Kent · England
Sand mastic for sash & case windows in Chevening, Kent
Sand mastic in Chevening from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Wind and rain getting in round a sash window
When something else is needed
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Whether work needs listed building consent
- Putty and glazing repairs
- Masonry that needs repairing
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
Surfaces we seal
- Period & listed homes
- Tenement windows
- Stone surrounds
- Brick reveals
- Sash and case windows
- Timber door frames
How we handle sand mastic in Chevening
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on stone surrounds, period & listed homes and timber door frames, and the jobs we see most are mastic round period door frames that has failed and silicone on a period window that looks wrong.
Mastic can only go onto a dry, clean joint, so window work in Chevening is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Our work is backed for twelve months, in Chevening and everywhere else we cover.
- Location
- Chevening (TN14)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Chevening
Draughts round a sash window aren’t always the sashes. Open mastic joints round the box can let air in and new mastic seals them. In a small place like Chevening, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
What you get with us
- Trusted Arbo and Everbuild sealants
- Sanitary silicone with an anti-fungal additive in wet areas
- 20+ years of sealant experience
- Rated 4.9 stars on Google
See our cost guide or what customers say.
Towns and villages near Chevening
Also in Chevening
For landlords and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Access and height
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Asking for a quote
To help us quote quickly, please include:
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- How we’d reach the joints
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Aftercare tips
To keep the joints looking good and working properly:
- Clear gutters so water doesn’t pour onto the windows
- Do not run silicone over sand mastic
- Get any rot dealt with first
- Take care around the mastic when scraping paint
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours per window, depending on the condition of the joints. Somewhere like Chevening needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or drop us an email.
Read more
Questions from Chevening
Can you help a landlord with a rental near Dunton Green station?
Yes. We work for landlords and agents as well as homeowners, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Is Chevening in your area for sand mastic?
Yes, Chevening is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. We remove it all first.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and shaped to suit the surround.
Are you insured?
Yes. We are fully insured.
Can you do several jobs on one visit?
Yes. More than one area can go on one quote.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Frames and glazing around Chevening
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Quebec House (about 3.3 miles south-west) nearby, there’s older building stock in the area around Chevening as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Combe Bank School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of St Botolph, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Dunton Green station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Chevening is about 3 miles north-west of Sevenoaks, in Kent. We carry out sand mastic for homes and businesses in Chevening and the surrounding area. Our area takes in 922 places across Kent. Our London page covers work nearby.
We work across TN14 for sand mastic. Nearby, we also carry out sand mastic in Chipstead (1 mile south-east), Sundridge (2 miles south), Dunton Green (2 miles east), Bessels Green (2 miles south-east) and Riverhead (2 miles south-east). We also work in nearby towns such as Dartford (11 miles north), Sevenoaks (3 miles south-east), Royal Tunbridge Wells (13 miles south-east), Gravesend (14 miles north-east), Tonbridge (9 miles south-east) and Northfleet (13 miles north-east).
What’s near Chevening
In Chevening, that means homes and buildings near Trinity School and the streets around them. For rail, the closest station is Dunton Green station, about 1.7 miles east of the centre. A little further out are Sevenoaks Hospital (2.8 miles east) and Kemsing Castle Bank (4.2 miles east). Open spaces near Chevening include Dryhill Nature Reserve and Betsom's Hill.