Greater London · England
Window & door mastic in Southborough, Greater London
Window and door frames in Southborough need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Mastic that has split away from the wall
- Black, perished sealant on frames
- Whistling draughts around closed windows
Window mastic in Southborough: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. With historic houses such as Bromley Palace (about 1.4 miles north-west) nearby, there’s older building stock in the area around Southborough as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Southborough Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near St Augustine's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Southborough is about 2 miles south-east of Bromley, in Greater London. Jobs in Southborough get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 764 places in Greater London are on our list, large and small. We also work in London, about 10 miles from Southborough.
Work in BR2 and BR1 is quoted and booked the same way as anywhere else. If you need window mastic at a property on Pope Road, Crown Lane and Union Road or a nearby road, we can help. We also cover the places around Southborough: Bromley Common (1 mile south-west), Petts Wood (1 mile east), Locksbottom (2 miles south-east), Shortlands (2 miles west) and Crofton (2 miles south-east). Larger places within reach include London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (13 miles north-west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Around Southborough
Typical jobs here are in homes near Bishop Justus CofE School, Jubilee Country Park and The Chequers Public House and the streets around them. The nearest railway station is Bickley station, about 0.7 miles north. Well-known places in the area include Bethlem Museum of the Mind (0.9 miles south-west) and Bridgeways Day Hospital (less than half a mile south). Open spaces near Southborough include Summer Hill and Downham Woodland Walk.
Window mastic in Southborough, done properly
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through. Where the air is getting in through the window itself, we’ll say so. We’re often asked to deal with whistling draughts around closed windows and mastic that has split away from the wall, across composite doors, window sills and timber windows & doors.
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.
Every job is covered by our 12-month guarantee, wherever you are in Greater London.
- Place
- Southborough (BR2, BR1)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- When we can work, for business premises
- The number of rooms or windows
- The type of sealant required
- Access and height
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
Before you ask for a quote, have a think about:
- Where the property is
- Whether it has been sealed before
- What’s wrong with the joints now
- Pictures of the joints, sent by email
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Different surfaces, different methods
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of 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.
Common problems we fix in Southborough
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Signs it’s time to call us include:
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
- Draughts coming in around windows and doors
- Damp patches on the reveal after heavy rain
Southborough is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Whether VAT is included
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
- How long to leave it before use
Places near Southborough
What else we do in Southborough
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Condensation trapped between the panes
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Window sills
- Patio & French doors
- Timber windows & doors
- uPVC windows
- Aluminium frames
- Composite doors
Aftercare tips
So the new joints stay in good condition:
- Use gentle cleaners on frames and sealant
- Repaint timber before it’s bare
- Paint up to the joint, not over it
- Ventilate rooms so frames do not stay wet inside
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak, and if anything looks wrong, just phone 0345 464 0079 or drop us an email.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
Your questions about window mastic in Southborough
Is Southborough in your area for window mastic?
Yes. Our work covers London and the South East, and Southborough is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear quote.
Is parking an issue for window mastic in Southborough?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Are you insured?
Yes. We are fully insured for domestic and commercial work.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you when we finish.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
How many windows can you do in a day?
The work takes most of a day for a typical house, less for a few frames. Access and the amount of old mastic make the biggest difference.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
How it works
The work is kept neat and contained to the joints we are treating, so you can get on with your day. The job usually takes a few hours for a few frames, or a day or more for a whole house, and we tell you how long to leave it before we go. 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.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
How to prepare
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
Get a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Related advice
Leave it or put it right?
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we will tell you. In a flat in Southborough, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
What you get with us
- A choice of colours where the product allows
- Experience in homes, commercial sites and hotels
- 12-month guarantee on every job
- Old sealant always removed completely