Greater London · England
Parsons Green Sand Mastic
Sand mastic for Parsons Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps where the frame meets the masonry
- Crumbling sand mastic round a window
- Mastic round period door frames that has failed
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Plan mastic work ahead of painting
- Leave the new mastic unpainted
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
Do not touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
An open joint round the box lets weather through. Left, the gap tends to get bigger.
About our sand mastic in Parsons Green
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. If you have gaps between timber frames and stone or brick and window mastic to renew ahead of painting, we can put it right, on timber door frames, sash and case windows and period & listed homes alike.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
All of our work is guaranteed for twelve months.
- Where
- Parsons Green (SW6, SW10)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
For landlords and businesses
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
Common questions in Parsons Green
Can you help a landlord with a rental near Imperial Wharf station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Do you cover Parsons Green for sand mastic?
Yes. Our work covers London and the South East, and Parsons Green 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 quote.
Is the work guaranteed?
You get our one-year guarantee on every job.
Can you match the sealant colour?
Most of the time, yes. We’ll tell you which colours the right product comes in.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. If you’re redecorating the window, ask us first and we’ll talk you through it.
Do you have insurance?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and shaped to suit the surround.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Places near Parsons Green
What else we do in Parsons Green
How the job changes by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
What happens on the day
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Parsons Green. 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.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Mention if the joints have been sealed before
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
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 add pictures by email if you can.
Related advice
Honest limits
A few problems are outside what sealant work can do:
- Decisions on consent for listed homes
- Putty and glazing repairs
- Sash cords, weights and draught-proofing of the sashes
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Parsons Green
- Sash and case windows
- Brick reveals
- Stone surrounds
- Tenement windows
- Timber door frames
- Period & listed homes
Windows and doors in Parsons Green
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Fulham Palace (about 0.8 miles west) are a reminder that the area around Parsons Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you let a flat or house near Imperial Wharf station, older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as Lady Margaret School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. As a London address, Parsons Green can be tricky for parking: let us know about parking bays, permits or a driveway.
Parsons Green is about 2 miles south of Kensington, in Greater London. For sand mastic in and around Parsons Green, please call 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Greater London. Our Greater London coverage runs to 764 places, and Parsons Green is one of them.
All of SW6 and SW10 is within our area for sand mastic, from the main roads to the quietest streets. Streets in the area include Buer Road, Vera Road and Ewald Road, all of which we cover. Main roads around Parsons Green include the A304, so getting to you is simple. Nearby, we also carry out sand mastic in Hurlingham (1 mile south), Walham Green (1 mile north-east), Chelsea Harbour (1 mile east), Sands End (1 mile east) and West Brompton (1 mile north). Within a short drive, we also cover London (5 miles east), City of Westminster (3 miles north-east), Marylebone (4 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (11 miles north-east).
Near you in Parsons Green
In Parsons Green, that means homes and buildings near Natural History Museum Library and Archives, Parsons Green (park) and The White Horse pub. Other local landmarks include Holy Cross RC School (less than half a mile north) and Queensmill School (under half a mile south-east). Parsons Green’s nearest station is Imperial Wharf station, about 0.7 miles east of the centre. A little further out are Baynard's Castle (5 miles north-east) and Western Hospital (0.8 miles north). Green spaces nearby include WWT London Wetland Centre and Campden Hill.
Leave it or put it right?
If you are redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- Full insurance on every job
- Quality sealants from Arbo and Everbuild
- Any old sealant cut out fully, not covered over
- 12-month guarantee on every job