Kent · England
Sand mastic for sash & case windows in Clement Street, Kent
We cover Clement Street for 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 one-year guarantee.
- A silicone bead on a sash window that spoils the look
- Mastic worn away on windows facing the weather
- Old cement repairs round a window that have failed
About our sand mastic in Clement Street
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. Common call-outs are for draughty sash windows at the surround and weathered mastic on the most exposed windows, across sash and case windows, timber door frames and brick reveals.
Around Clement Street, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or drop us an email.
- Location
- Clement Street (BR8)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to a full day, depending on how many windows and we leave things clean and tidy. Somewhere as small as Clement Street, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
- Mention any parking rules near the property
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or email us.
Advice
For landlords and businesses
We work for landlords and agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Sand mastic in Clement Street: local notes
The South East is one of the drier parts 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 Hall Place and Gardens (about 3.3 miles north-west) nearby, there’s older building stock in the area around Clement Street as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Sutton-At-Hone Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Farningham Road station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Clement Street is about 2 miles south of Dartford, in Kent. From the centre of Clement Street to the outskirts, we cover sand mastic for every kind of property. Our area takes in 922 places across Kent, large and small. Our London page covers work nearby (14 miles or so).
Our applicators cover all of the BR8 postcode area for sand mastic and the streets around it. We also cover the places around Clement Street: Hawley (1 mile north-east), Sutton at Hone (1 mile east), South Darenth (2 miles south-east), Darenth (2 miles east) and St Margarets (2 miles east). Further out, we also cover Sevenoaks (9 miles south), Gravesend (7 miles east), Tonbridge (15 miles south), Northfleet (6 miles east), Kings Hill (13 miles south-east) and Swanscombe (4 miles north-east).
Around Clement Street
Typical jobs here are in homes near Dartford Heath, Wilmington Academy and The Plough pub. Clement Street’s nearest station is Farningham Road station, roughly 1.3 miles south-east of the centre. Well-known places in the area include Eynsford Castle (3 miles south) and West Hill Hospital (2.2 miles north). The countryside around Clement Street includes Wansunt Pit.
Common questions in Clement Street
Do you cover smaller places like Clement Street?
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.
I let a flat near Farningham Road station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Can you match the sealant colour?
Normally, yes. Sealants come in white, clear, grey and other colours, and we’ll agree it with you first.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Do you have insurance?
Yes. We’re fully insured.
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.
How do I get a quote for sand mastic in Clement Street?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected.
What the job involves on each surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
What sealant work can’t fix
Sealant is not the answer to every problem, and we will tell you before work begins. It won’t solve:
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
- Decisions on consent for listed homes
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Where we work in Clement Street
- Period & listed homes
- Timber door frames
- Stone surrounds
- Brick reveals
- Sash and case windows
- Tenement windows
Common problems we fix in Clement Street
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Signs it’s time to call us include:
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
- Failed mastic on an exposed elevation
In the older streets around Church of Saint Paul, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- Whether you can choose the colour
- How long to leave it before use
- Are they insured?
- How long the guarantee is
What happens if it’s left?
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. Where a wall is exposed, as many are in small places like Clement Street, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why book with us
- Every job guaranteed for a year
- ARBOMaster approved applicator
- Rated 4.9 stars on Google
- Tidy, careful work
Take a look at what affects the cost or what customers say.
Places near Clement Street
More services for Clement Street
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.