Buckinghamshire · England
Horsenden Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Horsenden and across Buckinghamshire. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weathered mastic on the most exposed windows
- A silicone bead on a sash window that spoils the look
- Tired mastic found when preparing windows for paint
Sand mastic for homes and businesses in Horsenden
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on period & listed homes, sash and case windows and tenement windows, and people most often call us about wind and rain getting in round a sash window and failed mastic on an exposed elevation.
Around Horsenden, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Every job comes with a one-year guarantee.
- Location
- Horsenden (HP27)
- Region
- Buckinghamshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Horsenden questions
Can you help a landlord with a rental near Princes Risborough station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Is Horsenden within the area you cover?
Yes, Horsenden is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do I need to be at home?
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.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Horsenden, along with the rest of our area.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
How long will you be here?
A typical job takes anything from a few hours to a full day, depending on how many windows, including the preparation. Your quote will say how long we expect yours to take.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later and we’ll give you an idea for your job.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Plan mastic work ahead of painting
- Avoid heavy scraping on the mastic joint
- Make sure water runs off the sill
- Have rotten timber repaired before new mastic goes in
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
The process
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the job takes anything from a few hours to a full day, depending on how many windows in most cases. Somewhere as small as Horsenden, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
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Places near Horsenden
Other services in Horsenden
What affects the cost of sand mastic
Your quote is based on your job. We look at:
- The size of the job
- The type of sealant required
- How many areas need sealing
- Access and height
Doing several joints on one visit usually makes better use of the time than several visits. You will get one clear quote for the whole job.
Asking for a quote
To make quoting easier, let us know:
- Whether it has been sealed before
- Where the property is
- Any access issues, like height or stairs
- The rough size of the job
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
What the job involves on each surface
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Timber door frames
Round a period front door, sand mastic gives the right look.
Do you need sand mastic in Horsenden?
Over the years, sand mastic weathers. It hardens, cracks and starts to come away on the stone or timber.
It’s worth asking for a quote if you see:
- Old cement repairs round a window that have failed
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Gaps between timber frames and stone or brick
For an older house near a landmark such as Church of St Michael and All Angels, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- Whether all the old sealant comes out first
- How the surfaces are prepared before sealing
- When the joint can take water or movement
- Which sealant they’ll use, and why
Landlord and commercial work in Horsenden
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
What sand mastic looks like in Horsenden
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Princes Risborough School, the mastic around its windows and doors needs looking after like any other building’s. If you let a flat or house near Princes Risborough station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Horsenden is about 5 miles east of Thame, in Buckinghamshire. Every kind of property in Horsenden is covered for sand mastic. The work is guaranteed for a year. Across Buckinghamshire, we cover 263 places, and Horsenden is one of them. You can also see our page for Oxford, about 16 miles away.
Here we cover the HP27 postcode area for sand mastic. Other places close to Horsenden include Bledlow (1 mile south-west), Princes Risborough (1 mile east), Pitch Green (1 mile west), Alscot (1 mile north-east) and Longwick (1 mile north). Within a short drive, we also cover Aylesbury (7 miles north), High Wycombe (8 miles south-east), Chesham (10 miles east), Marlow (11 miles south), Amersham (11 miles east) and Beaconsfield (12 miles south-east).
What’s near Horsenden
Around Horsenden, our work takes us to homes and buildings near Princes Risborough Primary School and The Bird in Hand pub, among other places. Horsenden has its own railway station: Princes Risborough station. Other landmarks nearby include Thame Community Hospital (5.3 miles west) and Great Kimble Dial Hill (2.7 miles north-east). The countryside around Horsenden includes Brush Hill Local Nature Reserve and Beacon Hill.
When something else is needed
Before booking, it’s worth knowing the limits too:
- Damaged stone surrounds
- Broken panes
- Planning or listed building consent (your local planning authority decides)
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Where we work in Horsenden
- Sash and case windows
- Timber door frames
- Brick reveals
- Tenement windows
- Period & listed homes
- Stone surrounds