Kent · England
Hartlip Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Hartlip, backed by a one-year guarantee. Call for a quick quote.
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
- Gaps between timber frames and stone or brick
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Putty and glazing repairs
- Sashes that rattle, stick or will not open
- Masonry that needs repairing
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before booking.
Surfaces we seal
- Tenement windows
- Timber door frames
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Brick reveals
Sand mastic for homes and businesses in Hartlip
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties where a modern sealant bead would stand out. If you have mastic worn away on windows facing the weather and modern sealant on a period surround, we can put it right.
Mastic can only go onto a dry, clean joint, so window work in Hartlip is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
You get a one-year guarantee, the same in Hartlip as everywhere else we work.
- Location
- Hartlip (ME9)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
At the end, we look at the finished work together. The work normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. Somewhere as small as Hartlip, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Clear items away from the joints we are working on
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
Getting a quote
Asking for a quote is easy: let us know what needs doing and where and its rough size. Photos by email help us understand the job.
Read more
Different surfaces, different methods
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Period and listed homes
Many older homes were built with sand mastic round the windows. If your home is listed, ask your local planning authority about consent.
Frames and glazing around Hartlip
Hartlip is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around older windows and doors, especially on the side facing the sea. 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.
If you look after a building such as Hartlip Endowed Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to Church of St Michael include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Hartlip is about 3 miles south-east of Gillingham, in Kent. Jobs in Hartlip get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Hartlip is one of 922 places in Kent where we work for sand mastic. You can also see our page for Chelmsford, roughly 28 miles from Hartlip.
Here we cover the ME9 postcode area for sand mastic. You will find streets such as The Street, Dane Close and Place Lane, and we cover them all. We also cover the places around Hartlip: Lower Hartlip (1 mile east), Moor Street (1 mile north-west), Breach (1 mile north-east), Meresborough (1 mile west) and Newington (1 mile east). Further out, we also cover Maidstone (7 miles south-west), Sittingbourne (4 miles east), Gravesend (13 miles north-west), Faversham (11 miles east), Northfleet (14 miles north-west) and Minster (9 miles north-east).
Around Hartlip
Typical jobs here are in homes near Leigh Academy Rainham and Foxburrow Wood and the streets around them. The nearest railway station is Newington station, roughly 1.3 miles east. Other landmarks nearby include Bayford Court (4.5 miles east) and Medway Maritime Hospital (4.8 miles north-west). For a walk, there’s Detling Hill and Bishop Saltings.
What affects the quote in Hartlip
We quote each job individually. These are the things that affect it:
- The number of rooms or windows
- Which sealant suits the joint
- Whether the work is at height
- The number and length of the joints
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- Pictures of the joints, sent by email
- How we’d reach the joints
- Where the property is
- Whether it’s a home or a business
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
More services for Hartlip
What we’re called out for in Hartlip
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint.
The most common problems we see are:
- Draughty sash windows at the surround
- Modern sealant on a period surround
- Cracked mastic round a front door frame
- Gaps between timber frames and stone or brick
For landlords with property near Newington station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Before you book anyone
- What preparation is included
- Who turns up on the day
- What product goes in the joint
- What insurance they hold
Your questions about sand mastic in Hartlip
Is Hartlip within the area you cover?
Yes. Hartlip is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Newington station?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Can sand mastic be painted?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant, and we will explain why.
Do you have insurance?
Yes. Full insurance covers our work.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Get any rot dealt with first
- Renew mastic before redecorating the windows
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
Avoid painting over the new mastic, as traditional guidance advises. Ask us before any decorating around it.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.