Greater London · England
Window & door mastic in Walham Green, Greater London
Window mastic for Walham Green and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Mastic that is falling out in pieces
- Gaps where the sill meets the wall
- Rushed sealant from a window installation
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Damp coming through the wall itself rather than the frame joint
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- uPVC windows
- Timber windows & doors
About our window mastic in Walham Green
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on timber windows & doors, aluminium frames and composite doors, and common reasons people get in touch are rushed sealant from a window installation and cracked internal joints between frame and plaster.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Walham Green.
Your job is guaranteed for a year, as with all our work.
- Place
- Walham Green (SW6, SW10, SW11)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Walham Green
Also in Walham Green
How we quote for window mastic
We don’t publish a price list. What we look at:
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
- How much there is to do
- Mould in or behind the old joints
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 we need extra access for height. Your quote takes all of that into account.
What we need to know
To help us quote quickly, let us know:
- Access, such as stairs, a lift or height
- Photos by email, if that is easy
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
Want a quote for window mastic? Please phone 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Windows and doors in Walham Green
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. With historic houses such as Carlyle's House (about 1 mile north-east) nearby, there’s older building stock in the area around Walham Green as well as newer homes. 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.
Managing a site like Chelsea Independent College? Then its window and door frames need their mastic kept sound, just like a home’s. Walham Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For an older house near a landmark such as Church of St John, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Walham Green is about 2 miles south of Kensington, in Greater London. Anywhere in SW6, we cover window mastic for homes and businesses. Walham Green is one of 764 places in Greater London we cover.
Work in SW6, SW10 and SW11 works the same way as everywhere else we cover. We cover properties on Farm Lane, Lots Road and Epple Road. You will find Walham Green on the A304, so it’s easy for us to get to with everything needed for window mastic. Other places close to Walham Green include Chelsea Harbour (1 mile south-east), Parsons Green (1 mile south-west), World's End (1 mile north-east), Sands End (1 mile south-east) and West Brompton (1 mile north). Larger places within reach include London (4 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
Around Walham Green
Typical jobs here are in homes near Natural History Museum Library and Archives, Heatherley School of Fine Art and Langford Primary School. Also close by are William Parnell Park (under half a mile south) and The Rose pub (less than half a mile south-east). Walham Green has its own railway station: Imperial Wharf station. Other landmarks nearby include Chelsea Stadium Tour And Museum (within half a mile north) and Chelsea and Westminster Hospital (0.5 miles north-east). The countryside around Walham Green includes Battersea Park Lake and WWT London Wetland Centre.
What happens on the day
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours for a few frames, or a day or more for a whole house in most cases. In Walham Green, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
How to get 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.
Read more
What the job involves on each surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal and we avoid acetoxy silicones, which can react with some metals. We use a neutral-cure product.
Aftercare tips
After the cure time, these simple habits help:
- Keep paint off silicone joints
- Keep paint and stain on wooden frames in good order
- Look round the frames every year or so
- Wash the frames with mild soapy water
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just ring 0345 464 0079 or send us an email.
Leaks normally show up in wet, windy weather, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
Common questions in Walham Green
Can you do window mastic in Walham Green?
Yes. Our work covers London and the South East, and Walham Green is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Can you help a landlord with a rental near Imperial Wharf station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Do you have sealant for grey or black windows?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
How long before the joint can be used?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Can resealing stop a draught around my window?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. 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.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why Walham Green clients choose us
- You choose the colour before work begins
- An ARBOMaster approved applicator
- 180+ five-star Google reviews
- One-year guarantee on every job
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.