Windsor and Maidenhead · England
Sand Mastic in Clewer
We cover Clewer for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Mastic dropping out of the joint
- Gaps where the frame meets the masonry
- Patchy fillers round a sash window
Sand mastic for homes and businesses in Clewer
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. Common call-outs are for silicone on a period window that looks wrong and mastic round period door frames that has failed, across stone surrounds, period & listed homes and timber door frames.
In a smaller place like Clewer, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. That is hard on the mastic around frames and sills.
We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.
- Location
- Clewer (SL4)
- Region
- Windsor and Maidenhead
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Clewer homes and the weather
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Windsor Castle (about 1 mile east) are a reminder that the area around Clewer 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.
For an older house near a landmark such as Church of St Andrew, the joint between an old wall and a newer frame is generally the first place rain gets in. For landlords with property near Windsor & Eton Central station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Clewer is about 1 mile north of Windsor, in Windsor and Maidenhead. Jobs in Clewer get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Windsor and Maidenhead, we cover 57 places, and Clewer is one of them. Reading is on our list too, around 15 miles away.
Jobs for sand mastic in SL4 works the same way as everywhere else we cover. Streets in the area include Oak Lane, Vale Road and Mill Lane, and we cover them all. You’ll find Clewer on the A308 and A332, which makes it straightforward to reach with everything needed for sand mastic. Close by, we work in Windsor (1 mile south), Eton (1 mile north-east), Eton Wick (1 mile north-west), Boveney (1 mile west) and Dedworth (1 mile south-west). Within a short drive, we also cover Maidenhead (5 miles north-west), Boyn Hill (5 miles west), North Ascot (5 miles south-west), Cookham (7 miles north-west), Furze Platt (6 miles north-west) and Broomhall (6 miles south).
Landmarks near Clewer
Locally, jobs take us to homes and businesses close to The Windsor Boys' School, The Windsor Boys' School and The Vansittart Arms. The closest station to Clewer is Windsor & Eton Central station, about 0.7 miles east. A little further out are Museum of Antiquities (0.7 miles north-east) and King Edward VII Hospital (1 mile south-east). For a walk, there’s Taplow Lake and Bray Pit.
Do you need sand mastic in Clewer?
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint, and they generally need raking out.
The problems people normally mention when they call include:
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
- Patchy fillers round a sash window
- Mastic dropping out of the joint
If you look after a building such as St Edward's Catholic First School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- What the cure time is
- Which colour the sealant will be
- What the quote includes, VAT included or not
- Who does the work, and how experienced they are
Landlords, agents and businesses in Clewer
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
For anyone letting property in or around Clewer, several properties can go on one quote. Send us the addresses and the work at each.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Questions from Clewer
Do you cover Clewer for sand mastic?
Yes. We work across London and the South East, and Clewer is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Do you work for landlords with property near Windsor & Eton Central station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we are fully insured.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you’re redecorating the window, ask us first and we will advise.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later, and we’ll tell you what to expect.
How much does sand mastic cost in Clewer?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
More services for Clewer
Leave it or put it right?
If you are redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Homes in smaller places like Clewer can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- We leave the area clean and tidy
- Any old sealant cut out fully, not covered over
- Over 20 years’ experience
- 180+ five-star Google reviews
The process
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours per window, depending on the condition of the joints. Parking around Clewer is normally 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.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
Getting a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear price before we start.
Read more
What affects the cost of sand mastic
We do not publish a price list, because jobs vary so much. The quote depends on:
- The product the joint needs
- Mould in or behind the old joints
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
The cost depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
Photos help, but a description is a good start. Please mention:
- Where the property is
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.