Kent · England
Sand Mastic in Cooper Street
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Cooper Street, with a 12-month guarantee on every job. Call for a quick quote.
- Gaps between timber frames and stone or brick
- Weathered mastic on the most exposed windows
- Mastic round period door frames that has failed
For landlords and businesses
If you manage several properties in or around Cooper Street, several properties can be quoted together. Just tell us the addresses and what each one needs.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Sand mastic for homes and businesses in Cooper Street
Across Cooper Street, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. If you have cracked mastic round a front door frame and open joints round the window box, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Cooper Street is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Cooper Street (CT3)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Cooper Street
Also in Cooper Street
What sand mastic looks like in Cooper Street
Historic houses like Goodnestone Park (about 4.8 miles south-west) are a reminder that the area around Cooper Street 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. 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.
Historic houses such as Goodnestone Park, about 4.8 miles south-west, show how far back building around Cooper Street goes, and older homes nearby need a sealant that suits their walls. If you look after a building such as Sir Roger Manwood's School, larger buildings have plenty of frames, and the mastic around each one ages.
Cooper Street is about 6 miles south-west of Ramsgate, in Kent. Homes, rented property, offices and hotels in Cooper Street is covered for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Cooper Street is one of 922 towns and villages in Kent where we work. You can also see our page for Chelmsford, about 47 miles away.
Every address in CT3 is within our area for sand mastic. Other places close to Cooper Street include East Street (1 mile south), Great Stonar (2 miles east), Marshborough (2 miles south), Sandwich (2 miles south-east) and Woodnesborough (2 miles south). We also work in nearby towns such as Canterbury (10 miles west), Margate (7 miles north-east), Dover (11 miles south), Ramsgate (6 miles north-east), Broadstairs (7 miles north-east) and Whitstable (13 miles west).
Local landmarks in Cooper Street
The closest station to Cooper Street is Sandwich station, about 2.2 miles south-east. Nearby you will also find White Mill (1.3 miles south-east) and Ramsgate General Hospital (5.2 miles north-east). Open spaces near Cooper Street include Monk's Wall nature reserve.
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Renew mastic before redecorating the windows
- Inspect the joints round the windows every year or so
- Clear gutters so water does not pour onto the windows
- Ask a joiner to look at soft timber first
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber and timber that stays wet can rot.
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours per window, depending on the condition of the joints, including the tidy-up. Somewhere like Cooper Street needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
Getting a quote
We quote each job on its own. Simply ring 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
Related advice
Common questions in Cooper Street
Can you do sand mastic in Cooper Street?
Yes. Our work covers London and the South East, and Cooper Street is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
Is Cooper Street within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for letting agents?
Yes. We work for householders, landlords, letting agents, businesses and hotels.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Do I need permission for sand mastic on a listed building?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like but the decision is theirs.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Where is Mr Mastic based?
We’re based in Crawley, and we work across South East England, London and Scotland.
Will there be a smell?
There can be a smell while the sealant cures. Ventilation helps.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
When to call us in Cooper Street
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
It’s worth asking for a quote if you see:
- Cracked mastic round a front door frame
- Tired mastic found when preparing windows for paint
- Open joints round the window box
- Silicone on a period window that looks wrong
Letting a property close to Sandwich station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- What preparation is included
- Is VAT in the price?
- How long to leave it before use
- What insurance they hold
What happens if it’s left?
New mastic over crumbling mastic won’t hold. We remove the loose material first so the new work lasts. Where a wall is exposed, as many are in small places like Cooper Street, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why Cooper Street customers choose us
- Tidy, careful work
- Anti-fungal sanitary silicone in wet areas
- 20+ years of sealant experience
- Any old sealant cut out fully, not covered over
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.