Greater London · England
Sand mastic for sash & case windows in Hayes, Greater London
Specialist sand mastic for Hayes: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Weathered mastic on the most exposed windows
- Gaps between timber frames and stone or brick
- Silicone on a period window that looks wrong
What we do, step by step
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours per window, depending on the condition of the joints, depending on how much there is to do. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
- Let us know if you’ve seen damp or leaks
Get a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we’ll take it from there.
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Sand mastic in Hayes
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditionally, sand mastic is left unpainted, so ask us before you decorate. We work on tenement windows, period & listed homes and sash and case windows, and the jobs we see most are window mastic to renew ahead of painting and old cement repairs round a window that have failed.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Hayes is something to talk through when you book.
Our work is backed for twelve months.
- Location
- Hayes (UB3, UB4, UB8, UB10)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we’re called out for in Hayes
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Signs it’s time to call us include:
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
Letting a property close to Hayes & Harlington station? Then any sash windows need sound mastic to keep draughts and rain out.
Questions to ask before booking
- What happens if the job turns out different
- What product goes in the joint
- How much experience the applicator has
- How the colour is chosen
What sealant work cannot fix
It helps to know what we cannot do:
- Whether work needs listed building consent
- Decayed frames that need repair
- Sashes that need overhauling
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in Hayes
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Timber door frames
- Brick reveals
- Tenement windows
What the job involves on each surface
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
Hayes homes and the weather
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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
Hayes is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. In the older streets around Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Hayes is about 8 miles east of Slough, in Greater London. Hayes gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Greater London coverage runs to 764 places, and Hayes is one of them. For nearby work, see our London page, about 14 miles away.
Here we cover the UB3, UB4, UB8 and UB10 postcode area for sand mastic. We cover properties on Church Road, Drenon Square and Townfield Square and the roads around them. Main roads around Hayes include the A312, which makes travel easy. We also cover the places around Hayes: Hillingdon (2 miles north-west), Yiewsley (2 miles west), West Drayton (2 miles west), Cowley (3 miles west) and Uxbridge (3 miles north-west). Larger places within reach include London (14 miles east), City of Westminster (12 miles east), Marylebone (12 miles east), Kensington (9 miles east), St Pancras (13 miles east) and Shoreditch (15 miles east).
Landmarks near Hayes
Locally, jobs take us to homes and businesses close to Dr Triplett's CofE Primary School, Rosedale College and Barra Hall Park and the streets around them. For rail, the closest station is Hayes & Harlington station, roughly 0.9 miles south. Nearby you’ll also find Hillingdon Museum and Archives Services (3.2 miles north-west) and Hayes Cottage Hospital (within half a mile north). Open spaces near Hayes include Middle Lake and Yeading Brook Meadows.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Looking after it afterwards
After the cure time, these simple habits help:
- Go gently near the mastic when preparing windows
- Ask a joiner to look at soft timber first
- Inspect the joints round the windows every year or so
- Avoid patching sand mastic with silicone
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Also in Hayes
What affects the cost of sand mastic
Every job gets its own quote. This is what makes a difference:
- The size of the job
- How many rooms, windows or areas are involved
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
Before you ask for a quote, have a think about:
- A few photos by email, if you can
- How many joints, rooms or windows are involved
- The address or postcode of the job
- Any previous sealing or DIY work
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before any work starts.
Common questions in Hayes
Can you help a landlord with a rental near Hayes & Harlington station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you cover Hayes for sand mastic?
Yes. We work across London and the South East, and Hayes is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
How do I get a quote for sand mastic in Hayes?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or drop us an email and let us know what needs doing and where.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Can I paint the new mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
What guarantee comes with the work?
Our one-year guarantee covers every job.