Greater London · England
Sand Mastic in Richmond upon Thames
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Richmond upon Thames. Fully insured, ARBOMaster approved and guaranteed for a year.
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- Mastic dropping out of the joint
Sand mastic for homes and businesses in Richmond upon Thames
Sand mastic doesn’t last for ever and gaps open up round the frame. We rake it out and renew it and tidies the surround. We work on brick reveals, sash and case windows and tenement windows, and common reasons people get in touch are draughty sash windows at the surround and gaps where the frame meets the masonry.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Richmond upon Thames is something to talk through when you book.
There’s a 12-month guarantee on every job, large or small.
- Place
- Richmond upon Thames (TW9, TW10, SW14, TW1)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
A little care helps the new joints last. We recommend:
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
- Look over the window mastic once a year
- Avoid heavy scraping on the mastic joint
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
What the job involves on each surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. On listed buildings, check with your planning authority first.
Also near Richmond upon Thames
Other services in Richmond upon Thames
Sand mastic in Richmond upon Thames: local notes
Historic houses like Pembroke Lodge (about 1.3 miles south) are a reminder that the area around Richmond upon Thames has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Marshgate Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Homes close to Holy Trinity Richmond include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Richmond station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Richmond upon Thames is about 3 miles south of Ealing, in Greater London. Anywhere in TW9, we cover sand mastic for homes and businesses. Richmond upon Thames is one of 764 towns and villages in Greater London we cover. You can also see our page for London, about 9 miles away.
Work in TW9, TW10, SW14 and TW1 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Church Road, King George Square and Topiary Square or anywhere close by, we can help. Being close to the B321 and B322, Richmond upon Thames is simple for us to get to for sand mastic. We also cover North Sheen (1 mile north-east), East Sheen (1 mile east), Mortlake (1 mile east), Kew (2 miles north-east) and Strand-on-the-Green (2 miles north-east). Within a short drive, we also cover London (9 miles east), City of Westminster (7 miles north-east), Marylebone (8 miles north-east), Kensington (5 miles north-east), St Pancras (9 miles north-east) and Shoreditch (10 miles north-east).
Landmarks near Richmond upon Thames
Locally, jobs take us to homes and businesses close to Pesthouse Common, The White Horse Richmond pub and Kneller Hall Junior School and the streets around them. There’s a railway station in Richmond upon Thames itself: Richmond station. A little further out are Eel Pie Island Museum (1.5 miles south-west) and Treaty Centre (3 miles west). Not far away are Duke's Hollow and Richmond Hill.
DIY versus a professional finish
If you do try it yourself, take your time over the 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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Why it’s worth doing now in Richmond upon Thames
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why Richmond upon Thames clients choose us
- Over 20 years’ experience
- Homes, businesses and hotels
- A 12-month guarantee on all work
- An ARBOMaster approved applicator
Take a look at our cost guide or what customers say.
Common questions in Richmond upon Thames
I let a flat near Richmond station. Can you help?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Is parking a problem for a job in Richmond upon Thames?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
How long does the job take?
Most jobs take anything from a few hours to a full day, depending on how many windows. Your quote will say how long we expect yours to take.
Should I use sand mastic or silicone?
We’ll talk it through with you. Sand mastic suits many period homes and newer frames suit modern sealant.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and shaped to suit the surround.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses.
The process
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours per window, depending on the condition of the joints. For a job in Richmond upon Thames, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
Get a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Related advice
For landlords and businesses
We work for landlords and agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
What affects the quote in Richmond upon Thames
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The product the joint needs
- Whether there’s mould to deal with
- Working hours on commercial sites
- The size of the job
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
What to tell us for a quote
To make quoting easier, let us know:
- Photos by email, if that’s easy
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
If you’re in Richmond upon Thames and need sand mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.