Greater London · England
Sand mastic for sash & case windows in Brentford End, Greater London
Problem with your window and door surrounds in Brentford End? We remove the old material, prepare the joints and seal them properly.
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic that needs renewing before redecorating
- Wind and rain getting in round a sash window
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
For anyone letting property in or around Brentford End, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Sand mastic in Brentford End, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. We work on tenement windows, sash and case windows and stone surrounds, and people most often call us about gaps between timber frames and stone or brick and modern sealant on a period surround.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Brentford End as anywhere.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Brentford End (TW8, TW7)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Look over the window mastic once a year
- Have rotten timber repaired before new mastic goes in
- Keep modern sealant off the mastic
- Check with your local planning authority if your home is listed
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at before trying a quick fix.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
Signs you need sand mastic in Brentford End
Rain on the window surround works into any crack and pushes it out. Windows facing the weather tend to go first.
Signs it’s time to call us include:
- Silicone on a period window that looks wrong
- Failed mastic on an exposed elevation
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
Brentford End is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Are they insured?
- Who turns up on the day
- Whether they seal over old material or remove it
- The length of the guarantee
Brentford End homes and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
In the older streets around Church of St Lawrence, the joint between an old wall and a newer frame is usually the first place rain gets in. Schools such as The Green School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Brentford End is about 2 miles north-east of Hounslow, in Greater London. Whether you’re in the middle of Brentford End or further out, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and Brentford End is one of them. You can also see our page for London, about 10 miles away.
Jobs for sand mastic in TW8 and TW7 works the same way as everywhere else we cover. Sand mastic is available to properties on Park Road, Syon Lane and Darcy Road and the roads around them. Being close to the A315, Brentford End is simple for us to get to. Nearby, we also carry out sand mastic in Gillette Corner (1 mile west), Brentford (1 mile north-east), Isleworth (1 mile south-west), Spring Grove (1 mile west) and Northfields (1 mile north). Further out, we also cover London (10 miles east), City of Westminster (7 miles east), Marylebone (8 miles east), Kensington (5 miles east), St Pancras (9 miles east) and Shoreditch (11 miles east).
Local landmarks in Brentford End
We work in homes and buildings around Coach and Horses pub, Kneller Hall Junior School and Boston Manor Park. Brentford End has its own railway station: Syon Lane station. Well-known places in the area include Musical Museum (1.2 miles east) and West Middlesex University Hospital (0.6 miles south-west). The countryside around Brentford End includes Kew Gardens Lake and Richmond Hill.
Towns and villages near Brentford End
Also in Brentford End
What happens on the day
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours per window, depending on the condition of the joints. In Brentford End, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we are working on
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Related advice
What affects the cost of sand mastic
Call for a quick quote. The main things that affect it are:
- The number and length of the joints
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or send us an email and we’ll talk you through it.
Helping us quote
When you contact us, it’s useful to know:
- Where the property is
- Photos by email, if that’s easy
- Whether it has been sealed before
- The problem you’ve noticed
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Brentford End questions
Is parking an issue for sand mastic in Brentford End?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Can you help a landlord with a rental near Syon Lane station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll talk you through it.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme.
Do you guarantee sand mastic work?
Every job comes with our 12-month guarantee, and we’re fully insured.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses, and we’re fully insured.
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How the job changes by surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Timber door frames
Round a period front door, sand mastic gives the right look.