Surrey · England
Sand mastic for sash & case windows in Leatherhead, Surrey
Sand mastic for Leatherhead and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Tired mastic found when preparing windows for paint
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
Sand mastic in Leatherhead
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. We work on timber door frames, tenement windows and stone surrounds, and people most often call us about old cement repairs round a window that have failed and crumbling sand mastic round a window.
Plenty of homes in a town like Leatherhead have had conservatories, patio doors or new windows added over the years. Every addition brings more joints, each wearing at its own pace. Leaks normally start at a sill, a frame head or a glazing joint.
You get a one-year guarantee, the same in Leatherhead as everywhere else we work.
- Location
- Leatherhead (KT22)
- Wider area
- Surrey
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
If you manage several properties in or around Leatherhead, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Nearby places to Leatherhead
Also in Leatherhead
How it works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several, and the area is left clean. For a job in Leatherhead, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
Getting a quote
Want a quote for sand mastic? Please call 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Ask a joiner to look at soft timber first
- Avoid patching sand mastic with silicone
- Renew mastic before redecorating the windows
- Ask the planning authority about consent for listed or conservation-area homes
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Common questions in Leatherhead
Is Leatherhead in your area for sand mastic?
Yes, Leatherhead is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Do you work for landlords with property near Leatherhead station?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Can you match the sealant colour?
Most of the time, yes. We’ll explain which colours are available and agree one before work begins.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
What we are called out for in Leatherhead
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint and we normally remove them.
Signs it’s time to call us include:
- Failed mastic on an exposed elevation
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
- Silicone on a period window that looks wrong
Rented homes near Leatherhead station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Which sealant they’ll use, and why
- What the cure time is
- Which colour the sealant will be
- What the quote includes, VAT included or not
Quotes for sand mastic in Leatherhead
There’s no set price list, because jobs vary so much. The quote depends on:
- Whether the work is at height
- The size of the job
- The number of rooms or windows
- The type of sealant required
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Asking for a quote
You don’t need to know the technical terms. Just tell us:
- If someone has resealed it before
- Any access issues, like height or stairs
- The problem you’ve noticed
- The type of property
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, call 0345 464 0079 or send us an email.
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Frames and glazing around Leatherhead
Historic houses like Polesden Lacey (about 3.4 miles south-west) are a reminder that the area around Leatherhead has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
For site and facilities teams at buildings such as Leatherhead Trinity School and Children's Centre, the mastic around its windows and doors needs looking after like any other building’s. Homes close to Church of Our Lady and St Peter include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Leatherhead is about 4 miles south-west of Epsom, in Surrey. We carry out sand mastic for homes and businesses in Leatherhead and nearby, as part of our work across Surrey. Leatherhead is one of 395 places in Surrey we cover. Crawley is on our list too, about 14 miles from Leatherhead.
Every address in KT22 is covered for sand mastic, from the main roads to the quietest streets. Whether your property is on High Street, Church Road and Station Road or a nearby road, we can help. Main roads around Leatherhead include the A24 and A245, so getting to you is simple. Neighbouring places we cover for sand mastic include Fetcham (1 mile west), Mickleham (2 miles south), Great Bookham (2 miles south-west), Westhumble (3 miles south) and Little Bookham (3 miles south-west). Larger places within reach include Guildford (11 miles west), Woking (11 miles west), Epsom (4 miles north-east), Horley (11 miles south-east), Redhill (8 miles south-east) and Ewell (5 miles north-east).
What’s near Leatherhead
In Leatherhead, that means homes and buildings near St Andrew's Catholic School, St Andrew's Catholic School and Duke's Head Public House. There’s a railway station in Leatherhead itself: Leatherhead station. Other landmarks nearby include Walton on the Hill (3.5 miles east) and Headley Court (2.2 miles east). Open spaces near Leatherhead include Claremont Lake and Jubilee Wood.
What happens if it’s left?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. In a family home in Leatherhead, a failed seal around a bath or a frame lets water into places you can’t see, such as under the floor, behind a panel or into a wall. Left alone, that means rot, damp and a bigger repair.
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear quote for the lot.
What you get with us
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- 20+ years of sealant experience
- Fully insured
See our cost guide or what customers say.