Kent · England
Colt's Hill Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Colt's Hill. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Tired mastic found when preparing windows for paint
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
How it works
The work is kept neat and contained to the area we are working on. Expect the work to take a few hours for a single window, longer for several, and we tell you how long to leave it before we go. For a village or hamlet like Colt's Hill, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.
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How we handle sand mastic in Colt's Hill
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead and we’ll explain which is best for yours. We work on brick reveals, sash and case windows and tenement windows, and people most often call us about cement or filler used on old window joints that has cracked and gaps round a timber door in stone or brick.
Homes in small places like Colt's Hill often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Every job is covered by a 12-month guarantee, wherever you are in Kent.
- Where
- Colt's Hill (TN12)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for sand mastic in Colt's Hill
You’ll get a clear quote before we start. It takes into account:
- Mould in or behind the old joints
- Any working-time requirements on site
- The type of sealant required
- Access and height
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- Whether it has been sealed before
- The address or postcode of the job
- The type of property
- How many joints, rooms or windows are involved
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand.
What the job involves on each surface
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we’ll tell you before work begins. Sealant won’t put right:
- Sash cords, weights and draught-proofing of the sashes
- Masonry that needs repairing
- Decisions on consent for listed homes
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Colt's Hill
- Timber door frames
- Stone surrounds
- Period & listed homes
- Tenement windows
- Brick reveals
- Sash and case windows
Signs you need sand mastic in Colt's Hill
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Keep an eye out for these signs:
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
- Mastic worn away on windows facing the weather
- A silicone bead on a sash window that spoils the look
In the older streets around Five Oak Green Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Comparing quotes
- What happens if they find a problem under the old sealant
- Which sealant they’ll use, and why
- Is the old sealant removed completely?
- The length of the guarantee
Also near Colt's Hill
Other services in Colt's Hill
Your questions about sand mastic in Colt's Hill
Do you cover Colt's Hill for sand mastic?
Yes, Colt's Hill is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Colt's Hill?
Yes. Colt's Hill is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
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.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Looking after it afterwards
So the new joints stay in good condition:
- Find out about consent before window work on a listed home
- Ask us before painting near the mastic
- Look over the window mastic once a year
- Renew mastic before redecorating the windows
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
Windows and doors in Colt's Hill
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Paddock Wood station, cracked sand mastic around sash windows lets in the draughts tenants complain about. For site and facilities teams at buildings such as Capel Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Colt's Hill is about 4 miles south-east of Tonbridge, in Kent. We carry out sand mastic for householders, landlords and businesses in Colt's Hill and nearby. Colt's Hill is one of 922 places in Kent we cover. We also work in Crawley, around 24 miles away.
Every address in TN12 is within our area for sand mastic. That includes homes and businesses on Colts Hill and Maidstone Road and the roads around them. Neighbouring places we cover for sand mastic include Capel (1 mile west), Five Oak Green (1 mile north), Paddock Wood (1 mile east), Matfield (1 mile south-east) and Whetsted (1 mile north-east). We also work in nearby towns such as Maidstone (10 miles north-east), Sevenoaks (11 miles north-west), Royal Tunbridge Wells (5 miles south-west), Tonbridge (4 miles north-west), Kings Hill (7 miles north) and Foley Park (11 miles north-east).
Local landmarks in Colt's Hill
In Colt's Hill, that means homes and buildings near The Dovecote Inn, Foal Hurst Wood and Mascalls School. The closest station to Colt's Hill is Paddock Wood station, roughly 1.5 miles north-east. Other landmarks nearby include Tonbridge Castle (4.1 miles north-west) and The Hop Farm Museum (2.3 miles north-east). For a walk, there’s Barden Lake and Tudeley Woods RSPB reserve.