Windsor and Maidenhead · England
Sunninghill Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Sunninghill. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
- Draughts and rain around sash boxes
Sand mastic for homes and businesses in Sunninghill
A silicone bead around a sash window can look out of place and isn’t always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. If you have mastic dropping out of the joint and old cement repairs round a window that have failed, we can help.
In smaller places like Sunninghill, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
Every job is covered by a 12-month guarantee, wherever you are in Windsor and Maidenhead.
- Place
- Sunninghill (SL5)
- Wider area
- Windsor and Maidenhead
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- 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 explain the cure time before we leave. For a job in Sunninghill, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- Mention any parking rules near the property
Get a quote
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Advice
What happens if it’s left?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and blends with the stone or brick. Homes in smaller places like Sunninghill 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.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- Sanitary silicone with an anti-fungal additive in wet areas
- 20+ years of sealant experience
- Experience in homes, commercial sites and hotels
- Any old sealant cut out fully, not covered over
See our cost guide and what customers say.
When it is not the sealant
To be straight with you, there are a few things sealant will not fix:
- Broken panes
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sash cords, weights and draught-proofing of the sashes
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Tenement windows
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
Landlord and commercial work in Sunninghill
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Towns and villages near Sunninghill
What else we do in Sunninghill
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Don’t run silicone over sand mastic
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
- Renew mastic before redecorating the windows
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Frames and glazing around Sunninghill
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as St Leonard's Hill (about 4.6 miles north) nearby, there’s older building stock in the area around Sunninghill as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as St Michael's CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around Church of St Michael and All Angels, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Sunninghill is about 4 miles east of Bracknell, in Windsor and Maidenhead. Whether you’re in the middle of Sunninghill or further out, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Sunninghill is one of 57 towns and villages in Windsor and Maidenhead we cover. We also work in Reading, about 14 miles from Sunninghill.
We cover every part of SL5 for sand mastic. Sand mastic is available to properties on High Street, London Road and School Road and the roads around them. If you’re just outside Sunninghill, we cover Ascot (1 mile north-west), Beggar's Bush (1 mile east), Cheapside (1 mile north), Blacknest (1 mile east) and North Ascot (2 miles north-west). We also work in nearby towns such as Maidenhead (9 miles north), Windsor (5 miles north), Boyn Hill (8 miles north-west), Cookham (11 miles north), Furze Platt (10 miles north) and Dedworth (5 miles north).
Around Sunninghill
In Sunninghill, that means homes and buildings near St Mary's School, Charters School and Silwood Park and the streets around them. The closest station to Sunninghill is Ascot station, roughly 1 mile west of the centre. Well-known places in the area include Heatherwood Hospital (1.5 miles north-west). Open spaces near Sunninghill include Virginia Water Lake and Gracious Pond.
Sunninghill: your questions answered
Can you help a landlord with a rental near Ascot station?
Yes. We work for landlords and agents as well as homeowners. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Will you come out to Sunninghill?
Yes, Sunninghill is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
How long does the job take?
Typically it takes a few hours per window, depending on the condition of the joints. Bigger jobs take longer, and we will say how long yours will take.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Should I use sand mastic or silicone?
Sand mastic generally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.
How the job changes by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Signs you need sand mastic in Sunninghill
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
If you can see any of these, it’s time to have the joints looked at:
- Patchy fillers round a sash window
- Mastic dropping out of the joint
- Draughty sash windows at the surround
- Window mastic to renew ahead of painting
If you let a flat or house near Ascot station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- Whether they seal over old material or remove it
- Is VAT in the price?
- What the cure time is
- Who turns up on the day