Greater London · England
Sand mastic for sash & case windows in Woolwich, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Woolwich. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Old cement repairs round a window that have failed
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Inspect the joints round the windows every year or so
- Keep modern sealant off the mastic
- Sort the mastic before the decorators arrive
- Don’t paint over the new mastic
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
About our sand mastic in Woolwich
Sand mastic skins over fairly quickly but full hardening takes longer. Traditional guidance is not to paint over it and we’ll advise if you are redecorating. If you have open joints round the window box and silicone on a period window that looks wrong, we can put it right.
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, and access in Woolwich is something to talk through when you book.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Location
- Woolwich (SE18, E16, SE7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to Woolwich
More services for Woolwich
Leave it or put it right?
Not every filler suits an old window surround. Sand mastic is the like-for-like choice and that can be important for listed homes. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why book with us
- Quality sealants from Arbo and Everbuild
- Tidy, careful work
- ARBOMaster approved applicator
- Rated 4.9 stars on Google
Read what affects the cost and what customers say.
Sand mastic in Woolwich: local notes
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Historic houses such as Queen's House, about 2.9 miles west, show how far back building around Woolwich goes, and older homes nearby need a sealant that suits their walls. Schools such as Mulgrave Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Woolwich is about 6 miles south-east of Leyton, in Greater London. Homes, rented property, offices and hotels in Woolwich can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 764 places across Greater London, large and small. There’s also a page for London, roughly 7 miles from Woolwich.
Every address in SE18, E16 and SE7 is covered for sand mastic, from the main roads to the quietest streets. We cover properties on Market Street, Woolwich High Street and Beresford Square Market Place. If you are just outside Woolwich, we cover Plumstead (1 mile east), Charlton (1 mile west), New Charlton (1 mile west), Shooter's Hill (1 mile south) and Kidbrooke (2 miles south-west). Further out, we also cover London (7 miles west), City of Westminster (9 miles west), Marylebone (9 miles west), Kensington (11 miles west), St Pancras (8 miles west) and Shoreditch (7 miles north-west).
Landmarks near Woolwich
In Woolwich, that means homes and buildings near Woolwich Common, Oasis Academy Silvertown and Oasis Academy Silvertown. Woolwich has its own railway station: Woolwich Dockyard station. A little further out are Royal Artillery Museum (0.5 miles north-east) and British Hospital for Mothers and Babies (0.5 miles west). For a walk, there’s Gilbert's Pit.
The process
When we get to you, 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 a few hours per window, depending on the condition of the joints. In Woolwich, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Clear items away from the joints we’re working on
- Mention any parking rules near the property
- Tell us about any water getting in
How to get a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
Woolwich: your questions answered
Is Woolwich in your area for sand mastic?
Yes. Our work covers London and the South East, and Woolwich is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Can you help a landlord with a rental near Woolwich Dockyard station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Are you fully insured?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can I paint the new mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Common problems we fix in Woolwich
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
Keep an eye out for any of the following:
- Crumbling sand mastic round a window
- Gaps where the frame meets the masonry
- Gaps round a timber door in stone or brick
- Weathered mastic on the most exposed windows
For landlords with property near Woolwich Dockyard station, any sash windows need sound mastic to keep draughts and rain out.
What to look for in a quote
- Whether they’re fully insured
- How long to leave it before use
- How long the guarantee is
- How the colour is chosen
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
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 does not work out, we can still put it right.
Different surfaces, different methods
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
What sealant work cannot fix
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Sashes that need overhauling
- Decayed frames that need repair
- Masonry that needs repairing
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Sash and case windows
- Tenement windows
- Stone surrounds
- Timber door frames
- Brick reveals
- Period & listed homes