Buckinghamshire · England
Sand Mastic in Chesham
Specialist sand mastic for Chesham: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
- Tired mastic found when preparing windows for paint
Sand mastic in Chesham
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. If you have draughty sash windows at the surround and modern sealant on a period surround, we can help, on period & listed homes, tenement windows and stone surrounds alike.
Plenty of homes in a town like Chesham have had conservatories, patio doors or new windows added over the years. Each one adds more joints to look after, and those joints age at different rates. Leaks normally start at a sill, a frame head or a glazing joint.
Big or small, you get the same 12-month guarantee in Chesham and across Buckinghamshire.
- Where
- Chesham (HP5)
- Wider area
- Buckinghamshire
- Cover
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- 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 the new mastic is traditionally left unpainted. In Chesham, as anywhere, most leaks start as a small gap in a joint, and early is when they’re cheapest and quickest to sort.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What you get with us
- Old sealant always removed completely
- 180+ five-star Google reviews
- Arbo and Everbuild products
- Fully insured
Read what affects the cost or what customers say.
Quotes for sand mastic in Chesham
Your quote is based on your job. We look at:
- The size of the job
- Whether the work is at height
- The number of rooms or windows
- Any working-time requirements on site
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What we need to know
To help us quote quickly, please include:
- Roughly how big the job is
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
- How we’d reach the joints
For sand mastic in Chesham, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Looking after it afterwards
So the new joints stay in good condition:
- Check with your local planning authority if your home is listed
- Don’t paint over the new mastic
- Ask a joiner to look at soft timber first
- Avoid patching sand mastic with silicone
Do not touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
How the visit works
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a single window, longer for several. For a job in Chesham, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
Getting a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work.
Read more
Do you need sand mastic in Chesham?
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint and we normally remove them.
The most common problems we see are:
- Failed mastic on an exposed elevation
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
- Crumbling sand mastic round a window
If you look after a building such as Elmtree Infant and Nursery School, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- Which sealant they’ll use, and why
- How long the guarantee is
- What happens if the job turns out different
- Which colour the sealant will be
Common questions in Chesham
I let a flat near Amersham station. Can you help?
Yes. We work for letting agents and landlords as well as householders. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is sand mastic in Chesham guaranteed?
All our work, in Chesham and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses and we are fully insured.
Can I choose the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in.
Are you insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They decide whether consent is needed for work to your windows.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in.
Sand mastic in Chesham: local notes
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Cholesbury Manor House (about 3.5 miles north-west) nearby, there’s older building stock in the area around Chesham as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Rented homes near Amersham station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Historic houses such as Cholesbury Manor House, about 3.5 miles north-west, show how far back building around Chesham goes.
Chesham is about 7 miles south-west of Hemel Hempstead, in Buckinghamshire. From the centre of Chesham to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. We cover 263 towns and villages across Buckinghamshire, large and small. You can also see our page for Reading, about 24 miles away.
We cover every part of HP5 for sand mastic. You will find streets such as High Street, Station Road and Sunnyside Road, and we cover them all. Chesham is on the A416 and B485, so it’s easy for us to get to with everything needed for sand mastic. Neighbouring places we cover for sand mastic include Pond Park (1 mile north), Chartridge (2 miles north-west), Hundridge (2 miles west), Asheridge (2 miles north-west) and Bellingdon (2 miles north-west). We also work in nearby towns such as Aylesbury (11 miles north-west), High Wycombe (8 miles south-west), Marlow (12 miles south-west), Amersham (3 miles south), Beaconsfield (7 miles south) and Chalfont St Peter (8 miles south). Chesham is one of the larger places we cover in Buckinghamshire.
Near you in Chesham
Typical jobs here are in homes near Chiltern Hills Academy and The Jolly Sportsman pub, among other places. The nearest railway station is Amersham station, about 2.6 miles south of the centre. Well-known places in the area include Amersham Hospital (3.4 miles south) and Hawridge Court (2.2 miles north). Open spaces near Chesham include Sands Bank.
Landlord and commercial work in Chesham
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We work for landlords and agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Towns and villages near Chesham
Other services in Chesham
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Decisions on consent for listed homes
- Sashes that rattle, stick or will not open
- Broken panes
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Timber door frames
- Brick reveals
- Tenement windows