Greater London · England
Sand Mastic in Forest Gate
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Forest Gate, with a one-year guarantee on every job. Call for a quick quote.
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
- Failed mastic on an exposed elevation
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you are set on DIY, put the effort into 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.
About our sand mastic in Forest Gate
Sand mastic suits most period window surrounds. Newer frames generally get a flexible sealant instead and we’ll explain which is best for yours. If you have draughts and rain around sash boxes and mastic dropping out of the joint, we can help.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Forest Gate is something to talk through when you book.
Every job comes with a one-year guarantee.
- Place
- Forest Gate (E7, E15, E11)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- The size of the job
- Which sealant suits the joint
- When we can work, for business premises
- Any mould that needs treating
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- Any previous sealing or DIY work
- Roughly how big the job is
- Where the property is
- Any access issues, like height or stairs
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Don’t paint over the new mastic
- Avoid heavy scraping on the mastic joint
- Sort the mastic before the decorators arrive
- Get any rot dealt with first
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Also near Forest Gate
What else we do in Forest Gate
Windows and doors in Forest Gate
Historic houses like Valentines Mansion (about 2.2 miles north-east) are a reminder that the area around Forest Gate has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Forest Gate is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you let a flat or house near Wanstead Park station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Forest Gate is about 6 miles north-east of London, in Greater London. If you need sand mastic in Forest Gate, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We are based in Crawley and cover Greater London. 764 places in Greater London are on our list, from the larger towns to small villages. You can also see our page for London, about 6 miles away.
Here we cover the E7, E15 and E11 postcode area for sand mastic. Sand mastic is available to properties on Elm Road, Ash Road and Cary Road and the roads around them. With the A114 and A116 close by, Forest Gate is simple for us to get to. If you’re just outside Forest Gate, we cover Upton (1 mile south), Aldersbrook (1 mile north), Holloway Down (1 mile west), Plashet (1 mile south-east) and Little Ilford (1 mile east). Larger places within reach include London (6 miles south-west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (6 miles west) and Shoreditch (5 miles west).
Near you in Forest Gate
Around Forest Gate, our work takes us to homes and buildings near Tyndale Academy, Forest Gate Community School and The Hudson Bay pub and the streets around them. There’s a railway station in Forest Gate itself: Wanstead Park station. A little further out are Stratford Centre (1.3 miles south-west) and Passmore Edwards Museum (0.9 miles south-west). For a walk, there’s Hollow Pond and Old Ford Island.
Your questions about sand mastic in Forest Gate
Can you do sand mastic in Forest Gate?
Yes. We work across London and the South East, and Forest Gate is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Is parking an issue for sand mastic in Forest Gate?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Are you insured?
Yes, we are fully insured.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
How long does sand mastic take to harden?
A skin forms quite soon, but full hardening takes longer. We will explain what to expect before we leave.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What is sand mastic?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
What does sand mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or email us with a short description of the job.
How the job changes by surface
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
What we’re called out for in Forest Gate
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
These are the problems we are asked about most:
- Tired mastic found when preparing windows for paint
- Mastic dropping out of the joint
- Open joints round the window box
- Wind and rain getting in round a sash window
Homes close to A Radical Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Questions to ask before you book
- Is the old sealant removed completely?
- What preparation is included
- How long to leave it before use
- How hidden problems are handled
Honest limits
Before you book, it’s worth knowing the limits too:
- Decayed frames that need repair
- Masonry that needs repairing
- Decisions on consent for listed homes
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Where we work in Forest Gate
- Stone surrounds
- Timber door frames
- Period & listed homes
- Sash and case windows
- Brick reveals
- Tenement windows
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. For a job in Forest Gate, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
For a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before we start.