Buckinghamshire · England
Ashendon Sand Mastic
Our applicators work in Ashendon on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Mastic dropping out of the joint
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
How we handle sand mastic in Ashendon
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. We’re often asked to deal with mastic dropping out of the joint and failed mastic on an exposed elevation, on timber door frames, sash and case windows and stone surrounds.
Outdoor sealant needs dry, clean surfaces, so work on frames around Ashendon is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Ashendon (HP18)
- Region
- Buckinghamshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes a few hours for a single window, longer for several in most cases. Somewhere like Ashendon needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Tell us about any water getting in
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
Ask for a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and send you a clear quote before any work starts.
Advice
Leave it or put it right?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in and new mastic seals them. Where a wall is exposed, as many are in small places like Ashendon, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
Why us?
- 180+ five-star Google reviews
- A 12-month guarantee on all work
- Over 20 years’ experience
- We are fully insured
Quotes for sand mastic in Ashendon
Jobs vary more than people expect. What affects the quote:
- Mould in or behind the old joints
- Working hours on commercial sites
- The old material and how stubborn it is
- The number and length of the joints
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What to tell us for a quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- Where the property is
- Roughly how big the job is
- What’s wrong with the joints now
For sand mastic in Ashendon, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
What sand mastic looks like in Ashendon
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. 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.
Letting a property close to Haddenham & Thame Parkway station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Ashendon is about 5 miles north of Thame, in Buckinghamshire. Jobs in Ashendon get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 263 places across Buckinghamshire, from the larger towns to small villages. You can also see our page for Oxford, about 12 miles away.
We work across the HP18 postcode area for sand mastic. If you need sand mastic at a property on Main Street, Lower End and The Close or anywhere close by, we can help. Nearby, we also carry out sand mastic 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). We also work in nearby towns such as 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
The nearest railway station is Haddenham & Thame Parkway station, about 3.9 miles south-east of the centre. A little further out are Dinton Castle (4.1 miles south-east) and St John's Hospital (4.6 miles east). Not far away are Snakemoor.
Nearby places to Ashendon
What else we do in Ashendon
Do you need sand mastic in Ashendon?
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
Look out for any of the following:
- Patchy fillers round a sash window
- Mastic round period door frames that has failed
- Mastic dropping out of the joint
- Mastic that needs renewing before redecorating
For an older house near a landmark such as Parish Church of St Mary the Virgin, the joint between an old wall and a newer frame is generally the first place rain gets in.
Comparing quotes
- How long to leave it before use
- Who turns up on the day
- Whether they’re fully insured
- How the surfaces are prepared before sealing
What the job involves on each surface
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Your questions about sand mastic in Ashendon
Can you help a landlord with a rental near Haddenham & Thame Parkway station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Is Ashendon in your area for sand mastic?
Yes. We work across London and the South East, and Ashendon is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will tell you what we’re using.
How long does sand mastic take?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer, and we will say how long yours will take.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Landlord and commercial work in Ashendon
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.