Buckinghamshire · England
Finmere Sand Mastic
Our applicators work in Finmere on 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 a 12-month guarantee.
- Draughty sash windows at the surround
- Mastic round period door frames that has failed
- Window mastic to renew ahead of painting
Sand mastic for homes and businesses in Finmere
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you have draughty sash windows at the surround and open joints round the window box, we can put it right, whatever the surface.
Somewhere as small as Finmere, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Finmere (MK18)
- Region
- Buckinghamshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
Every visit runs the same way: we check the joints, protect the area around them, do the work and tidy away. Most jobs take a few hours per window, depending on the condition of the joints. Somewhere as small as Finmere, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention any tricky access
- Tell us about any water getting in
- For business premises, tell us about site rules or sign-in
How to get a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We will send you a clear quote before any work starts.
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DIY versus a professional finish
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Look over the window mastic once a year
- Do not paint over the new mastic
- Renew mastic before redecorating the windows
- Keep sills and gutters clear so water drains away
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Timber that has rotted
- Damaged stone surrounds
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Timber door frames
- Period & listed homes
- Stone surrounds
- Brick reveals
- Tenement windows
- Sash and case windows
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams. We can quote a run of properties together.
Quotes for sand mastic in Finmere
Every job gets its own quote. These are the things that affect it:
- Whether the work is at height
- Whether there’s mould to deal with
- The amount of work
- How many rooms, windows or areas are involved
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and give you a clear quote before any work starts.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- Where the job is, and your postcode
- The problem you’ve noticed
- Photos by email, if that’s easy
- If someone has resealed it before
If you’re in Finmere and need sand mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before work begins.
Nearby places to Finmere
Also in Finmere
Questions from Finmere
Do you cover Finmere for sand mastic?
Yes, Finmere is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear quote.
Is there a guarantee on sand mastic in Finmere?
All our work, in Finmere and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
How do I get a quote for sand mastic in Finmere?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
Is consent needed for window work on a listed home?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we will advise.
What sand mastic looks like in Finmere
Historic houses like Stowe House (about 3.7 miles north-east) are a reminder that the area around Finmere has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Finmere Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St Michael, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Finmere is about 4 miles west of Buckingham, in Buckinghamshire. Finmere gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Finmere is one of 263 towns and villages in Buckinghamshire we cover. Oxford is on our list too, around 18 miles away.
Work in MK18 is quoted and booked the same way as anywhere else. You will find streets such as Chinalls Close, Stable Close and Fulwell Road, and we cover them all. Neighbouring places we cover for sand mastic include Tingewick (1 mile east), Preston Bissett (2 miles south-east), Gawcott (3 miles east), Hillesden (4 miles south-east) and Twyford (4 miles south-east). Larger places within reach include Buckingham (4 miles east), Haydon Hill (15 miles south-east), Winslow (9 miles east), Steeple Claydon (5 miles south-east), Long Crendon (15 miles south) and Whitchurch (13 miles south-east).
Local landmarks in Finmere
Other landmarks nearby include The Menagerie (3.6 miles north-east) and Buckingham Community Hospital (3.9 miles east). Green spaces nearby include Buckingham Sand Pit.
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps and traditional guidance is to leave the new mastic unpainted. Older cottages and farmhouses around Finmere can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why Finmere clients choose us
- We leave the area clean and tidy
- An ARBOMaster approved applicator
- More than 20 years in sealant work
- Any old sealant cut out fully, not covered over
Read our cost guide and our reviews.