Windsor and Maidenhead · England
Sand mastic for sash & case windows in Broomhall, Windsor and Maidenhead
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Broomhall. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Silicone on a period window that looks wrong
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
About our sand mastic in Broomhall
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we will advise if you’re redecorating. If you have wind and rain getting in round a sash window and mastic dropping out of the joint, we can help, on sash and case windows, timber door frames and period & listed homes alike.
Around Broomhall, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
A one-year guarantee comes as standard.
- Location
- Broomhall (SL5)
- Region
- Windsor and Maidenhead
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we’ll confirm what’s needed.
Also near Broomhall
What else we do in Broomhall
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
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.
What happens on the day
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours for a single window, longer for several. In a smaller place like Broomhall, 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.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Related advice
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Cracked or broken glass
- Sashes that rattle, stick or won’t open
- Masonry that needs repairing
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Surfaces we seal
- Tenement windows
- Period & listed homes
- Timber door frames
- Stone surrounds
- Sash and case windows
- Brick reveals
Signs you need sand mastic in Broomhall
Timber frames move with the seasons. The movement cracks the mastic over time.
Any of these means the joints need attention:
- Old sand mastic that has cracked, crumbled or fallen out
- Cracked mastic round a front door frame
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
Managing a site like Sunningdale School? Then the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- Are they insured?
- Whether they seal over old material or remove it
- Is VAT in the price?
- Which sealant they’ll use, and why
Looking after it afterwards
To keep the joints looking good and working properly:
- Avoid heavy scraping on the mastic joint
- Ask a joiner to look at soft timber first
- Clear gutters so water does not pour onto the windows
- Sort the mastic before the decorators arrive
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Common questions in Broomhall
Do you work for landlords with property near Sunningdale station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Is Broomhall in your area for sand mastic?
Yes. Our work covers London and the South East, and Broomhall is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
Is it possible to take out silicone and use sand mastic instead?
Usually, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Windows and doors in Broomhall
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. Historic houses like Botleys Mansion (about 4.4 miles east) are a reminder that the area around Broomhall has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Rented homes near Sunningdale station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. If you live in an older home near Holy Trinity Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Broomhall is about 4 miles south-west of Egham, in Windsor and Maidenhead. We provide sand mastic to homeowners, landlords and businesses in Broomhall and the surrounding area. Our Windsor and Maidenhead coverage runs to 57 places, and Broomhall is one of them. There’s also a page for Reading, roughly 15 miles from Broomhall.
We work across the SL5 postcode area for sand mastic. If you need sand mastic at a property on London Road, Abbey Wood and Cedar Drive or a nearby road, our applicators can take on the job. We also cover the places around Broomhall: Sunningdale (1 mile north-west), Brick Hill (1 mile south), South Ascot (2 miles west), Windlesham (2 miles south-west) and Chobham (3 miles south-east). We also work in nearby towns such as Maidenhead (10 miles north-west), Windsor (6 miles north), Boyn Hill (9 miles north-west), North Ascot (3 miles north-west), Cookham (12 miles north) and Furze Platt (11 miles north-west). Broomhall is among the bigger towns we cover in Windsor and Maidenhead.
Near you in Broomhall
Locally, jobs take us to homes and businesses close to Charters School, Silwood Park and Holy Trinity CofE Primary School, among other places. Broomhall has its own railway station: Sunningdale station. Nearby you’ll also find Chobham Museum (3.3 miles south) and Heatherwood Hospital (2.7 miles north-west). For a walk, there’s Gracious Pond and Virginia Water Lake.