Greater London · England
Window Mastic in Walworth
Window and door frames in Walworth need attention? We remove the old material, prepare the joints and seal them properly.
- Black, perished sealant on frames
- Damp patches on the reveal after heavy rain
- Untidy mastic left by window fitters
Window mastic in Walworth
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. Where the air is getting in through the window itself, we will say so. Typical jobs include cracked sealant at the sill ends and draughty joints inside around the window, across aluminium frames, uPVC windows and window sills.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Walworth as anywhere.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Walworth (SE1P, SE17, SE1)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Walworth
I let a flat near Elephant & Castle station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can you do window mastic in Walworth?
Yes. We work across London and the South East, and Walworth is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or send us an email.
Are you insured?
Yes. We’re fully insured for domestic and commercial work.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Is the new sealant paintable?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
What affects the cost of window mastic
Jobs vary more than people expect. The main factors:
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- The number and length of the joints
- How many rooms, windows or areas are involved
Leaving a failed joint generally makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
Helping us quote
When you contact us, it’s useful to know:
- The rough size of the job
- The type of property
- Pictures of the joints, sent by email
- The address or postcode of the job
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or drop us an email and describe the job.
Places near Walworth
What else we do in Walworth
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a morning for a couple of windows and a door, including the tidy-up. In Walworth, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
Get a quote
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Keep paint off silicone joints
- Clean frames with a soft cloth and soapy water
- Ventilate rooms so frames do not stay wet inside
- Avoid harsh chemicals near the mastic
Silicone cannot generally be painted, so if you’re planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Walworth homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to Lady Margaret Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Robert Browning Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Walworth is about 1 mile south of London, in Greater London. From the centre of Walworth to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, and Walworth is one of them.
Jobs for window mastic in SE1P, SE17 and SE1 works the same way as everywhere else we cover. Local streets include Mina Road, Ash Avenue and Angel Lane, and we cover them all. If you are just outside Walworth, we cover London (1 mile north), Bermondsey (1 mile north-east), Camberwell (1 mile south), South Bermondsey (1 mile east) and Denmark Hill (2 miles south). We also work in nearby towns such as City of Westminster (3 miles north-west), Marylebone (3 miles north-west), Kensington (5 miles west), St Pancras (3 miles north-west), Shoreditch (3 miles north) and Walthamstow (7 miles north-east).
Landmarks near Walworth
Locally, jobs take us to homes and businesses close to University Academy of Engineering South Bank, Nursery Row Park and Lord Nelson pub. You’ll also find Lambeth Palace Library (1.3 miles north-west) and St Saviour's and St Olave's Church of England School (within half a mile north). The closest station to Walworth is Elephant & Castle station, roughly 0.5 miles north-west of the centre. Other landmarks nearby include Gabriel's Wharf (1.5 miles north-west) and The Walworth Clinic (less than half a mile west). Not far away are Bellenden Road Nature Garden and St. James's Park Lake.
Surface by surface
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain cannot run into the wall.
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the new bead is laid against the frame and the wall and tooled smooth.
Signs you need window mastic in Walworth
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, while a joint packed solid cannot stretch. That is what backing rod is for.
Most people get in touch when they notice something like this:
- Cold air getting in at the frame edge
- Draughty joints inside around the window
- Gaps where the sill meets the wall
- Rushed sealant from a window installation
If you let a flat or house near Elephant & Castle station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What your quote should include
- What the quote includes, VAT included or not
- What happens if they find a problem under the old sealant
- Are they insured?
- When the joint can take water or movement
When it isn’t the sealant
We won’t take on work that will not last, so these are the limits:
- Broken hinges, locks or handles
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Composite doors
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Window sills
- uPVC windows