Buckinghamshire · England
Sand Mastic in Thornborough
Problem with your window and door surrounds in Thornborough? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Old cement repairs round a window that have failed
- Gaps between timber frames and stone or brick
- Mastic that needs renewing before redecorating
How we handle sand mastic in Thornborough
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Like-for-like sand mastic is often the preferred finish. Typical jobs include draughty sash windows at the surround and silicone on a period window that looks wrong, across stone surrounds, sash and case windows and brick reveals.
Somewhere as small as Thornborough, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Thornborough (MK18)
- Wider area
- Buckinghamshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we’re called out for in Thornborough
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
Any of these means the joints need attention:
- Failed mastic on an exposed elevation
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Mastic dropping out of the joint
If you live in an older home near Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- The length of the guarantee
- What happens if the job turns out different
- Whether VAT is included
- Whether all the old sealant comes out first
Nearby places to Thornborough
Other services in Thornborough
Aftercare tips
Looking after new joints is easy:
- Look over the window mastic once a year
- Sort the mastic before the decorators arrive
- Check with your local planning authority if your home is listed
- Make sure water runs off the sill
Avoid painting over the new mastic, as traditional guidance advises. If you are redecorating, ask us first.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Thornborough, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Preparing for the visit
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
Get a quote
Every job is quoted individually. Just ring 0345 464 0079 or email us with the details.
Advice
What affects the quote in Thornborough
We quote each job individually. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- Access and height
- How many rooms, windows or areas are involved
- When we can work, for business premises
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- Whether it has been sealed before
- The problem you’ve noticed
- The rough size of the job
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Landlord and commercial work in Thornborough
Letting agents often deal with us directly. Tell us the address, the job and how access works.
If you manage several properties in or around Thornborough, several properties can be quoted together. Send us the addresses and the work at each.
What sand mastic looks like in Thornborough
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Stowe House (about 4.9 miles north-west) nearby, there’s older building stock in the area around Thornborough 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.
Schools such as Thornborough Infant School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Thornborough is about 3 miles east of Buckingham, in Buckinghamshire. Anywhere in MK18, we can carry out sand mastic at your property. Thornborough is one of 263 places in Buckinghamshire where we work for sand mastic. We also work in Oxford, about 22 miles from Thornborough.
Here we cover the MK18 postcode area for sand mastic. You will find streets such as High Street, Chapel Lane and The Green, and we cover them all. If you are just outside Thornborough, we cover Adstock (2 miles south), Padbury (2 miles south-west), Buckingham (3 miles west), Steeple Claydon (5 miles south-west) and East Claydon (5 miles south). Larger places within reach include Aylesbury (13 miles south), Elmhurst (13 miles south), Southcourt (14 miles south), Haydon Hill (12 miles south), Turnfurlong (14 miles south) and Quarrendon Estate (12 miles south).
Local landmarks in Thornborough
Other landmarks nearby include Buckingham Castle (3.1 miles west) and Buckingham Movie Museum (3 miles west). Not far away are Buckingham Sand Pit.
Your questions about sand mastic in Thornborough
Is sand mastic in Thornborough guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Will you come out to Thornborough?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Can you quote for more than one area?
Yes. More than one area can go on one quote.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
How long does sand mastic take to go off?
It takes a while. It skins first and hardens fully later, and we will tell you what to expect.