Greater London · England
Window & door mastic in Kennington, Greater London
Specialist window mastic for Kennington: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Gaps where the sill meets the wall
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a handful of frames, longer for a whole house and we leave things clean and tidy. In a London area like Kennington, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- 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.
Getting ready for the visit
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
- Let us know if you’ve seen damp or leaks
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
Related advice
How we handle window mastic in Kennington
Around Kennington 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 composite doors, uPVC windows and window sills, and people most often call us about white mastic on grey or black frames and cracked or shrunken mastic around the frame.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Kennington (SW8, SW1P, SE11)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Kennington
We do not publish a price list, because no two jobs are the same. The quote depends on:
- Whether the work is at height
- The old material and how stubborn it is
- The number and length of the joints
- Any working-time requirements on site
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Whether it’s a home or a business
- Whether it has been sealed before
- The rough size of the job
- How we’d reach the joints
We quote each job on its own. Simply phone 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
Frames and glazing around Kennington
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Historic houses like Buckingham Palace (about 1.7 miles north-west) are a reminder that the area around Kennington 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.
Managing a site like St Stephen's Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. As a London address, Kennington can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Kennington is about 2 miles south-west of London, in Greater London. If you need window mastic in Kennington, 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, Kennington included. Our area takes in 764 places across Greater London, large and small.
Every address in SW8, SW1P and SE11 is covered for window mastic, from the main roads to the quietest streets. Window mastic is available to properties on Kay Road, Lett Road and Rita Road and the roads around them. Being close to the A203 and A3204, Kennington is easy for our applicators to reach for window mastic. Close by, we work in Oval (1 mile north), South Lambeth (1 mile south-west), Little Portugal (1 mile south), North Brixton (1 mile south-east) and Vauxhall (1 mile north). Larger places within reach include City of Westminster (3 miles north-west), Marylebone (3 miles north-west), Kensington (4 miles west), St Pancras (3 miles north), Shoreditch (4 miles north-east) and Walthamstow (8 miles north-east).
Landmarks near Kennington
Locally, jobs take us to homes and businesses close to St Peter's School, Archbishop Tenison's Church of England School and Lambeth Palace Library. Nearby too are Crown and Thistle pub (less than half a mile south-west) and Vauxhall Park (less than half a mile north-west). Kennington has its own railway station: Vauxhall station. Nearby you’ll also find Baynard's Castle (2.2 miles north) and Type Museum (0.5 miles south). Not far away are Bellenden Road Nature Garden and Ludgate Hill.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Keep paint and stain on wooden frames in good order
- Keep solvents and bleach off the sealant
- Check the mastic once a year
- Make sure the drainage slots are not blocked
Check the drainage slots in the frames aren’t blocked, so rain drains out rather than building up at the sealant.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Towns and villages near Kennington
More services for Kennington
How the job changes by surface
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it.
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. We match the colour to the frame.
Landlord and commercial work in Kennington
If you manage several properties in or around Kennington, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Do you need window mastic in Kennington?
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Keep an eye out for these signs:
- A bead that doesn’t match the frame
- Mastic that is falling out in pieces
- Whistling draughts around closed windows
- Cracked or shrunken mastic around the frame
In the older streets around Calvary Church of God in Christ, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- How long the guarantee is
- Are they insured?
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
Why it’s worth doing now in Kennington
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Kennington, the repair is bigger than a sealant job.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why us?
- White, clear, grey or coloured to suit, where the product allows
- We agree the colour with you first
- Over 20 years’ experience
- We never seal over old sealant
See our cost guide or what customers say.
Kennington questions
Is Kennington in your area for window mastic?
Yes. We work across London and the South East, and Kennington is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Can parking be tricky for a visit in Kennington?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can I add another job to the visit?
Of course. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
Where are you based?
We work from Crawley. We cover Kennington and the rest of Greater London, along with the rest of our area.
Can tenants book the work?
Of course. Check with your landlord; we can send the quote to them too.
Can you seal the gap between the frame and the plaster indoors?
Yes. Inside, the joint between frame and plaster is sealed neatly.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
How much does window mastic cost in Kennington?
Size, access and the old material all affect the cost. Ask us for a quote.