Greater London · England
Leamouth Sand Mastic
Sand mastic across Leamouth and nearby, with old sealant always removed completely and a one-year guarantee.
- Mastic round period door frames that has failed
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
Aftercare tips
Good habits help new joints last longer. A few tips:
- Make sure water runs off the sill
- Don’t paint over the new mastic
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
Do not touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Sand mastic in Leamouth
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 brick reveals, sash and case windows and period & listed homes, and common reasons people get in touch are crumbling sand mastic round a window and patchy fillers round a sash window.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Leamouth (E16, E14, SE10)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Leamouth
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
The most common problems we see are:
- Failed mastic on an exposed elevation
- Gaps where the frame meets the masonry
- Mastic that needs renewing before redecorating
- Wind and rain getting in round a sash window
For an older house near a landmark such as Church of St Luke, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- How the surfaces are prepared before sealing
- Are they insured?
- Which sealant they’ll use, and why
- What happens if the job turns out different
Leamouth questions
Is parking an issue for sand mastic in Leamouth?
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 help a landlord with a rental near Custom House station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
How long will you be here?
Typically it takes a few hours per window, depending on the condition of the joints. Bigger jobs take longer.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
Can you quote for more than one area?
Yes. Just list everything you need and we’ll quote it together.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.
What we can’t put right
We’d rather tell you now than do work that won’t last, so these are the limits:
- Putty and glazing repairs
- Sashes that need overhauling
- Whether work needs listed building consent
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
Where we work in Leamouth
- Period & listed homes
- Sash and case windows
- Timber door frames
- Stone surrounds
- Tenement windows
- Brick reveals
Places near Leamouth
More services for Leamouth
Why deal with it now?
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Converted houses in London often have a bathroom above someone else’s living room, 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.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Leamouth
- Fully insured
- One-year guarantee on every job
- Old sealant always removed completely
- We leave the area clean and tidy
See our cost guide and what customers say.
The process
There is not much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several. In Leamouth, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we’re working on
- Plan for the work area to be out of bounds to pets and children
Getting a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or email us.
Advice
What sand mastic looks like in Leamouth
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
Letting a property close to Custom House station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. For site and facilities teams at buildings such as St Luke's Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Leamouth is about 1 mile west of Canning Town, in Greater London. From the centre of Leamouth to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, and Leamouth is one of them.
Jobs for sand mastic in E16, E14 and SE10 works the same way as everywhere else we cover. You’ll find streets such as Ives Road, Nutmeg Lane and Abbott Road. Leamouth sits on or near the A1262 and A1263, so getting to you is simple. Close by, we work in Limmo Peninsula (1 mile east), Blackwall (1 mile south-west), Coldharbour (1 mile south-west), Canning Town (1 mile east) and West Silvertown (1 mile south-east). Larger places within reach include London (4 miles west), City of Westminster (7 miles west), Marylebone (7 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (4 miles west).
Landmarks near Leamouth
In Leamouth, that means homes and buildings near Rokeby School, Tower Hamlets College and Bridge House and the streets around them. Leamouth’s nearest station is Custom House station, about 0.9 miles east. Other landmarks nearby include Stratford Centre (2.2 miles north) and London Gas Museum (0.9 miles north-west). Open spaces near Leamouth include Lavender Pond and Hollow Pond.
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What affects the quote in Leamouth
Every job gets its own quote. These are the things that affect it:
- How much there is to do
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- The product the joint needs
What it costs depends on how much there is to do, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
Helping us quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- The problem you’ve noticed
- Pictures of the joints, sent by email
- Roughly how big the job is
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before we start.