Greater London · England
Wanstead Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Wanstead. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Mastic round period door frames that has failed
- Failed mastic on an exposed elevation
- Window mastic to renew ahead of painting
What affects the quote in Wanstead
Jobs vary more than people expect. What affects the quote:
- When we can work, for business premises
- Whether the work is at height
- Mould in or behind the old joints
- The number and length of the joints
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
What we need to know
What to tell us when you ask for a quote:
- Whether it’s a home or a business
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
How we handle sand mastic in Wanstead
Across Wanstead, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand for a neat, traditional finish. If you have draughty sash windows at the surround and gaps between timber frames and stone or brick, we can put it right.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Wanstead is something to talk through when you book.
A 12-month guarantee comes as standard.
- Location
- Wanstead (E11, E18)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured for the work.
Your questions about sand mastic in Wanstead
Is parking an issue for sand mastic in Wanstead?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you do sand mastic in Wanstead?
Yes, Wanstead 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.
Where do you work from?
We are based in Crawley, and we work across South East England, London and Scotland.
Is sand mastic better than silicone for my windows?
That depends on your windows. Period windows in stone or brick usually suit sand mastic, while modern frames normally get a flexible sealant.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours per window, depending on the condition of the joints. We will tell you when we quote.
Can I do it myself?
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 you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Nearby places to Wanstead
What else we do in Wanstead
Common problems we fix in Wanstead
Sand mastic slowly weathers. It hardens, cracks and starts to come away on the stone or timber.
Look out for any of the following:
- Tired mastic found when preparing windows for paint
- Weathered mastic on the most exposed windows
- Draughty sash windows at the surround
- Open joints round the window box
For landlords with property near Leytonstone High Road station, older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- Are they insured?
- Whether all the old sealant comes out first
- How much experience the applicator has
- What product goes in the joint
What we do, step by step
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it generally takes anything from a few hours to a full day, depending on how many windows. In Wanstead, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we are working on
- Tell us if parking is tricky
Getting a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
Advice
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid patching sand mastic with silicone
- Ask a joiner to look at soft timber first
- Take care around the mastic when scraping paint
- Check the mastic when you check the paintwork
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
How the job changes by surface
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
DIY versus a professional finish
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Frames and glazing around Wanstead
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Homes close to Wanstead United Reformed Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in. As a London address, Wanstead can be tricky for parking: let us know about parking bays, permits or a driveway.
Wanstead is about 2 miles south of Woodford, in Greater London. Our applicators cover sand mastic for homes and businesses in Wanstead, as part of our work across Greater London. Our Greater London coverage runs to 764 places, and Wanstead is one of them. For nearby work, see our London page (8 miles or so).
Postcode districts we cover here for sand mastic: E11 and E18. You will find streets such as High Street, Grove Park and The Avenue. You will find Wanstead on the A1008, which makes it straightforward to reach. We also cover the places around Wanstead: Snaresbrook (1 mile north-west), Redbridge (1 mile east), Bushwood Area of Leytonstone (1 mile south-west), Aldersbrook (1 mile south) and South Woodford (1 mile north). Larger places within reach include London (8 miles south-west), City of Westminster (9 miles south-west), Marylebone (9 miles south-west), Kensington (11 miles south-west), St Pancras (7 miles south-west) and Shoreditch (6 miles south-west).
Around Wanstead
We work in homes and buildings around Forest School, The George pub and Valentines Park, among other places. Wanstead’s nearest station is Leytonstone High Road station, roughly 1.4 miles south-west. Other landmarks nearby include 17 & Central (2.3 miles west) and Redbridge Museum (2.4 miles south-east). The countryside around Wanstead includes Hollow Pond and Ainslie Wood.