Greater London · England
Window Mastic in Summerstown
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Summerstown. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- White mastic on grey or black frames
- Cracked internal joints between frame and plaster
- Draughts coming in around windows and doors
Window mastic for homes and businesses in Summerstown
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that can’t move properly, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. Common call-outs are for cracked internal joints between frame and plaster and water coming in at the bottom corners of a door, across timber windows & doors, aluminium frames and uPVC windows.
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.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Where
- Summerstown (SW17, SW18, SW19)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Frames and glazing around Summerstown
Historic houses like Southside House (about 2.4 miles south-west) are a reminder that the area around Summerstown 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near St Mary's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Burntwood School, the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Earlsfield station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Summerstown is about 1 mile north-east of Wimbledon, in Greater London. If you need window mastic in Summerstown, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We are based in Crawley and cover Greater London. Summerstown is one of 764 towns and villages in Greater London where we work for window mastic. We also work in London, around 6 miles away.
Postcode districts we cover here for window mastic: SW17, SW18 and SW19. Whether your property is on Weir Road, Acuba Road and Mount Road or anywhere close by, we can help. Summerstown sits on or near the A218. If you’re 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). Larger places within reach include 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
Around Summerstown, our work takes us to homes and buildings near Hillcroft School, Leather Bottle pub and King George's Park and the streets around them. For rail, the closest station is Earlsfield station, about 0.5 miles north of the centre. A little further out are Southside Wandsworth (1.4 miles north) and St George's Hospital (0.7 miles south-east). Green spaces nearby include Wandle Meadow Nature Park and Battersea Park Lake.
Places near Summerstown
Also in Summerstown
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Condensation trapped between the panes
- A frame that has rotted at the joint
- Worn gaskets, brush seals or a door that has dropped
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- uPVC windows
- Patio & French doors
- Composite doors
- Timber windows & doors
- Window sills
- Aluminium frames
What the job involves on each surface
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. We seal onto sound, dry paintwork or timber.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones are not used, as they can attack some metals. Neutral-cure sealant is the safe choice.
Why act early in Summerstown
A quick bead over the top of old mastic looks like an easy fix, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. In a flat in Summerstown, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why us?
- More than 20 years in sealant work
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
- Sealant colour chosen to suit
Read how sealant jobs are priced and customer reviews.
Summerstown: your questions answered
Can you help a landlord with a rental near Earlsfield station?
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 Summerstown in your area for window mastic?
Yes, Summerstown is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Is the new sealant paintable?
Not generally, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
Landlord and commercial work in Summerstown
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
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.
The process
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from an hour or two to a full day, depending on how many frames there are. In Summerstown, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Tell us if parking is tricky
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Related advice
How we quote for window mastic
We quote each job individually. These are the things that affect it:
- The product the joint needs
- Mould in or behind the old joints
- When we can work, for business premises
- How much there is to do
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Asking for a quote
When you call or email, it’s useful to know:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- The problem you’ve noticed
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Clean frames with a soft cloth and soapy water
- Keep paint and stain on wooden frames in good order
- Don’t use solvent cleaners on the joint
- Keep paint off silicone joints
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.