Greater London · England
Leamouth Window Mastic
Window mastic in Leamouth from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- A bead that does not match the frame
- Water coming in at the bottom corners of a door
- Untidy mastic left by window fitters
Window mastic in Leamouth, done properly
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. We work on aluminium frames, window sills and composite doors, and people most often call us about hard, cracked sealant around windows and cracked sealant at the sill ends.
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 Leamouth is something to talk through when you book.
Your job is guaranteed for a year, as with all our work.
- Location
- Leamouth (E16, E14, SE10)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the quote in Leamouth
We quote each job individually. These are the things that affect it:
- The number of rooms or windows
- Which sealant suits the joint
- Whether the work is at height
- Any mould that needs treating
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
What to tell us for a quote
What to tell us when you ask for a quote:
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- If someone has resealed it before
- The problem you’ve noticed
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
DIY sealant or a professional job?
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.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Window mastic in Leamouth: local notes
Historic houses like Queen's House (about 2.1 miles south) are a reminder that the area around Leamouth 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. 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.
If you let a flat or house near Custom House station, renewing tired window mastic between tenants heads off draught and damp complaints. Schools such as St Luke's Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Leamouth is about 1 mile west of Canning Town, in Greater London. Whether you’re in the middle of Leamouth or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, Leamouth among them.
Jobs for window mastic in E16, E14 and SE10 works the same way as everywhere else we cover. Streets in the area include Ives Road, Nutmeg Lane and Abbott Road, all of which we cover. With the A1262 and A1263 close by, Leamouth is simple for us to get to. We also cover the places around Leamouth: 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). We also work in nearby towns such as 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).
Around Leamouth
Locally, jobs take us to homes and businesses close to Rokeby School, Tower Hamlets College and Bridge House and the streets around them. The nearest railway station is Custom House station, about 0.9 miles east. Nearby you’ll also find Stratford Centre (2.2 miles north) and London Gas Museum (0.9 miles north-west). The countryside around Leamouth includes Lavender Pond and Hollow Pond.
How it works
We keep the work tidy and contained to the joints we’re treating. The job normally takes most of a day for a typical house, less for a few frames. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Let us know about parking restrictions
- Let us know about earlier repairs to the joints
How to get a quote
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.
Advice
Towns and villages near Leamouth
Also in Leamouth
Signs you need window mastic in Leamouth
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Look out for these signs:
- Cracked or shrunken mastic around the frame
- Cold air getting in at the frame edge
- Draughty joints inside around the window
- Rushed sealant from a window installation
In the older streets around Church of St Luke, the joint between an old wall and a newer frame is normally the first place rain gets in.
What your quote should include
- How hidden problems are handled
- Whether they seal over old material or remove it
- What guarantee comes with the work
- What insurance they hold
Common questions in Leamouth
Do you work for landlords with property near Custom House station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Do you cover Leamouth for window mastic?
Yes. We work across London and the South East, and Leamouth is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Is the new sealant paintable?
It depends on the sealant. Some hybrid sealants can be painted; silicone can’t. Tell us if you’re decorating and we’ll choose accordingly.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Leamouth.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Will new mastic stop draughts?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Will there be a smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used before we leave.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.
Surface by surface
Window sills
Masonry sills can have joints where water gets in, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Clean frames with a soft cloth and soapy water
- Wipe condensation off the frames
- Keep paint off silicone joints
- Avoid harsh chemicals near the mastic
Most silicone sealants will not take paint, so mention any painting plans before we start. We can use a paintable sealant where that matters.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.