Buckinghamshire · England
Sand Mastic in Amersham
Sand mastic across Amersham and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
- Gaps round a timber door in stone or brick
Landlords, agents and businesses in Amersham
For anyone letting property in or around Amersham, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
We work for landlords and letting agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Sand mastic for homes and businesses in Amersham
We work across Amersham renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. Typical jobs include old sand mastic that has cracked, crumbled or fallen out and cement or filler used on old window joints that has cracked, on sash and case windows, tenement windows and period & listed homes.
Amersham mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. In every case, the joint between frame and wall is what keeps water out.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Amersham (HP6, HP7)
- Wider area
- Buckinghamshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need sand mastic in Amersham
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
These are the problems we’re asked about most:
- Draughts and rain around sash boxes
- Gaps between timber frames and stone or brick
- Window mastic to renew ahead of painting
- Modern sealant on a period surround
Letting a property close to Amersham station? Then any sash windows need sound mastic to keep draughts and rain out.
Before booking anyone
- How long the guarantee is
- Whether you can choose the colour
- Is the old sealant removed completely?
- Whether the sealant suits the joint
Frames and glazing around Amersham
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Chenies Manor House (about 3 miles east) nearby, there’s older building stock in the area around Amersham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you live in an older home near St. Michael and All Angels, the joint between an old wall and a newer frame is normally the first place rain gets in.
Amersham is about 7 miles north-east of High Wycombe, in Buckinghamshire. Homes, rented property, offices and hotels in Amersham is covered for sand mastic. The work is guaranteed for a year. Across Buckinghamshire, we cover 263 places, and Amersham is one of them. Reading is on our list too, around 23 miles away.
We work across HP6 and HP7 for sand mastic. Sand mastic is available to properties on Station Road, London Road West and Market Square and the roads around them. With the A355 and A404 close by, Amersham is easy for our applicators to reach. We also cover the places around Amersham: Amersham on the Hill (1 mile west), Chesham Bois (1 mile north), Waterside (1 mile north), Coleshill (2 miles south-west) and Hyde Heath (2 miles north-west). Larger places within reach include Aylesbury (13 miles north-west), High Wycombe (7 miles south-west), Chesham (3 miles north), Marlow (10 miles south-west), Beaconsfield (5 miles south-west) and Chalfont St Peter (5 miles south). Amersham is one of the larger places we cover in Buckinghamshire.
Near you in Amersham
We work in homes and buildings around The Pheasant Public House, Woodside Junior School and Dr Challoner's Grammar School, among other places. Amersham has its own railway station: Amersham station. Well-known places in the area include Amersham Hospital (1.2 miles south-west) and Amersham Fair Organ Museum (less than half a mile north-east). Green spaces nearby include Sands Bank.
What we do, step by step
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. It normally takes anything from a few hours to a full day, depending on how many windows. Parking in a town like Amersham is usually straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
Ask for a quote
Getting a quote is simple: tell us what needs doing and where. Photos by email help us understand the job.
Advice
Why deal with it now?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and they’re far easier to fix early.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email and we’ll talk you through it.
Why us?
- Full insurance on every job
- 4.9 on Google from 180+ five-star reviews
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
Towns and villages near Amersham
What else we do in Amersham
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Amersham: your questions answered
I let a flat near Amersham station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can you do sand mastic in Amersham?
Yes. We work across London and the South East, and Amersham is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or email us.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages.
Surface by surface
Stone surrounds
Stone openings are rarely perfectly straight, so the joint varies in width. We shape it by hand to follow the stone.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Take care around the mastic when scraping paint
- Keep sills and gutters clear so water drains away
- Inspect the joints round the windows every year or so
- Ask us before painting near the mastic
Don’t touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.