Greater London · England
Window Mastic in South Bermondsey
Window mastic for South Bermondsey, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rain getting in at the frame or under the sill
- Gaps between the frame and the inside reveal
- Cracked sealant at the sill ends
About our window mastic in South Bermondsey
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. Typical jobs include cracked internal joints between frame and plaster and damp patches on the reveal after heavy rain, across patio & French doors, aluminium frames and window sills.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in South Bermondsey as anywhere.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Where
- South Bermondsey (SE16, SE15, SE1)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in South Bermondsey
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
Landlords and agents in South Bermondsey can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Signs you need window mastic in South Bermondsey
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
It’s worth asking for a quote if you see:
- Draughty joints inside around the window
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
- Gaps where the sill meets the wall
Schools such as Ilderton Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Before booking anyone
- Whether VAT is included
- Are they insured?
- What happens if the job turns out different
- Who does the work, and how experienced they are
Honest limits
Before booking, it’s worth knowing the limits too:
- Worn gaskets, brush seals or a door that has dropped
- Condensation trapped between the panes
- Soft or decayed wood in the frame
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Aluminium frames
- Timber windows & doors
- Composite doors
- Patio & French doors
- Window sills
- uPVC windows
Frames and glazing around South Bermondsey
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Mansion House (about 2.3 miles north-west) are a reminder that the area around South Bermondsey has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as Church of St Augustine, the joint between an old wall and a newer frame is generally the first place rain gets in. Letting a property close to South Bermondsey station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
South Bermondsey is about 2 miles north-west of New Cross, in Greater London. If you need window mastic in South Bermondsey, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. Our Greater London coverage runs to 764 places, and South Bermondsey is one of them.
Jobs for window mastic in SE16, SE15 and SE1 is quoted and booked the same way as anywhere else. That includes homes and businesses on Tenda Road, Rolls Road and Simms Road and the roads around them. South Bermondsey is on the A2208, which makes it straightforward to reach with everything needed for window mastic. Other places close to South Bermondsey include Surrey Canal (1 mile east), Surrey Quays (1 mile north-east), Bermondsey (1 mile north-west), Peckham (1 mile south) and Rotherhithe (1 mile north-east). Further out, we also cover City of Westminster (4 miles north-west), Marylebone (4 miles north-west), Kensington (6 miles west), St Pancras (4 miles north-west), Shoreditch (3 miles north) and Walthamstow (7 miles north).
Landmarks near South Bermondsey
We work in homes and buildings around The Kentish Drovers Public House, Paterson Park and City of London Academy, among other places. There’s a railway station in South Bermondsey itself: South Bermondsey station. Other landmarks nearby include New Cross Hospital (0.6 miles south-east) and Surrey Quays Shopping Centre (0.8 miles north-east). Green spaces nearby include St. James's Park Lake and Tower Hill.
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a morning for a couple of windows and a door and we leave things clean and tidy. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in South Bermondsey. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
How the job changes by surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
How we quote for window mastic
Jobs vary more than people expect. What affects the quote:
- The size of the job
- Working hours on commercial sites
- How easy the joints are to reach
- The number of rooms or windows
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
What to tell us for a quote
When you call or email, these details help:
- What’s wrong with the joints now
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you are ready, ring 0345 464 0079 or drop us an email.
Also near South Bermondsey
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Why deal with it now?
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. In a flat in South Bermondsey, 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 hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- Full insurance on every job
- Sanitary silicone with an anti-fungal additive in wet areas
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
See what affects the cost and our reviews.
FAQs for South Bermondsey
Do you cover South Bermondsey for window mastic?
Yes. Our work covers London and the South East, and South Bermondsey is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Can parking be tricky for a visit in South Bermondsey?
Parking in South Bermondsey, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
What does window mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
Do you have sealant for grey or black windows?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.