Greater London · England
Window Mastic in Slade Green
We cover Slade Green for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Water coming in at the bottom corners of a door
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
How we handle window mastic in Slade Green
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the line suits the frame instead of standing out. We’re often asked to deal with cracked sealant at the sill ends and a bead that doesn’t match the frame, on timber windows & doors, window sills and patio & French doors.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
Big or small, you get the same 12-month guarantee.
- Where
- Slade Green (DA8, DA1, DA7)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
So the new joints stay in good condition:
- Air rooms to keep condensation down around windows
- Keep drainage slots and sill grooves clear
- Do not aim a pressure washer at the joints
- Avoid harsh chemicals near the mastic
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Leaks generally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Should I try it myself first?
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.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Different surfaces, different methods
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. If we find rot, we will tell you before going ahead, as a joiner will need to deal with it.
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. Each is cleaned out and resealed.
What window mastic looks like in Slade Green
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. With historic houses such as Hall Place and Gardens (about 2.1 miles south-west) nearby, there’s older building stock in the area around Slade Green as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For site and facilities teams at buildings such as St. Paul's (Slade Green) Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Slade Green station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Slade Green is about 1 mile south-east of Erith, in Greater London. Whether you are in the middle of Slade Green or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Slade Green is one of 764 places in Greater London we cover. You can also see our page for London, roughly 13 miles from Slade Green.
Postcode districts we cover here for window mastic: DA8, DA1 and DA7. If you need window mastic at a property on Oak Road, Elm Road and Moat Lane or a nearby road, we can help. Neighbouring places we cover for window mastic include North End (1 mile west), Barnes Cray (1 mile south), Bexley Riverside (1 mile west), Barnehurst (1 mile west) and Northumberland Heath (1 mile west). Larger places within reach include London (13 miles west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (14 miles west), Shoreditch (12 miles west) and Walthamstow (13 miles north-west).
Around Slade Green
We work in homes and buildings around Braeburn Park, Railway Tavern and Haberdashers' Aske's Crayford Academy. There’s a railway station in Slade Green itself: Slade Green station. Well-known places in the area include Broadway Shopping Centre (2.3 miles west) and Erith Museum (1.3 miles north-west). For a walk, there’s Wansunt Pit.
Quotes for window mastic in Slade Green
The quote reflects the job in front of us. We look at:
- How many rooms, windows or areas are involved
- When we can work, for business premises
- The size of the job
- The type of sealant required
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- If someone has resealed it before
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
Places near Slade Green
What else we do in Slade Green
Why act early in Slade Green
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. Problems with the glass or gaskets are for a window company, and we’ll say so. In a flat in Slade Green, 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.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Why book with us
- Tidy, careful work
- A 12-month guarantee on all work
- 20+ years of sealant experience
- Trusted Arbo and Everbuild sealants
Take a look at our cost guide and what customers say.
Common problems we fix in Slade Green
Sun, frost and rain wear sealant out. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
Most people get in touch when they notice one of these:
- Whistling draughts around closed windows
- Black, perished sealant on frames
- Leaking joints at the ends of sills
- Sealant in the wrong colour for the frame
If you live in an older home near St. Augustine's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- What happens if the job turns out different
- Who turns up on the day
Your questions about window mastic in Slade Green
I let a flat near Slade Green station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can parking be tricky for a visit in Slade Green?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Can I paint over the new sealant?
Most silicone cannot be painted. Let us know beforehand, and we will use a paintable product where it suits.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
Will new mastic stop draughts?
In many cases. Air often gets in between the frame and the wall, and sealing the inside and outside joints closes that path.
What we do, step by step
When we arrive, we start by going over the job with you. We protect the surfaces around the joints before any work starts. Most jobs take most of a day for a typical house, less for a few frames. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Slade Green. It helps if you can point us to a visitor permit or a bay close to the door.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or send us an email.