Greater London · England
Window Mastic in Crooked Billet
Problem with your window and door frames in Crooked Billet? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Sealant in the wrong colour for the frame
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
Window mastic in Crooked Billet, done properly
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that can’t move properly, so deep gaps get backing rod first. The sealant then grips the two sides it should. Typical jobs include water coming in at the bottom corners of a door and draughts coming in around windows and doors, on patio & French doors, composite doors and uPVC windows.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Crooked Billet is something to talk through when you book.
A 12-month guarantee comes as standard.
- Place
- Crooked Billet (SW19, SW20)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Crooked Billet
Jobs vary more than people expect. The main factors:
- The number of rooms or windows
- The old material and how stubborn it is
- Whether the work is at height
- The product the joint needs
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Pictures of the joints, sent by email
- If someone has resealed it before
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
We quote each job on its own. Just phone 0345 464 0079 or send us an email with the details.
What sealant work cannot fix
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
- Misting between the panes of a double-glazed unit (that needs a new unit)
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Aluminium frames
- Patio & French doors
- Composite doors
- Timber windows & doors
- Window sills
- uPVC windows
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What we do, step by step
On the day, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work begins. The work generally takes anything from an hour or two to a full day, depending on how many frames there are. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Crooked Billet. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- 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.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
How to get a quote
If you’re in Crooked Billet and need window mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Read more
Leave it or put it right?
Resealing frames is a short job: it takes anything from an hour or two to a full day, depending on how many frames there are. Leave it until water is coming in and you may need plastering and decorating as well. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why us?
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
- Colour picked to suit the job
- More than 20 years in sealant work
Looking after it afterwards
So the new joints stay in good condition:
- Avoid harsh chemicals near the mastic
- Keep paint off silicone joints
- Ventilate rooms so frames do not stay wet inside
- Keep jet washers away from the mastic
A yearly look round the frames is enough. Small splits are simple to catch before they leak.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
What the job involves on each surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
FAQs for Crooked Billet
Can parking be tricky for a visit in Crooked Billet?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Is Crooked Billet in your area for window mastic?
Yes. We work across London and the South East, and Crooked Billet is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Does the work come with a guarantee?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in.
Will new mastic stop draughts?
In many cases. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
How do I get a quote for window mastic in Crooked Billet?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or email us and tell us what needs doing and where.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
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 call 0345 464 0079 or drop us an email.
Frames and glazing around Crooked Billet
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. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
As a London address, Crooked Billet can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Managing a site like Wimbledon College? Then the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Raynes Park station, renewing tired window mastic between tenants heads off draught and damp complaints.
Crooked Billet is about 1 mile west of Wimbledon, in Greater London. Crooked Billet gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 764 towns and villages across Greater London. Our London page covers work nearby.
Postcode districts we cover here for window mastic: SW19 and SW20. You’ll find streets such as Camp Road, Mckay Road and Pepys Road. We also cover Copse Hill (1 mile south-west), Wimbledon (1 mile east), Bushey Mead (1 mile south), Wimbledon Chase (1 mile south-east) and Kingston Vale (1 mile north-west). We also work in nearby towns such as London (8 miles north-east), City of Westminster (7 miles north-east), Marylebone (8 miles north-east), Kensington (6 miles north), St Pancras (9 miles north-east) and Shoreditch (10 miles north-east).
Local landmarks in Crooked Billet
Around Crooked Billet, our work takes us to homes and buildings near Hollymount School, Cannizaro Park and Ursuline Preparatory School. The nearest railway station is Raynes Park station, roughly 0.9 miles south. Other landmarks nearby include Southside Wandsworth (2.7 miles north-east) and Wimbledon Museum (0.5 miles east). Green spaces nearby include Kew Gardens Lake and Henman Hill.