Kent · England
Keycol Sand Mastic
Sand mastic across Keycol and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Silicone on a period window that looks wrong
- Cracked mastic round a front door frame
- Draughty sash windows at the surround
Sand mastic for homes and businesses in Keycol
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Like-for-like sand mastic is often the preferred finish. We work on brick reveals, tenement windows and timber door frames, and common reasons people get in touch are gaps round a timber door in stone or brick and window mastic to renew ahead of painting.
Mastic can only go onto a dry, clean joint, so window work in Keycol is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
There’s a 12-month guarantee on every job, large or small.
- Location
- Keycol (ME9)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Take care around the mastic when scraping paint
- Renew mastic before redecorating the windows
- Do not run silicone over sand mastic
- Ask a joiner to look at soft timber first
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
Questions from Keycol
Do you cover smaller places like Keycol?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Does the coastal weather in Keycol affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We’ll explain what to expect before we leave.
Should I check with the council before work on a listed or conservation-area home?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Can tenants book the work?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Is the work guaranteed?
Our 12-month guarantee applies on every job.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we are using and why.
Frames and glazing around Keycol
Keycol is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Borden Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of St Bartholomew, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Keycol is about 2 miles west of Sittingbourne, in Kent. Jobs in Keycol get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Keycol is one of 922 places in Kent where we work. Our Chelmsford page covers work nearby (28 miles or so).
Work in ME9 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Rooks View, Hill Farm View and Rook Lane or anywhere close by, we can help. If you’re just outside Keycol, we cover Bobbing (1 mile east), Chestnut Street (1 mile south), Newington (1 mile west), Danaway (1 mile south-west) and Oad Street (2 miles south). Further out, we also cover Maidstone (9 miles south-west), Gravesend (15 miles north-west), Whitstable (15 miles east), Faversham (9 miles east), Minster (7 miles north-east) and Kings Hill (13 miles south-west).
What’s near Keycol
We work in homes and buildings around Westlands School and George Inn and the streets around them. For rail, the closest station is Newington station, about 1.1 miles west. Nearby you’ll also find Court Hall Museum (1.8 miles east) and Bayford Court (2.3 miles east).
Do you need sand mastic in Keycol?
Timber frames move with the seasons. The movement cracks the mastic over time.
The problems people generally mention when they call include:
- Mastic round period door frames that has failed
- Mastic that needs renewing before redecorating
- Mastic worn away on windows facing the weather
- Cement or filler used on old window joints that has cracked
Letting a property close to Newington station? Then any sash windows need sound mastic to keep draughts and rain out.
Before you book anyone
- What product goes in the joint
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
- Which colour the sealant will be
How we quote for sand mastic
The price is agreed before any work begins. It’s based on:
- Access and height
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
Photos help, but a description is a good start. Please mention:
- A few pictures by email, if you can
- Whether it’s a home or a business
- Whether it has been sealed before
- How we’d reach the joints
Need a quote? Please ring 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Nearby places to Keycol
Also in Keycol
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Landlords and agents in Keycol can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
What happens on the day
At the end, we look at the finished work together. The visit itself usually takes a few hours for a single window, longer for several, depending on how much there is to do. Somewhere like Keycol needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work and give you a clear price.