Greater London · England
Sand Mastic in Merton Abbey
Sand mastic in Merton Abbey from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- Weathered mastic on the most exposed windows
Sand mastic in Merton Abbey
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. If you have draughty sash windows at the surround and patchy fillers round a sash window, we can help, whatever the surface.
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, which is when draughts and damp patches appear in homes in Merton Abbey.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Merton Abbey (SW19, CR4, SW17)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Merton Abbey, the repair is bigger than a sealant job.
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email and we will talk you through it.
Why us?
- Rated 4.9 stars on Google
- Arbo and Everbuild products
- Over 20 years’ experience
- An ARBOMaster approved applicator
Take a look at how sealant jobs are priced and customer reviews.
DIY sealant or a professional job?
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.
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, then guaranteed for a year.
Places near Merton Abbey
Also in Merton Abbey
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured.
Merton Abbey questions
Can you do sand mastic in Merton Abbey?
Yes. Our work covers London and the South East, and Merton Abbey is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is parking a problem for a job in Merton Abbey?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. The weather and joint depth both affect it.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Is it possible to take out silicone and use sand mastic instead?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
Where are you based?
We work from Crawley. We cover Merton Abbey and the rest of Greater London.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
What sealant work can’t fix
It helps to know what we can’t do too:
- Sash cords, weights and draught-proofing of the sashes
- Timber that has rotted
- Broken panes
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Timber door frames
- Tenement windows
- Stone surrounds
- Period & listed homes
- Brick reveals
- Sash and case windows
Windows and doors in Merton Abbey
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Historic houses like Southside House (about 2.2 miles west) are a reminder that the area around Merton Abbey 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 is traditional sand mastic.
As a London address, Merton Abbey can be tricky for parking: let us know about parking bays, permits or a driveway. If you let a flat or house near Haydons Road station, cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Christ Church Colliers Wood include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Merton Abbey is about 2 miles south-east of Wimbledon, in Greater London. From the centre of Merton Abbey to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. 764 places in Greater London are on our list. There’s also a page for London, about 7 miles away.
Here we cover the SW19, CR4 and SW17 postcode area for sand mastic. If you need sand mastic at a property on East Road, Hardy Road and Mount Road or a nearby road, our applicators can take on the job. You’ll find Merton Abbey on the A24, so it’s easy for us to get to. Other places close to Merton Abbey include Merton (1 mile west), Colliers Wood (1 mile north-east), South Wimbledon (1 mile north-west), Eastfields (1 mile east) and Tooting Bec (1 mile north-east). Larger places within reach include London (7 miles north-east), City of Westminster (7 miles north), Marylebone (7 miles north), Kensington (6 miles north), St Pancras (8 miles north) and Shoreditch (9 miles north-east).
Near you in Merton Abbey
Around Merton Abbey, our work takes us to homes and buildings near Wandle Park, Ensham School and Rutlish School. The nearest railway station is Haydons Road station, about 0.9 miles north. Nearby you will also find St George's Hospital (1 mile north) and Wandle Industrial Museum (0.9 miles south-east). Open spaces near Merton Abbey include Henman Hill and Battersea Park Lake.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Do not run silicone over sand mastic
- Go gently near the mastic when preparing windows
- Keep sills and gutters clear so water drains away
- 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.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
What affects the quote in Merton Abbey
Call for a quick quote. What matters most is:
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- Mould in or behind the old joints
- How easy the joints are to reach
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- Roughly how big the job is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
The process
We keep the work tidy and contained to the area we’re working on. Expect the work to take a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. For a job in Merton Abbey, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
Ask for 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 come back to you with a quote.