Buckinghamshire · England
Sand mastic for sash & case windows in Chackmore, Buckinghamshire
We cover Chackmore for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
Common questions in Chackmore
Is sand mastic in Chackmore guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Is Chackmore in your area for sand mastic?
Yes, Chackmore is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
How long does the job take?
That depends on the amount of work, but most jobs take a few hours for a single window, longer for several. We’ll tell you when we quote.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Can you replace silicone on a period window with sand mastic?
Often, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Sand mastic for homes and businesses in Chackmore
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. If you are dealing with wind and rain getting in round a sash window and silicone on a period window that looks wrong, we can help, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Chackmore is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- Chackmore (MK18)
- Wider area
- Buckinghamshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Chackmore
New mastic over crumbling mastic won’t hold. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Where a wall is exposed, as many are in small places like Chackmore, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, 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.
Why book with us
- Neat joints and a tidy finish
- Anti-fungal silicone where joints get wet
- Over 20 years’ experience
- Every job guaranteed for a year
Take a look at what affects the cost or our reviews.
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Chackmore, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
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.
Related advice
Nearby places to Chackmore
Other services in Chackmore
What affects the cost of sand mastic
For a quick quote, just ask. The main things that affect it are:
- Working hours on commercial sites
- How easy the joints are to reach
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
What to tell us for a quote
When you call or email, it’s useful to know:
- The address or postcode of the job
- Photos by email, if that’s easy
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
If you are in Chackmore and need sand mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Chackmore homes and the weather
Historic houses like Stowe House (about 1.2 miles north-west) are a reminder that the area around Chackmore has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to Parish Church of St Mary include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Chackmore is about 2 miles north-west of Buckingham, in Buckinghamshire. Anywhere in MK18, our applicators can take on sand mastic. Across Buckinghamshire, we cover 263 places, and Chackmore is one of them. Oxford is on our list too, about 21 miles from Chackmore.
Jobs for sand mastic in MK18 is quoted and booked the same way as anywhere else. That includes homes and businesses on Main Street, New College Court and The Maltings and the roads around them. If you’re just outside Chackmore, we cover Radclive (1 mile south-west), Dadford (2 miles north-west), Water Stratford (2 miles west) and Shalstone (3 miles west). Within a short drive, we also cover Haydon Hill (15 miles south-east), Quarrendon Estate (15 miles south-east), Winslow (7 miles south-east), Watermead (15 miles south-east), Steeple Claydon (6 miles south) and Wingrave (15 miles south-east).
Landmarks near Chackmore
Typical jobs here are in homes near Buckingham School, Akeley Wood Senior School and Stowe Park and Garden. Nearby you’ll also find The Menagerie (1.2 miles north-west) and Buckingham Community Hospital (1.2 miles south-east). Green spaces nearby include Buckingham Sand Pit.
Do you need sand mastic in Chackmore?
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out so we make sure the new mastic is the right thickness.
The problems people generally mention when they call include:
- Mastic worn away on windows facing the weather
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
- Cracked mastic round a front door frame
If you look after a building such as St James and St John CofE Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- What product goes in the joint
- Is the old sealant removed completely?
- What guarantee comes with the work
- What the cure time is
What we can’t put right
In fairness, some problems need a different trade:
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
- Broken panes
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Brick reveals
- Timber door frames
- Period & listed homes
- Sash and case windows
- Tenement windows
- Stone surrounds
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
What the job involves on each surface
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.