Kent · England
Sand Mastic in Greatness
Sand mastic for Greatness and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
- Mastic that needs renewing before redecorating
Sand mastic in Greatness, done properly
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted and we’ll advise if you’re redecorating. We work on brick reveals, sash and case windows and period & listed homes, and common reasons people get in touch are old sand mastic that has cracked, crumbled or fallen out and draughty sash windows at the surround.
Houses in smaller places like Greatness can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Greatness (TN13, TN14, TN15)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work cannot fix
We will always be straight with you, so here’s what sealant can’t fix:
- Putty and glazing repairs
- Timber that has rotted
- Sashes that rattle, stick or will not open
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
What we seal
- Stone surrounds
- Period & listed homes
- Brick reveals
- Tenement windows
- Timber door frames
- Sash and case windows
Places near Greatness
More services for Greatness
Quotes for sand mastic in Greatness
For a quick quote, just ask. What matters most is:
- Whether old sealant or filler has to be cut out
- Whether the work is at height
- Working hours on commercial sites
- Which sealant suits the joint
What it costs depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- A few pictures by email, if you can
- The rough size of the job
Want a quote for sand mastic? Please phone 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear price before we start.
Do you need sand mastic in Greatness?
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
Common reasons people contact us include:
- Gaps round a timber door in stone or brick
- Old cement repairs round a window that have failed
- Draughts and rain around sash boxes
- Silicone on a period window that looks wrong
If you look after a building such as St John's Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How long to leave it before use
- How the joint is cleaned and prepared
- The length of the guarantee
- How much experience the applicator has
Landlord and commercial work in Greatness
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured.
For anyone letting property in or around Greatness, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Greatness questions
Will you come out to Greatness?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you cover Greatness for sand mastic?
Yes. Our work covers London and the South East, and Greatness is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
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 they decide.
How long does sand mastic take to harden?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Are you fully insured?
Yes. We are fully insured.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Why it’s worth doing now in Greatness
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. Homes in smaller places like Greatness can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why us?
- Fully insured
- We leave the area clean and tidy
- Over 20 years’ experience
- Approved under the ARBOMaster scheme
Take a look at how sealant jobs are priced and our reviews.
How the visit works
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes a few hours for a single window, longer for several from start to finish. Parking around Greatness is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We check each window surround and the condition of the joint.
- 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.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
How to get a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Advice
Greatness homes and the weather
With historic houses such as Knole House (about 1.7 miles south) nearby, there’s older building stock in the area around Greatness as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to St John the Baptist include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Bat & Ball station? Then any sash windows need sound mastic to keep draughts and rain out.
Greatness is about 1 mile north-east of Sevenoaks, in Kent. Homes, rented property, offices and hotels in Greatness is covered for sand mastic. Every job comes with our one-year guarantee. 922 places in Kent are on our list, from the larger towns to small villages. We also work in London, about 19 miles from Greatness.
Every address in TN13, TN14 and TN15 is covered for sand mastic. If you need sand mastic at a property on Seal Road, Mill Lane and Sandy Lane or a nearby road, we can help. Neighbouring places we cover for sand mastic include Seal (1 mile east), Godden Green (2 miles south-east), Styants Bottom (3 miles east), Bitchet Green (3 miles south-east) and Stone Street (3 miles south-east). We also work in nearby towns such as Maidstone (14 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (12 miles north-east), Tonbridge (7 miles south-east) and Northfleet (12 miles north-east).
What’s near Greatness
Typical jobs here are in homes near The Old Bat and Ball pub, Wildernesse School and Knole Academy and the streets around them. There’s a railway station in Greatness itself: Bat & Ball station. Nearby you’ll also find Sevenoaks Museum (1.3 miles south) and Kemsing Castle Bank (1.7 miles north-east). Not far away are Dryhill Nature Reserve.