Greater London · England
Sand Mastic in Becontree
We cover Becontree for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Tired mastic found when preparing windows for paint
- A silicone bead on a sash window that spoils the look
- Cracked mastic round a front door frame
What happens if it’s left?
If you’re redecorating, renew the mastic first. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Becontree.
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.
Why choose Mr Mastic in Becontree
- We’re fully insured
- Rated 4.9 stars on Google
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
Take a look at what affects the cost and customer reviews.
About our sand mastic in Becontree
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. Renewing it closes the gap so the surround looks right again. Common call-outs are for window mastic to renew ahead of painting and crumbling sand mastic round a window, on timber door frames, brick reveals and sash and case windows.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Becontree.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Place
- Becontree (RM9, RM10, RM8)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Becontree
Also in Becontree
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too in Becontree and across Greater London. We can quote a run of properties together, and we are fully insured for the work.
Common problems we fix in Becontree
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Most people get in touch when they notice one of these:
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
- Window mastic to renew ahead of painting
- Cracked mastic round a front door frame
Homes close to St George's include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What your quote should include
- How the joint is cleaned and prepared
- How much experience the applicator has
- The length of the guarantee
- How long to leave it before use
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Ask the planning authority about consent for listed or conservation-area homes
- Inspect the joints round the windows every year or so
- Make sure water runs off the sill
- Keep modern sealant off the mastic
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to a full day, depending on how many windows and we leave things clean and tidy. In Becontree, 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.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Related advice
Frames and glazing around Becontree
Historic houses like Eastbury Manor House (about 2.1 miles south-west) are a reminder that the area around Becontree has older buildings as well as new. In older buildings, 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 it’s worth checking before booking.
For landlords with property near Chadwell Heath station, cracked sand mastic around sash windows lets in the draughts tenants complain about. As a London address, Becontree can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Becontree is about 2 miles north-east of Barking, in Greater London. Anywhere in RM9, we can carry out sand mastic at your property. Becontree is one of 764 towns and villages in Greater London we cover. For nearby work, see our London page (11 miles or so).
Jobs for sand mastic in RM9, RM10 and RM8 works the same way as everywhere else we cover. We cover properties on Wood Lane, Eliot Road and Maxey Road and the roads around them. You will find Becontree on the A1240, so it’s easy for us to get to. We also cover Dagenham (1 mile south-east), Becontree Heath (1 mile north), Castle Green (1 mile south-west), Dagenham Green (1 mile south) and Goodmayes (2 miles north-west). Within a short drive, we also cover London (11 miles west), City of Westminster (13 miles west), Marylebone (13 miles west), Kensington (15 miles west), St Pancras (11 miles west) and Shoreditch (10 miles west).
Near you in Becontree
Around Becontree, our work takes us to homes and buildings near Eastbrook pub, Robert Clack School and Parsloes Park, among other places. For rail, the closest station is Chadwell Heath station, about 1.5 miles north-west. A little further out are Redbridge Museum (3 miles west) and The Brewery (2.4 miles north-east). Open spaces near Becontree include Dagenham Village Churchyard.
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- Whether the work is at height
- The type of sealant required
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What we need to know
Photos help, but a description is a good start. Please mention:
- Any access issues, like height or stairs
- If someone has resealed it before
- How many joints, rooms or windows are involved
- Where the property is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Becontree: your questions answered
Is parking an issue for sand mastic in Becontree?
Parking in Becontree, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can you do sand mastic in Becontree?
Yes. Our work covers London and the South East, and Becontree is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Are you fully insured?
Yes. Full insurance covers our work.
Will it make a mess?
No. The area is protected while we work and cleaned up afterwards.
Is the work guaranteed?
Every job comes with our 12-month guarantee, and we are fully insured.
Do you offer different sealant colours?
We will suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
What the job involves on each surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.