Greater London · England
Sand mastic for sash & case windows in Coombe, Greater London
Specialist sand mastic for Coombe: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Patchy fillers round a sash window
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
When it isn’t the sealant
New sealant cannot fix everything, and we’d rather say so up front. It will not solve:
- Decayed frames that need repair
- Sashes that rattle, stick or will not open
- Broken panes
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Brick reveals
- Sash and case windows
- Timber door frames
- Stone surrounds
- Tenement windows
- Period & listed homes
Sand mastic in Coombe, done properly
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. We rake it out and renew it so the surround looks right again. Typical jobs include old cement repairs round a window that have failed and wind and rain getting in round a sash window, across stone surrounds, timber door frames and tenement windows.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Coombe (KT2, KT3, SW20)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Coombe
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams in Coombe and across Greater London. Several sites can go on one quote, and we’re fully insured.
Why deal with it now?
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Coombe, the repair is bigger than a sealant job.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and send you a clear quote before we start.
What you get with us
- More than 20 years in sealant work
- An ARBOMaster approved applicator
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or customer reviews.
Nearby places to Coombe
Also in Coombe
What sand mastic looks like in Coombe
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. 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.
As a London address, Coombe can be tricky for parking: let us know about parking bays, permits or a driveway. Rented homes near Norbiton station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Schools such as Coombe Hill Junior School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Coombe is about 1 mile north of New Malden, in Greater London. Coombe 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 Coombe is one of them. For nearby work, see our London page (9 miles or so).
Jobs for sand mastic in KT2, KT3 and SW20 is quoted and booked the same way as anywhere else. Whether your property is on West Road, Crown Road and Traps Lane or a nearby road, we can help. We also cover the places around Coombe: Motspur Park (1 mile south-east), Coombe Hill (1 mile north), Kingston Vale (1 mile north-east), Norbiton (1 mile south-west) and New Malden (1 mile south). Larger places within reach include London (9 miles north-east), City of Westminster (8 miles north-east), Marylebone (8 miles north-east), Kensington (6 miles north-east), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
What’s near Coombe
In Coombe, that means homes and buildings near Canbury School, Coombe Girls' School and The Royal Oak Public House, among other places. The closest station to Coombe is Norbiton station, about 1 mile south-west. Nearby you’ll also find Bentall Centre (1.8 miles west) and White Lodge Museum (1.8 miles north). The countryside around Coombe includes Kew Gardens Lake and Kingston Hill Road area.
Surface by surface
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Go gently near the mastic when preparing windows
- Ask a joiner to look at soft timber first
- Find out about consent before window work on a listed home
- Inspect the joints round the windows every year or so
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Your questions about sand mastic in Coombe
Do you work for landlords with property near Norbiton station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Is parking a problem for a job in Coombe?
Parking in Coombe, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
How long does sand mastic take to go off?
It takes a while. The skin forms first, and the full set comes later and we will give you an idea for your job.
Should I use sand mastic or silicone?
It depends on the window. Period windows in stone or brick generally suit sand mastic and newer frames generally get a flexible sealant.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
How much does sand mastic cost in Coombe?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or send us an email and tell us what needs doing and where.
How long will you be here?
That depends on how much there is to do, but most jobs take a few hours per window, depending on the condition of the joints. We’ll tell you when we quote.
Are you insured?
Yes. We are fully insured.
What we do, step by step
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, we protect the area and start. It normally takes anything from a few hours to a full day, depending on how many windows. In a London area like Coombe, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- 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.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved and give you a clear price.