Greater London · England
Window & door mastic in Upton, Greater London
Mastic around window and door frames, sills and patio doors in Upton, with a 12-month guarantee on every job. Call for a quick quote.
- Leaking joints at the ends of sills
- Hard, cracked sealant around windows
- Cracked internal joints between frame and plaster
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Window mastic in Upton, done properly
Around Upton we seal all kinds of frames: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on uPVC windows, patio & French doors and window sills, and common reasons people get in touch are leaking joints at the ends of sills and old mastic that has gone black or come away.
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, letting in draughts and water.
We stand behind the work with a 12-month guarantee.
- Location
- Upton (E7, E13, E15)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Window mastic in Upton: local notes
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. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
If you let a flat or house near Forest Gate station, renewing tired window mastic between tenants heads off draught and damp complaints. As a London address, Upton can be tricky for parking: let us know about parking bays, permits or a driveway. If you live in an older home near St Peter's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Upton is about 1 mile north of Plaistow, in Greater London. Jobs in Upton get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Upton is one of 764 places in Greater London where we work for window mastic. For nearby work, see our London page.
Jobs for window mastic in E7, E13 and E15 works the same way as everywhere else we cover. That includes homes and businesses on May Road, West Road and Park Road. If you’re just outside Upton, we cover Upton Park (1 mile south-east), Greengate (1 mile south), West Ham (1 mile south-west), Forest Gate (1 mile north) and Plashet (1 mile east). Further out, we also cover 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).
Landmarks near Upton
We work in homes and buildings around St Bonaventure's RC School, West Ham Park and Spotted Dog pub. For rail, the closest station is Forest Gate station, roughly 0.8 miles north of the centre. Nearby you will also find Queen Mary's Hospital for the East End (1 mile west) and Greenwich Castle (4.4 miles south). Not far away are Hollow Pond and Tower Hill.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Rotten timber, which needs a joiner first
- A failed sealed unit that has misted up
- Broken hinges, locks or handles
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Where we work in Upton
- Timber windows & doors
- Composite doors
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
Nearby places to Upton
Other services in Upton
For landlords and businesses
For anyone letting property in or around Upton, several properties can go on one quote. Send us the addresses and the work at each.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Why deal with it now?
The work is quick compared with the damage it prevents: it takes a morning for a couple of windows and a door. Leave it until water is coming in and you may need plastering and decorating as well. In a flat in Upton, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before we start, so you know where you stand.
Why book with us
- Colour picked to suit the job
- 12-month guarantee on every job
- White, clear, grey or coloured to suit, where the product allows
- More than 20 years in sealant work
Read how sealant jobs are priced and our reviews.
How the job changes by surface
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. White is the usual colour, with brown, anthracite grey and black for coloured frames.
What we do, step by step
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the work takes a few hours for a handful of frames, longer for a whole house for a typical job. In Upton, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Clear the area around the work
- Plan for the work area to be out of bounds to pets and children
Get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.
Read more
Upton: your questions answered
Is Upton in your area for window mastic?
Yes, Upton is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Do you work for landlords with property near Forest Gate station?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint.
Do you work on first-floor windows?
Generally, yes. Access is planned before work begins.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. You will know the timing when we quote.
Where is Mr Mastic based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Looking after it afterwards
Looking after new joints is easy:
- Wipe condensation off the frames
- Avoid harsh chemicals near the mastic
- Make sure the drainage slots are not blocked
- Keep timber frames painted
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Leaks generally show up in wet, windy weather, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.