Greater London · England
Sand Mastic in Barnes
Problem with your window and door surrounds in Barnes? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Open joints round the window box
- Mastic dropping out of the joint
- Draughty sash windows at the surround
Sand mastic in Barnes, done properly
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we’ll advise if you’re redecorating. We work on timber door frames, brick reveals and sash and case windows, and common reasons people get in touch are draughts and rain around sash boxes and open joints round the window box.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Barnes.
A 12-month guarantee comes as standard, so you’re covered after we have gone.
- Where
- Barnes (SW13, SW15, SW14)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work can’t fix
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Sashes that need overhauling
- Whether work needs listed building consent
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Tenement windows
- Sash and case windows
- Period & listed homes
- Brick reveals
- Stone surrounds
- Timber door frames
Nearby places to Barnes
Also in Barnes
Quotes for sand mastic in Barnes
We quote each job individually. These are the things that affect it:
- How many rooms, windows or areas are involved
- The type of sealant required
- Whether the work is at height
- The number and length of the joints
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Asking for a quote
To help us quote quickly, let us know:
- Whether it has been sealed before
- Roughly how big the job is
- What’s wrong with the joints now
- Photos by email, if that is easy
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.
Surface by surface
Timber door frames
A neat sand mastic joint round a front door suits a period home.
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.
How the visit works
On the day, we look over the joints with you first. Surfaces next to the work are protected before we start. The work normally takes a few hours per window, depending on the condition of the joints. In Barnes, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- 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.
How to prepare
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and give you a clear price before we start.
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Sand mastic in Barnes: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. With historic houses such as Chiswick House (about 0.9 miles north-west) nearby, there’s older building stock in the area around Barnes as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Letting a property close to Barnes Bridge station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. Barnes is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Barnes is about 2 miles west of Fulham, in Greater London. Jobs in Barnes get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Greater London, we cover 764 places, and Barnes is one of them. For nearby work, see our London page.
Our applicators cover all of SW13, SW15 and SW14 for sand mastic and the streets around it. Streets in the area include Church Road, Station Road and Barnes High Street, all of which we cover. Being close to the A306 and B349, Barnes is easy for our applicators to reach. Neighbouring places we cover for sand mastic include Old Chiswick (1 mile north), Turnham Green (1 mile north-west), Mortlake (1 mile south-west), East Sheen (1 mile south-west) and Putney (1 mile south-east). Larger places within reach include London (7 miles east), City of Westminster (5 miles north-east), Marylebone (5 miles north-east), Kensington (3 miles north-east), St Pancras (7 miles north-east) and Shoreditch (8 miles north-east).
Local landmarks in Barnes
Around Barnes, our work takes us to homes and buildings near Chiswick School, Sun Inn and Barn Elms and the streets around them. Also close by are Polish Library POSK in London (1.4 miles north) and The Harrodian School (0.6 miles north). There’s a railway station in Barnes itself: Barnes Bridge station. A little further out are Barnes Hospital (0.7 miles south-west) and Putney Exchange (1.4 miles south-east). For a walk, there’s Richmond Hill and Kew Gardens Lake.
FAQs for Barnes
Can you do sand mastic in Barnes?
Yes. Our work covers London and the South East, and Barnes is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Is parking a problem for a job in Barnes?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic beds in well.
How long does sand mastic take?
Typically it takes a few hours for a single window, longer for several. Larger jobs naturally take longer, and we will say how long yours will take.
Are you insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
What we’re called out for in Barnes
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
People generally contact us when they notice one of these:
- Mastic that needs renewing before redecorating
- Failed mastic on an exposed elevation
- Modern sealant on a period surround
- Old sand mastic that has cracked, crumbled or fallen out
If you live in an older home near Barnes Methodist Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before booking
- Who turns up on the day
- What product goes in the joint
- Are they insured?
- How hidden problems are handled
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Ask the planning authority about consent for listed or conservation-area homes
- Don’t paint over the new mastic
- Make sure water runs off the sill
- Don’t run silicone over sand mastic
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.