Greater London · England
Slade Green Sand Mastic
Problem with your window and door surrounds in Slade Green? We cut out the old, prepare the joints and apply the right sealant.
- Patchy fillers round a sash window
- Cracked mastic round a front door frame
- Old sand mastic that has cracked, crumbled or fallen out
Questions from Slade Green
Can parking be tricky for a visit in Slade Green?
Parking in Slade Green, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is Slade Green in your area for sand mastic?
Yes, Slade Green is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Can you replace silicone on a period window with sand mastic?
Yes. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Is the work guaranteed?
All our work has a one-year guarantee, and we are fully insured.
I rent my home. Can I book you?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Are you insured?
Yes. We are fully insured.
How long will you be here?
A typical job takes a few hours for a single window, longer for several. We’ll confirm how long when we quote.
Sand mastic in Slade Green, done properly
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted, so ask us before you decorate. We work on sash and case windows, stone surrounds and brick reveals, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and mastic that needs renewing before redecorating.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Slade Green as anywhere.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Place
- Slade Green (DA8, DA1, DA7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
New mastic over crumbling mastic won’t hold. We remove the loose material first so the new mastic stays put. 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.
Combining jobs into one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why choose Mr Mastic in Slade Green
- One-year guarantee on every job
- ARBOMaster approved applicator
- Over 20 years’ experience
- 4.9 on Google from 180+ five-star reviews
Take a look at what affects the cost and our reviews.
When to call us in Slade Green
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber, and they usually need raking out.
These are the problems we are asked about most:
- Gaps where the frame meets the masonry
- Modern sealant on a period surround
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
Schools such as St. Paul's (Slade Green) Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- Which sealant they’ll use, and why
- What the quote includes, VAT included or not
- The length of the guarantee
- What preparation is included
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sash cords, weights and draught-proofing of the sashes
- Crumbling stone or brickwork round the window
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
Surfaces we seal
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
- Sash and case windows
- Brick reveals
Different surfaces, different methods
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is normally favoured.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Keep sills and gutters clear so water drains away
- Ask the planning authority about consent for listed or conservation-area homes
- Leave the new mastic unpainted
- Look over the window mastic once a year
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Nearby places to Slade Green
Also in Slade Green
How the visit works
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before we start. The work usually takes anything from a few hours to a full day, depending on how many windows. In Slade Green, 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 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.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Read more
Windows and doors in Slade Green
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. 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. 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.
If you live in an older home near St. Augustine's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Slade Green can be tricky for parking: let us know about parking bays, permits or a driveway.
Slade Green is about 1 mile south-east of Erith, in Greater London. From the centre of Slade Green 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 13 miles away.
We cover every part of the DA8, DA1 and DA7 postcode area for sand mastic. Sand mastic is available to properties on Oak Road, Elm Road and Moat Lane. Neighbouring places we cover for sand 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). Further out, we also cover 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).
What’s near Slade Green
In Slade Green, that means homes and buildings near Braeburn Park, Railway Tavern and Haberdashers' Aske's Crayford Academy. There’s a railway station in Slade Green itself: Slade Green station. Nearby you will also find Broadway Shopping Centre (2.3 miles west) and Erith Museum (1.3 miles north-west). Open spaces near Slade Green include Wansunt Pit.