Greater London · England
Sand Mastic in Summerstown
Sand mastic across Summerstown and nearby, with old sealant always removed completely.
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
How it works
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. For a job in Summerstown, 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.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
- For business premises, tell us about site rules or sign-in
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Related advice
About our sand mastic in Summerstown
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on tenement windows, period & listed homes and sash and case windows, and common reasons people get in touch are modern sealant on a period surround and cement or filler used on old window joints that has cracked.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Where
- Summerstown (SW17, SW18, SW19)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for sand mastic
Your quote is based on your job. We look at:
- Which sealant suits the joint
- The amount of work
- The number of rooms or windows
- Working hours on commercial sites
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
What to tell us for a quote
When you call or email, these details help:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- Roughly how big the job is
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, call 0345 464 0079 or send us an email.
Do you need sand mastic in Summerstown?
Rain on the window surround works into any crack and loosens it further. Exposed elevations generally fail first.
If you can see any of these, it’s time to have the joints looked at:
- Draughts and rain around sash boxes
- Gaps round a timber door in stone or brick
- Crumbling sand mastic round a window
- Modern sealant on a period surround
Homes close to St Mary's Church include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
Comparing quotes
- How long the guarantee is
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- How the colour is chosen
Nearby places to Summerstown
More services for Summerstown
Common questions in Summerstown
Can you help a landlord with a rental near Earlsfield station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Can parking be tricky for a visit in Summerstown?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Where is Mr Mastic based?
We work from Crawley. We cover Summerstown and the rest of Greater London, along with the rest of our area.
Can I choose the sealant colour?
We help you choose a colour that suits. The choice depends on the product the joint needs.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
How long does sand mastic take?
Typically it takes a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer.
Do you cover Summerstown?
Yes. We cover Summerstown, as part of our work across South East England, London and Scotland. For a quote, call 0345 464 0079 or drop us an email.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Renew mastic before redecorating the windows
- Ask us before painting near the mastic
- Take care around the mastic when scraping paint
- Inspect the joints round the windows every year or so
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
What sand mastic looks like in Summerstown
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. With historic houses such as Southside House (about 2.4 miles south-west) nearby, there’s older building stock in the area around Summerstown as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Rented homes near Earlsfield station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Summerstown is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Summerstown is about 1 mile north-east of Wimbledon, in Greater London. Homes, rented property, offices and hotels in Summerstown can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Summerstown is one of 764 places in Greater London where we work. Our London page covers work nearby, about 6 miles away.
All of SW17, SW18 and SW19 is within our area for sand mastic. If you need sand mastic at a property on Weir Road, Acuba Road and Mount Road or a nearby road, we can help. Main roads around Summerstown include the A218. If you are just outside Summerstown, we cover Earlsfield (1 mile north), Southfields (1 mile north), Tooting Bec (1 mile south-east), Tooting (1 mile south-east) and South Wimbledon (1 mile south-west). Further out, we also cover London (6 miles north-east), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (5 miles north), St Pancras (7 miles north-east) and Shoreditch (8 miles north-east).
What’s near Summerstown
We work in homes and buildings around Hillcroft School, Leather Bottle pub and King George's Park, among other places. For rail, the closest station is Earlsfield station, about 0.5 miles north. Other landmarks nearby include Southside Wandsworth (1.4 miles north) and St George's Hospital (0.7 miles south-east). The countryside around Summerstown includes Wandle Meadow Nature Park and Battersea Park Lake.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
What the job involves on each surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.