Buckinghamshire · England
Sand mastic for sash & case windows in Kingswood, Buckinghamshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Kingswood. Fully insured, ARBOMaster approved and guaranteed for a year.
- Failed mastic on an exposed elevation
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
Leave it or put it right?
New mastic over crumbling mastic won’t hold. We remove the loose material first so the new work lasts. In a small place like Kingswood, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Kingswood
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
- Full insurance on every job
- Tidy, careful work
See what affects the cost or our reviews.
Sand mastic for homes and businesses in Kingswood
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. We work on stone surrounds, timber door frames and period & listed homes, and the jobs we see most are silicone on a period window that looks wrong and tired mastic found when preparing windows for paint.
In a village or hamlet like Kingswood, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Big or small, you get the same 12-month guarantee.
- Place
- Kingswood (HP18)
- Region
- Buckinghamshire
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours per window, depending on the condition of the joints, depending on the amount of work. In a small place like Kingswood, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about stairs, lifts or work at height
- Clear the area around the work
- Keep pets and children clear of the area while we work
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or email us.
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How we quote for sand mastic
Jobs vary more than people expect. The main factors:
- Which sealant suits the joint
- Access and height
- Mould in or behind the old joints
- The number of rooms or windows
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first.
Asking for a quote
To help us quote quickly, please include:
- Roughly how big the job is
- Whether it has been sealed before
- How we’d reach the joints
- Where the property is
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details.
Different surfaces, different methods
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we’ll confirm what’s needed.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
Questions from Kingswood
Is there a guarantee on sand mastic in Kingswood?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Can you do sand mastic in Kingswood?
Yes, Kingswood is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
How long does sand mastic take to go off?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
How long does the job take?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Bigger jobs take longer.
What does sand mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before we start.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
When to call us in Kingswood
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Common reasons people contact us include:
- Failed mastic on an exposed elevation
- Gaps round a timber door in stone or brick
- Window mastic to renew ahead of painting
- Old cement repairs round a window that have failed
If you look after a building such as Grendon Underwood Combined School, the mastic around its windows and doors needs looking after like any other building’s.
Before booking anyone
- How the surfaces are prepared before sealing
- Whether you can choose the colour
- What insurance they hold
- Whether the sealant suits the joint
Sand mastic in Kingswood: local notes
Historic houses like Waddesdon Manor (about 3 miles south-east) are a reminder that the area around Kingswood has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Historic houses such as Waddesdon Manor, about 3 miles south-east, show how far back building around Kingswood goes, and older homes nearby need a sealant that suits their walls.
Kingswood is about 7 miles east of Bicester, in Buckinghamshire. From the centre of Kingswood to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. 263 places in Buckinghamshire are on our list. We also work in Oxford, around 13 miles away.
Here we cover the HP18 postcode area for sand mastic. That includes homes and businesses on Grendon Road and Kingswood Lane and the roads around them. We also cover the places around Kingswood: Westcott (2 miles south-east), Quainton (3 miles east), Ashendon (3 miles south), Waddesdon (4 miles south-east) and Wormstone (4 miles south-east). We also work in nearby towns such as Aylesbury (8 miles south-east), Buckingham (9 miles north), Elmhurst (9 miles east), Southcourt (9 miles south-east), Princes Risborough (12 miles south-east) and Haydon Hill (7 miles south-east).
What’s near Kingswood
Typical jobs here are in homes near The Akeman Inn and the streets around them. Not far away are Upper Ray Meadows.
What else we do in Kingswood
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.