Buckinghamshire · England
Alscot Sand Mastic
Sand mastic for Alscot and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Failed mastic on an exposed elevation
- Gaps between timber frames and stone or brick
- Mastic that needs renewing before redecorating
Sand mastic in Alscot
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. If you’re dealing with cement or filler used on old window joints that has cracked and mastic that needs renewing before redecorating, we can put it right, on timber door frames, period & listed homes and brick reveals alike.
Homes in small places like Alscot often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Alscot (HP27)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. In a small place like Alscot, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Why book with us
- More than 20 years in sealant work
- Experience in homes, commercial sites and hotels
- ARBOMaster approved applicator
- A 12-month guarantee on all work
Read what affects the cost or customer reviews.
What we do, step by step
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. Most jobs take a few hours per window, depending on the condition of the joints. Somewhere as small as Alscot, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- 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.
Before we arrive
- Let us know about parking restrictions
- Mention any sign-in or site rules at work premises
- Keep children and pets away from the work area
Get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Related advice
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- The size of the job
- The old material and how stubborn it is
- Whether there’s mould to deal with
- The number of rooms or windows
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
For a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Common problems we fix in Alscot
Timber swells and shrinks with the weather. The movement cracks the mastic little by little.
These are the problems we’re asked about most:
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
- Modern sealant on a period surround
- Cracked mastic round a front door frame
Schools such as Princes Risborough Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- What insurance they hold
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
- Is VAT in the price?
Places near Alscot
What else we do in Alscot
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What sand mastic looks like in Alscot
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.
Rented homes near Monks Risborough station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as St Teresa's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Alscot is about 6 miles east of Thame, in Buckinghamshire. We provide sand mastic to householders, landlords and businesses in Alscot and nearby. Our area takes in 263 places across Buckinghamshire, from the larger towns to small villages. There’s also a page for Oxford, roughly 17 miles from Alscot.
Postcode districts we cover here for sand mastic: HP27. Nearby, we also carry out sand mastic in Monks Risborough (1 mile east), Princes Risborough (1 mile south-east), Longwick (1 mile west), Askett (1 mile north-east) and Meadle (1 mile north). We also work in nearby towns such as Aylesbury (6 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).
Landmarks near Alscot
We work in homes and buildings around The Whiteleaf Cross pub and Princes Risborough School, among other places. For rail, the closest station is Monks Risborough station, roughly 0.5 miles north-east of the centre. Nearby you’ll also find Stoke Mandeville Hospital (4.8 miles north) and Great Kimble Dial Hill (1.7 miles north-east). The countryside around Alscot includes Beacon Hill and Brush Hill Local Nature Reserve.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Keep modern sealant off the mastic
- Ask the planning authority about consent for listed or conservation-area homes
- Clear gutters so water does not pour onto the windows
- Look over the window mastic once a year
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
FAQs for Alscot
Do you cover smaller places like Alscot?
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 work for landlords with property near Monks Risborough station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. All the old silicone is removed first so the mastic can sit properly.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Should I use sand mastic or silicone?
It depends on the window. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Can you quote for more than one area?
Of course. Doing several areas at once is normally more efficient.
How the job changes by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is generally favoured.
Stone surrounds
We take care not to mark the stone while raking out the old mastic.