Greater London · England
Crooked Billet External Mastic
Problem with your movement joints in Crooked Billet? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Joints with sealant missing in places
- Failed sealant between panels on a façade
- Sealant that has lost its bond to the brick or render
About our external mastic in Crooked Billet
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. If you’re dealing with damp patches traced to an open external joint and moss and dirt in joints with no sealant left, we can help, on brickwork movement joints, joints between brick and frames and copings & trims alike.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. For a flat in Crooked Billet, check the lease for who looks after the outside.
Our work is backed for twelve months, in Crooked Billet and everywhere else we cover.
- Location
- Crooked Billet (SW19, SW20)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around Crooked Billet, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
How it works
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. In Crooked Billet, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Let us know about parking restrictions
- Clear the area around the work
- Mention if the joints have been sealed before
Ask for a quote
If you are in Crooked Billet and need external mastic, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
Advice
External mastic in Crooked Billet: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
If you live in an older home near Christ Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. For site and facilities teams at buildings such as Wimbledon College, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Crooked Billet is about 1 mile west of Wimbledon, in Greater London. Homes, rented property, offices and hotels in Crooked Billet is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our Greater London coverage runs to 764 places, and Crooked Billet is one of them. London is on our list too, about 8 miles from Crooked Billet.
We work across the SW19 and SW20 postcode area for external mastic and the streets around it. Whether your property is on Camp Road, Mckay Road and Pepys Road or a nearby road, our applicators can take on the job. Nearby, we also carry out external mastic in 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). Within a short drive, we also cover 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).
Near you in Crooked Billet
In Crooked Billet, that means homes and buildings near Hollymount School, Cannizaro Park and Ursuline Preparatory School and the streets around them. The closest station to Crooked Billet 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). For a walk, there’s Kew Gardens Lake and Henman Hill.
FAQs for Crooked Billet
Is parking a problem for a job in Crooked Billet?
Parking in Crooked Billet, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is Crooked Billet in your area for external mastic?
Yes, Crooked Billet is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
What do you need from me for a quote?
A short description and the location, plus photos if you have them. We’ll ask anything else we need to know.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides, primed where needed.
How long does external mastic take?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we will say how long yours will take.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
What happens if it’s left?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Crooked Billet, the repair is bigger than a sealant job.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- 180+ five-star Google reviews
- Experience in homes, commercial sites and hotels
- Full insurance on every job
- A sealant colour to suit the surroundings
Take a look at our cost guide and what customers say.
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
A DIY attempt does not rule out a professional job. We cut it out and start again.
When to call us in Crooked Billet
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
Keep an eye out for these signs:
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
- Plants rooting in failed movement joints
- Weathered mastic that no longer stretches
For landlords with property near Raynes Park station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What preparation is included
- The length of the guarantee
- What product goes in the joint
- Whether they’re fully insured
Places near Crooked Billet
Other services in Crooked Billet
Looking after it afterwards
To keep the joints looking good and working properly:
- Get split or bare joints resealed while the damage is small
- Walk round the building once a year and look at the joints
- Clear growth from the base of walls and joints
- Avoid pressure-washing directly into sealant joints
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
Quotes for external mastic in Crooked Billet
Your quote is based on your job. We look at:
- How many areas need sealing
- Any mould that needs treating
- Working hours on commercial sites
- How much old sealant there is and how hard it is to remove
What it costs depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Helping us quote
Before you ask for a quote, have a think about:
- Where the property is
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.