Kent · England
Sand Mastic in Deal
We cover Deal for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Tired mastic found when preparing windows for paint
- Patchy fillers round a sash window
- Failed mastic on an exposed elevation
Sand mastic for homes and businesses in Deal
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. Common call-outs are for gaps between timber frames and stone or brick and weathered mastic on the most exposed windows, across stone surrounds, period & listed homes and sash and case windows.
In a town like Deal, older houses sit alongside newer estates, with windows of every age. In every case, the joint between frame and wall is what keeps water out.
A one-year guarantee comes as standard.
- Place
- Deal (CT14)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
The work is kept neat and contained to the area we are working on, so you can carry on as normal. The job normally takes a few hours for a single window, longer for several. For a job in Deal, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
If you’re in Deal and need sand mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Read more
Different surfaces, different methods
Period and listed homes
Period homes look their best with traditional materials.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Landlords, agents and businesses in Deal
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Signs you need sand mastic in Deal
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
Keep an eye out for these signs:
- Silicone on a period window that looks wrong
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
- Cement or filler used on old window joints that has cracked
Rented homes near Deal station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- Whether the sealant suits the joint
- Which colour the sealant will be
- How long the guarantee is
- Who turns up on the day
What else we do in Deal
Common questions in Deal
Can you help a landlord with a rental near Deal station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Can you do sand mastic in Deal?
Yes. Our work covers London and the South East, and Deal is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
How long does sand mastic take to harden?
A skin forms quite soon, but full hardening takes longer. We’ll tell you what to expect for your job.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Is consent needed for window work on a listed home?
Your local planning authority is the one to ask. They’ll tell you if consent is needed for work to your windows.
Is the work guaranteed?
Our one-year guarantee covers every job, sand mastic included.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
What information do you need?
Tell us what needs doing and where, with photos by email if possible. If we need more, we’ll ask.
Deal homes and the weather
Deal is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. With historic houses such as Walmer Castle (about 1.2 miles south) nearby, there’s older building stock in the area around Deal as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to St Saviour's include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Castle Community College? Then larger buildings have plenty of frames, and the mastic around each one ages.
Deal is about 14 miles east of Canterbury, in Kent. Anywhere in CT14, we can carry out sand mastic at your property. Our area takes in 922 places across Kent, from the larger towns to small villages. For nearby work, see our Chelmsford page, about 53 miles away.
Work in CT14 is quoted and booked the same way as anywhere else. You will find streets such as London Road, Forelands Square and Herschell Square, and we cover them all. Main roads around Deal include the A258 and B2056, so getting to you is simple. Close by, we work in Mill Hill (1 mile west), Walmer (1 mile south), Sholden (1 mile north-west), Sholden Meadows (1 mile north-west) and Great Mongeham (1 mile west). Larger places within reach include Canterbury (14 miles west), Margate (11 miles north), Dover (7 miles south-west), Folkestone (13 miles south-west), Ramsgate (8 miles north) and Broadstairs (10 miles north).
Near you in Deal
Around Deal, our work takes us to homes and buildings near Betteshanger Park, Brickmakers Arms and Deal Parochial Church of England Primary School. For rail, the closest station is Deal station, about 0.5 miles north-east. A little further out are Kent Museum of the Moving Image (0.6 miles north-east) and Deal Castle (0.5 miles east).
When it is not the sealant
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Putty and glazing repairs
- Damaged stone surrounds
- Decayed frames that need repair
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Sash and case windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Tenement windows
- Stone surrounds
Looking after it afterwards
After the cure time, these simple habits help:
- Ask a joiner to look at soft timber first
- Take care around the mastic when scraping paint
- Find out about consent before window work on a listed home
- Keep modern sealant off the mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.