Windsor and Maidenhead · England
Sand Mastic in Sunningdale
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Sunningdale. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps round a timber door in stone or brick
- Old cement repairs round a window that have failed
- Wind and rain getting in round a sash window
Sand mastic in Sunningdale, done properly
Sand mastic doesn’t last for ever, leaving gaps round the window. Renewing it closes the gap and tidies the surround. Typical jobs include weathered mastic on the most exposed windows and draughts and rain around sash boxes, on brick reveals, tenement windows and period & listed homes.
Around Sunningdale, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows, and any older timber or sash windows need a sealant that suits them.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or drop us an email.
- Location
- Sunningdale (SL5)
- Region
- Windsor and Maidenhead
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Windows and doors in Sunningdale
With historic houses such as St Leonard's Hill (about 4.8 miles north) nearby, there’s older building stock in the area around Sunningdale 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Sunningdale station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Holy Trinity CofE Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Sunningdale is about 4 miles south-west of Egham, in Windsor and Maidenhead. Across the SL5 area, we cover sand mastic for homes and businesses. Across Windsor and Maidenhead, we cover 57 places, and Sunningdale is one of them. You can also see our page for Reading, roughly 15 miles from Sunningdale.
We cover every part of SL5 for sand mastic and the streets around it. Streets in the area include Station Road, High Street and Church Road. Main roads around Sunningdale include the B383, which makes travel easy. We also cover Broomhall (1 mile south-east), South Ascot (1 mile west), Brick Hill (2 miles south), Windlesham (2 miles south) and Chobham (4 miles south-east). Further out, we also cover Maidenhead (9 miles north-west), Windsor (5 miles north), Boyn Hill (9 miles north-west), North Ascot (3 miles north-west), Cookham (12 miles north) and Furze Platt (10 miles north-west).
Near you in Sunningdale
We work in homes and buildings around Sunningdale School, Charters School and Silwood Park, among other places. The nearest railway station is Sunningdale station, about 0.5 miles south of the centre. Well-known places in the area include Heatherwood Hospital (2.3 miles west) and Chobham Museum (3.9 miles south). For a walk, there’s Virginia Water Lake and Gracious Pond.
When it isn’t the sealant
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Crumbling stone or brickwork round the window
- Planning or listed building consent (your local planning authority decides)
- Cracked or broken glass
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before you book.
Surfaces we seal
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
- Timber door frames
- Period & listed homes
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
How it works
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Parking around Sunningdale is usually 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 agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
Ask for a quote
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before work begins.
Advice
What we are called out for in Sunningdale
Timber swells and shrinks with the weather. The movement cracks the mastic over time.
The most common problems we see are:
- Tired mastic found when preparing windows for paint
- Patchy fillers round a sash window
- Draughty sash windows at the surround
- Old sand mastic that has cracked, crumbled or fallen out
In the older streets around Holy Trinity Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before booking anyone
- What the cure time is
- Whether VAT is included
- Who does the work, and how experienced they are
- Whether they’re fully insured
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
What affects the cost of sand mastic
For a quick quote, just ask. The main things that affect it are:
- How easy the joints are to reach
- Which sealant suits the joint
- Any mould that needs treating
- When we can work, for business premises
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- Whether it has been sealed before
- Whether it’s a home or a business
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Places near Sunningdale
More services for Sunningdale
FAQs for Sunningdale
Is Sunningdale in your area for sand mastic?
Yes, Sunningdale is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll send you a clear quote.
I let a flat near Sunningdale station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Can I choose the sealant colour?
In most cases you can choose. We will tell you which colours the right product comes in.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Where are you based?
We work from Crawley. Our applicators cover Sunningdale, along with the rest of our area.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Should I check with the council before work on a listed or conservation-area home?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Leave it or put it right?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. In a smaller place like Sunningdale, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Why Sunningdale clients choose us
- 20+ years of sealant experience
- Tidy, careful work
- Full insurance on every job
- Every job guaranteed for a year