Slough · England
Sand mastic for sash & case windows in Upton, Slough
Problem with your window and door surrounds in Upton? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Weathered mastic on the most exposed windows
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
About our sand mastic in Upton
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. If you’re dealing with cracked mastic round a front door frame and silicone on a period window that looks wrong, we can help.
In a smaller place like Upton, 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.
Our work is backed for twelve months, in Upton and everywhere else we cover.
- Where
- Upton (SL1, SL3, SL2)
- Region
- Slough
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. Expect the work to take a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. A visit to Upton is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Related advice
What we cannot put right
It helps to know what we cannot do:
- Sash cords, weights and draught-proofing of the sashes
- Cracked or broken glass
- Crumbling stone or brickwork round the window
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
What we seal
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
- Period & listed homes
- Timber door frames
Different surfaces, different methods
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is generally favoured.
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. It’s renewed by hand.
Aftercare tips
Good habits help new joints last longer. A few tips:
- Avoid heavy scraping on the mastic joint
- Ask us before painting near the mastic
- Clear gutters so water doesn’t pour onto the windows
- Inspect the joints round the windows every year or so
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look before trying a quick fix.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber and timber that stays wet can rot.
Why act early in Upton
New sash windows are a major, costly change and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. Around Upton, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
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 play a part, and we will explain the quote if you ask.
Why choose Mr Mastic in Upton
- ARBOMaster approved applicator
- More than 20 years in sealant work
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
Take a look at our cost guide and customer reviews.
Nearby places to Upton
What else we do in Upton
Quotes for sand mastic in Upton
Your quote is based on your job. We take into account:
- Whether old sealant or filler has to be cut out
- Access and height
- Working hours on commercial sites
- Mould in or behind the old joints
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- A few pictures by email, if you can
- The rough size of the job
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear price before work begins.
Questions from Upton
Do you work for landlords with property near Slough station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Can you do sand mastic in Upton?
Yes. Our work covers London and the South East, and Upton is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
Do you do commercial work?
Yes. We can plan bigger jobs in stages.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do the sealants smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
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.
Can I paint the new mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Signs you need sand mastic in Upton
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
People normally contact us after spotting one of these:
- Weathered mastic on the most exposed windows
- Gaps where the frame meets the masonry
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
Schools such as St Mary's Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Whether you can choose the colour
- What preparation is included
- How long to leave it before use
- What happens if the job turns out different
Windows and doors in Upton
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. Historic houses like Windsor Castle (about 1.5 miles south-west) are a reminder that the area around Upton 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.
Homes close to Church of St Laurence include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Slough station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Upton is about 1 mile south-east of Slough, in Slough. Upton gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Slough coverage runs to 31 places, and Upton is one of them. Our Reading page covers work nearby (17 miles or so).
Jobs for sand mastic in SL1, SL3 and SL2 works the same way as everywhere else we cover. Sand mastic is available to properties on Mere Road, Upton Road and High Street. Main roads around Upton include the M4 and A332, which makes travel easy. Other places close to Upton include Middlegreen (2 miles east), Langley (2 miles east), George Green (2 miles north-east), Wexham Court (2 miles north) and Wexham Street (3 miles north). Further out, we also cover Britwell (3 miles north-west), Burnham (3 miles north-west), Stoke Poges (3 miles north), Huntercombe (3 miles north-west), Farnham Common (4 miles north) and Farnham Royal (3 miles north-west). Upton is among the bigger towns we cover in Slough.
What’s near Upton
In Upton, that means homes and buildings near The Red Cow Public House, Upton Court Grammar School and Long Close School, among other places. The closest station to Upton is Slough station, about 0.6 miles north of the centre. Well-known places in the area include Windsor Castle (1.5 miles south-west) and Museum of Eton Life (1.2 miles south-west). For a walk, there’s Stoke Common and Taplow Lake.