Buckinghamshire · England
Ashendon Window Mastic
Mastic around window and door frames, sills and patio doors in Ashendon, with a one-year guarantee on every job. Call for a quick quote.
- Water coming in at the bottom corners of a door
- Draughty joints inside around the window
- Draughts coming in around windows and doors
Questions from Ashendon
Can you do window mastic in Ashendon?
Yes. Our work covers London and the South East, and Ashendon is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Do you cover smaller places like Ashendon?
Yes, Ashendon is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Will new mastic stop draughts?
In many cases. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Is the new sealant paintable?
Not if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Window mastic in Ashendon
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. If you have mastic that has split away from the wall and a bead that doesn’t match the frame, we can put it right.
Homes in small places like Ashendon often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Location
- Ashendon (HP18)
- Wider area
- Buckinghamshire
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Window mastic in Ashendon: local notes
Historic houses like Waddesdon Manor (about 2.3 miles north-east) are a reminder that the area around Ashendon 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.
Letting a property close to Haddenham & Thame Parkway station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Ashendon is about 5 miles north of Thame, in Buckinghamshire. Every kind of property in Ashendon can book us for window mastic, old or new, large or small. The work is guaranteed for a year. We cover 263 towns and villages across Buckinghamshire. For nearby work, see our Oxford page, about 12 miles away.
We cover every part of the HP18 postcode area for window mastic and the streets around it. Whether your property is on Main Street, Lower End and The Close or anywhere close by, we can help. Close by, we work in Nether Winchendon (2 miles south-east), Westcott (2 miles north-east), Upper Winchendon (2 miles east), Waddesdon (3 miles north-east) and Wormstone (3 miles north-east). Further out, we also cover Aylesbury (7 miles east), Buckingham (12 miles north), Elmhurst (7 miles east), Southcourt (7 miles east), Princes Risborough (9 miles south-east) and Haydon Hill (6 miles east).
Local landmarks in Ashendon
For rail, the closest station is Haddenham & Thame Parkway station, about 3.9 miles south-east of the centre. Other landmarks nearby include Dinton Castle (4.1 miles south-east) and St John's Hospital (4.6 miles east). Open spaces near Ashendon include Snakemoor.
What sealant work cannot fix
It helps to know what we can’t do too:
- A sash or casement that will not close properly
- Penetrating damp from a failed cavity tray or render
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Window sills
- Composite doors
- Aluminium frames
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
- Wipe condensation off the frames
- Look round the frames every year or so
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
Towns and villages near Ashendon
Also in Ashendon
Landlord and commercial work in Ashendon
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
How we quote for window mastic
We quote each job individually. These are the things that affect it:
- How easy the joints are to reach
- When we can work, for business premises
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Asking for a quote
Before you ask for a quote, have a think about:
- Where the property is
- The type of property
- A few photos by email, if you can
- Access, such as stairs, a lift or height
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How the visit works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a handful of frames, longer for a whole house. Somewhere like Ashendon needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Clear items away from the joints we are working on
- Tell us about any water getting in
- Keep pets and children clear of the area while we work
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
What we’re called out for in Ashendon
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
It’s worth asking for a quote if you see:
- Whistling draughts around closed windows
- Sealant in the wrong colour for the frame
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
If you live in an older home near Parish Church of St Mary the Virgin, the joint between an old wall and a newer frame is usually the first place rain gets in.
What to look for in a quote
- How the colour is chosen
- Whether all the old sealant comes out first
- How long the guarantee is
- What insurance they hold