South East England and London

Sand Mastic in Kent

Sand mastic in all 922 towns and villages of Kent, with every joint properly prepared, quoted clearly before any work starts and a one-year guarantee.

Sand Mastic in Kent

Call 0345 464 0079

Get a quick quote

Sand mastic across Kent

Traditional burnt sand mastic around sash and case windows and doors in stone and brick. Pick your town below to see the details for your area, and call or email us for a quick quote.

Main towns

Sand mastic across Kent: what to expect

Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on stone surrounds, brick reveals and sash and case windows, and common reasons people get in touch are gaps round a timber door in stone or brick and a silicone bead on a sash window that spoils the look.

Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a single window, longer for several.

First we agree which joints need doing.
Old mastic and any loose material are raked out.
Deep gaps are packed so the mastic sits at the right depth.
We apply the mastic by hand and shape it.
The surface is finished to suit the stone or brick.

What you will pay

There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.

Why choose Mr Mastic

Approved under the ARBOMaster scheme
Trusted Arbo and Everbuild sealants
4.9 on Google from 180+ five-star reviews
We leave the area clean and tidy

Ask for a quote

To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.

Landmarks near Maidstone

Typical jobs here are in homes near Paper Makers Arms, Maidstone Grammar School and St Philip's Church, among other places. Also close by are River Len LNR (within half a mile north-east), South Borough Primary School (under half a mile south) and St Augustine Academy (1.2 miles west). Maidstone’s nearest station is Maidstone West station, about 0.6 miles north-west. Nearby you’ll also find Maidstone Carriage Museum (within half a mile north-west) and Oakwood Hospital (1.8 miles west). Open spaces near Maidstone include Burham Down and Boxley Hills.

Windows and doors across Kent

In Kent, sand mastic work takes in houses, flats, conservatories and commercial glazing, from Maidstone, Ashford and Canterbury to the quieter places in between. Outside sealant needs a dry, clean joint, so the work is planned around the weather.

Hard water across most of the South East leaves limescale on sealant, grout and fittings. Whatever the job in Kent, surfaces are cleaned back properly before new sealant goes in. In the coastal parts of Kent, the sea-facing side of a building takes the most weather, so they’re often the first to fail. Good preparation and the right sealant help it cope.

Maidstone: In the older streets around St Philip's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you look after a building such as South Borough Primary School, its window and door frames need their mastic kept sound, just like a home’s.

How the job changes by surface

Timber door frames

Round a period front door, sand mastic gives the right look.

Tenement and terrace windows

Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.

What sealant work can’t fix

We’d rather tell you now than do work that will not last, so these are the limits:

Masonry that needs repairing
Putty and glazing repairs
Decayed frames that need repair

Why it fails

Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber and we normally remove them.

If you can see any of these, it’s time to have the joints looked at:

Window mastic to renew ahead of painting
Wind and rain getting in round a sash window
Mastic worn away on windows facing the weather
Mastic round period door frames that has failed

Work for landlords, hotels and businesses

We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.

Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.

DIY versus a professional finish

Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.

Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.

Kent: your questions answered

Do I have to be there?

It depends on the job. Inside work needs someone to give us access.

Do I need permission for sand mastic on a listed building?

Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.

What exactly is sand mastic?

Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.

How long will you be here?

That depends on the amount of work, but as a guide it takes a few hours per window, depending on the condition of the joints. We will tell you when we quote.

Which is right for my windows, sand mastic or modern sealant?

That depends on your windows. Period windows in stone or brick usually suit sand mastic, while modern frames normally get a flexible sealant.

Are you insured?

Yes. We are fully insured for every job we do.

Is it worth trying it myself?

Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.