Kent · England
Sand mastic for sash & case windows in Windmill Hill, Kent
Professional sand mastic in and around Windmill Hill, with old sealant always removed completely and a 12-month guarantee.
- A silicone bead on a sash window that spoils the look
- Mastic worn away on windows facing the weather
- Window mastic to renew ahead of painting
Sand mastic for homes and businesses in Windmill Hill
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. If you’re dealing with draughts and rain around sash boxes and crumbling sand mastic round a window, we can help.
Houses in smaller places like Windmill Hill 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.
- Location
- Windmill Hill (DA12, DA11)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When it is not the sealant
We will always be straight with you, so here’s what sealant cannot fix:
- Planning or listed building consent (your local planning authority decides)
- Putty and glazing repairs
- Damaged stone surrounds
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Stone surrounds
- Sash and case windows
- Brick reveals
- Timber door frames
- Tenement windows
- Period & listed homes
Also near Windmill Hill
Other services in Windmill Hill
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for a single window, longer for several. Parking around Windmill Hill is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Tell us if parking is tricky
- Mention any sign-in or site rules at work premises
- Clear the area around the work
How to get a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Read more
Leave it or put it right?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. In a smaller place like Windmill Hill, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Doing several joints on one visit generally makes better use of the time than several visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Windmill Hill
- Rated 4.9 stars on Google
- Arbo and Everbuild products
- Anti-fungal sanitary silicone in wet areas
- Every job guaranteed for a year
Read what affects the cost and customer reviews.
Windmill Hill homes and the weather
Windmill Hill is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Wrotham Road Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Gravesend station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as Christ Church Milton, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Windmill Hill is about 1 mile north-west of Gravesend, in Kent. We carry out sand mastic for homeowners, landlords and businesses in Windmill Hill and nearby, as part of our work across Kent. Across Kent, we cover 922 places, Windmill Hill among them. For nearby work, see our London page, about 21 miles away.
All of DA12 and DA11 is covered for sand mastic. We cover properties on New Road, Sun Lane and Joy Road. Windmill Hill sits on or near the A227, so getting to you is simple. Close by, we work in Gravesend (1 mile south-east), Milton-next-Gravesend (1 mile north-east), Denton (1 mile east), Northfleet (1 mile west) and Painters Ash (2 miles south-west). Within a short drive, we also cover Maidstone (13 miles south-east), Dartford (6 miles west), Sevenoaks (13 miles south-west), Swanley (9 miles west), Kings Hill (11 miles south) and Foley Park (13 miles south-east).
What’s near Windmill Hill
We work in homes and buildings around St John's Catholic Comprehensive, Mayfield Grammar School and The Waterloo Public House. The closest station to Windmill Hill is Gravesend station, roughly 0.5 miles north-west. A little further out are Gravesham Museum (0.5 miles north) and Stone Castle (4.1 miles west). Open spaces near Windmill Hill include Sawyers Lake and Gad's Hill.
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Avoid heavy scraping on the mastic joint
- Make sure water runs off the sill
- Do not paint over the new mastic
- Ask the planning authority about consent for listed or conservation-area homes
Do not touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
For landlords and businesses
For anyone letting property in or around Windmill Hill, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
How we quote for sand mastic
Your quote is based on your job. We look at:
- How much old sealant there is and how hard it is to remove
- The type of sealant required
- Access and height
- The amount of work
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. We give a clear quote before any work starts, so you know where you stand.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- How many joints, rooms or windows are involved
- The type of property
- The address or postcode of the job
- The problem you’ve noticed
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Different surfaces, different methods
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Period and listed homes
Period homes look their best with traditional materials.
Windmill Hill questions
Do you work for landlords with property near Gravesend station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Is Windmill Hill within the area you cover?
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.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we are done.
Can I add another job to the visit?
Yes. Just list everything you need and we’ll quote it together.
Which is right for my windows, sand mastic or modern sealant?
We’ll help you decide. Sand mastic suits many period homes and newer frames suit modern sealant.
Can I choose the sealant colour?
Generally, yes. White, clear and grey are common, and other colours are available, and we will agree it with you first.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Are you insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.