Surrey · England
Chertsey Sand Mastic
Sand mastic in Chertsey from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps where the frame meets the masonry
- Crumbling sand mastic round a window
- Weathered mastic on the most exposed windows
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Sashes that rattle, stick or won’t open
- Masonry that needs repairing
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Timber door frames
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Tenement windows
- Brick reveals
About our sand mastic in Chertsey
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. Common call-outs are for mastic round period door frames that has failed and silicone on a period window that looks wrong, across timber door frames, sash and case windows and tenement windows.
Houses in smaller places like Chertsey can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Chertsey (KT16, KT15)
- Wider area
- Surrey
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Also in Chertsey
Why deal with it now?
New sash windows are a major, costly change, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Homes in smaller places like Chertsey can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
What you get with us
- Anti-fungal sanitary silicone in wet areas
- Old sealant always removed completely
- An ARBOMaster approved applicator
- A 12-month guarantee on all work
Take a look at what affects the cost or what customers say.
Quotes for sand mastic in Chertsey
Jobs vary more than people expect. What affects the quote:
- Which sealant suits the joint
- The size of the job
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- The type of property
- If someone has resealed it before
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved and give you a clear quote.
Questions from Chertsey
Is Chertsey in your area for sand mastic?
Yes, Chertsey is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
I let a flat near Chertsey station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. If you’re redecorating the window, ask us first and we’ll talk you through it.
What does sand mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Do the sealants smell?
Some sealants have a smell while they cure. Opening a window helps.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
Looking after it afterwards
After the cure time, these simple habits help:
- Check the mastic when you check the paintwork
- Ask us before painting near the mastic
- Find out about consent before window work on a listed home
- Sort the mastic before the decorators arrive
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Chertsey homes and the weather
With historic houses such as Botleys Mansion (about 1.5 miles south-west) nearby, there’s older building stock in the area around Chertsey as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
If you let a flat or house near Chertsey station, older sash windows in a rental need their mastic kept sound to keep the weather out. If you look after a building such as St Anne's Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s. Homes close to Church of St Peter include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Chertsey is about 6 miles north-east of Woking, in Surrey. Across the KT16 area, we can carry out sand mastic at your property. 395 places in Surrey are on our list. You can also see our page for London, about 19 miles away.
Every address in KT16 and KT15 is within our area for sand mastic. If you need sand mastic at a property on Station Road, Charles Street and King Street or a nearby road, we can help. You’ll find Chertsey on the A317 and A320, so it’s easy for us to get to with everything needed for sand mastic. Nearby, we also carry out sand mastic in Lyne (1 mile west), Row Town (2 miles south), Ottershaw (2 miles south-west), Trumps Green (3 miles west) and Stonehill (3 miles south-west). We also work in nearby towns such as Guildford (10 miles south), Woking (6 miles south-west), Camberley (10 miles west), Epsom (11 miles east), Ewell (11 miles east) and Egham (3 miles north-west).
Around Chertsey
We work in homes and buildings around Chertsey High School, Sir William Perkins's School and Woburn Park. There’s a railway station in Chertsey itself: Chertsey station. Nearby you will also find Runnymede Hospital (1 mile south-west) and Spelthorne Museum (3.2 miles north). Open spaces near Chertsey include St Ann's Hill and Gracious Pond.
The process
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself generally takes a few hours for a single window, longer for several, depending on the amount of work. In a smaller place like Chertsey, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- 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.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
Getting a quote
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Read more
Landlords, agents and businesses in Chertsey
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.