Oxfordshire · England
Thame Sand Mastic
Problem with your window and door surrounds in Thame? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Old cement repairs round a window that have failed
- Gaps between timber frames and stone or brick
How we handle sand mastic in Thame
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. Common call-outs are for cement or filler used on old window joints that has cracked and mastic dropping out of the joint, on period & listed homes, timber door frames and tenement windows.
Walls in Thame that face the prevailing wind take the most weather, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Where
- Thame (OX9)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
Not every filler suits an old window surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. In a family home in Thame, a failed seal around a bath or a frame lets water into places you cannot see, like the floor under a bath, the back of a panel or the inside of a wall. Left alone, that means rot, damp and a bigger repair.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
What you get with us
- Quality sealants from Arbo and Everbuild
- We never seal over old sealant
- Rated 4.9 stars on Google
- Every job guaranteed for a year
Read what affects the cost or our reviews.
What we do, step by step
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes a few hours per window, depending on the condition of the joints, depending on the amount of work. For a job in Thame, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We check the window surrounds and agree which joints need renewing.
- Old, loose 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.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Mention any tricky access
- Let us know about earlier repairs to the joints
- Clear items away from the joints we are working on
How to get a quote
We quote each job on its own, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details, and photos are welcome.
Advice
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Damaged stone surrounds
- Putty and glazing repairs
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Tenement windows
- Period & listed homes
- Brick reveals
- Sash and case windows
- Stone surrounds
- Timber door frames
Quotes for sand mastic in Thame
Jobs vary more than people expect. What affects the quote:
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- The number and length of the joints
- How easy the joints are to reach
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
To help us quote quickly, let us know:
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- Photos by email, if that is easy
- How many joints, rooms or windows are involved
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Frames and glazing around Thame
With historic houses such as Adwell House (about 3.9 miles south) nearby, there’s older building stock in the area around Thame 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. 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 Haddenham & Thame Parkway station change hands often, and any sash windows need sound mastic to keep draughts and rain out. For site and facilities teams at buildings such as Barley Hill Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Thame is about 8 miles south-west of Aylesbury, in Oxfordshire. From the centre of Thame to the outskirts, sand mastic is available for homes and businesses alike. Our Oxfordshire coverage runs to 443 places, Thame among them. There’s also a page for Oxford, about 11 miles away.
We work across the OX9 postcode area for sand mastic and the streets around it. Whether your property is on Upper High Street, Butter Market and High Street or a nearby road, our applicators can take on the job. Thame is on the A329 and A418, which makes it straightforward to reach with everything needed for sand mastic. We also cover Moreton (1 mile south-west), Towersey (1 mile east), Kingsey (2 miles east), Long Crendon (2 miles north-west) and Haddenham (3 miles north-east). Further out, we also cover Oxford (11 miles west), Didcot (15 miles south-west), Bicester (13 miles north-west), Abingdon-on-Thames (14 miles west), Henley-on-Thames (15 miles south) and Kidlington (14 miles west). As one of the bigger places in Oxfordshire, Thame has every kind of property, from flats to offices.
Around Thame
Locally, jobs take us to homes and businesses close to Lord Williams's School and Cross Keys Public House and the streets around them. The nearest railway station is Haddenham & Thame Parkway station, about 2.1 miles north-east of the centre. Other landmarks nearby include Thame Museum (0.5 miles north-west) and Thame Community Hospital (under half a mile south-east). For a walk, there’s Snakemoor.
More services for Thame
Landlords, agents and businesses in Thame
We also work for property managers and facilities teams in Thame and across Oxfordshire. Several sites can go on one quote.
Letting agents and landlords in Thame can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Signs you need sand mastic in Thame
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
These are the problems we are asked about most:
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
- Old cement repairs round a window that have failed
- Tired mastic found when preparing windows for paint
For an older house near a landmark such as Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- What happens if the job turns out different
- What product goes in the joint
- How much experience the applicator has
- What insurance they hold
Common questions in Thame
Is there a guarantee on sand mastic in Thame?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Can you do sand mastic in Thame?
Yes, Thame is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will talk you through it.
Should I use sand mastic or silicone?
We’ll help you decide. Period homes often look best with sand mastic, and modern sealants suit newer frames.
How long will you be here?
A typical job takes a few hours for a single window, longer for several. We’ll confirm how long when we quote.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic can sit properly.