at the ends of sills
- Draughts coming in around windows and doors
Managing a site like Great Kimble Church of England School? Then the mastic around its windows and doors needs looking after like any other building’s.
Before you book anyone
- How the joint is cleaned and prepared
- What product goes in the joint
- Whether they seal over old material or remove it
- The length of the guarantee
When something else is needed
In fairness, there are a few things sealant will not fix:
- A failed sealed unit that has misted up
- Broken hinges, locks or handles
- Draughts through the window seals rather than the frame
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- uPVC windows
- Patio & French doors
- Aluminium frames
- Timber windows & doors
- Composite doors
- Window sills
Why act early in Coombe
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. In a small place like Coombe, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
Why book with us
- Sanitary silicone with an anti-fungal additive in wet areas
- A choice of colours where the product allows
- 20+ years of sealant experience
- Every job guaranteed for a year
See what affects the cost and customer reviews.
More services for Coombe
Frames and glazing around Coombe
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Church of St Peter and St Paul, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Rented homes near Little Kimble station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Coombe is about 5 miles south of Aylesbury, in Buckinghamshire. We carry out window mastic for homeowners, landlords and businesses in Coombe, as part of our work across Buckinghamshire. Coombe is one of 263 places in Buckinghamshire where we work for window mastic. We also work in Oxford, around 19 miles away.
Every address in HP17 is within our area for window mastic, from the main roads to the quietest streets. We also cover Butler's Cross (1 mile north), Ellesborough (1 mile north-west), Chalkshire (1 mile north), Terrick (1 mile north) and Nash Lee (1 mile north). Within a short drive, we also cover Aylesbury (5 miles north), High Wycombe (8 miles south), Chesham (8 miles east), Marlow (12 miles south), Amersham (9 miles south-east) and Beaconsfield (11 miles south-east).
Around Coombe
Locally, jobs take us to homes and businesses close to John Colet School and The Russell Arms and the streets around them. The closest station to Coombe is Little Kimble station, roughly 1.3 miles west. A little further out are Little Kimble Motte (1 mile west) and Trenchard Museum (3.1 miles north-east). Open spaces near Coombe include Brush Hill Local Nature Reserve and Coombe Hill.
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Ventilate rooms so frames don’t stay wet inside
- Avoid harsh chemicals near the mastic
- Paint up to the joint, not over it
- Look round the frames every year or so
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.