Greater London · England
External & façade joints in Catford, Greater London
Movement joints in Catford need attention? We remove the old material, prepare the joints and seal them properly.
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
- Moss and dirt in joints with no sealant left
External mastic in Catford
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. We work on brickwork movement joints, joints between brick and frames and façade panels, and people most often call us about panel joints letting water in and rain getting behind render or cladding at a joint.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Catford, it’s worth checking who is responsible for the outside before booking.
All of our work is guaranteed for twelve months.
- Place
- Catford (SE6, BR1)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Catford, the repair is bigger than the sealant job would have been.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
Why Catford customers choose us
- 180+ five-star Google reviews
- We leave the area clean and tidy
- A choice of colours where the product allows
- Anti-fungal silicone where joints get wet
Take a look at our cost guide and our reviews.
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. In Catford, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Clear the area around the work
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
Related advice
When it isn’t the sealant
In fairness, some problems need a different trade:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Loose or hollow render, which needs re-rendering
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Façade panels
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
FAQs for Catford
I let a flat near Catford Bridge station. Can you help?
Yes. We work for landlords and agents as well as householders. You can phone 0345 464 0079 or email us with the details for a clear quote.
Can you do external mastic in Catford?
Yes. Our work covers London and the South East, and Catford is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
What do you need from me for a quote?
Let us know what needs doing and where, plus pictures if you have them. We will ask anything else we need to know.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
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.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
When to call us in Catford
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
The most common problems we see are:
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
Schools such as Holy Cross Catholic Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- How hidden problems are handled
- What insurance they hold
- What guarantee comes with the work
- Which colour the sealant will be
Landlord and commercial work in Catford
For anyone letting property in or around Catford, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
What affects the quote in Catford
Your quote is based on your job. We look at:
- Any mould that needs treating
- The size of the job
- The product the joint needs
- The number of rooms or windows
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
What to tell us when you ask for a quote:
- If someone has resealed it before
- Where the job is, and your postcode
- A few pictures by email, if you can
- The rough size of the job
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, call 0345 464 0079 or send us an email.
Nearby places to Catford
What else we do in Catford
Catford buildings and the weather
Historic houses like Eltham Palace (about 2.8 miles east) are a reminder that the area around Catford has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
For an older house near a landmark such as Church of St Laurence and Community Centre, the joints between older walls, newer extensions and the roofline need a sealant that can move. As a London address, Catford can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Catford is about 5 miles east of Streatham, in Greater London. Across the SE6 area, our applicators can take on external mastic. Across Greater London, we cover 764 places, Catford among them.
Every address in SE6 and BR1 is within our area for external mastic. Whether your property is on Bargery Road, Penerley Road and Inchmery Road or anywhere close by, our applicators can take on the job. Neighbouring places we cover for external mastic include Bellingham (1 mile south-west), Southend (1 mile south-west), Ladywell (1 mile north), Hither Green (1 mile north-east) and Bell Green (1 mile south-west). Within a short drive, we also cover London (5 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles north-west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).
Near you in Catford
Typical jobs here are in homes near The London & Rye pub, Trinity Church of England School and Forster Memorial Park and the streets around them. The nearest railway station is Catford Bridge station, roughly 0.5 miles north-west. A little further out are Greenwich Castle (2.6 miles north) and University Hospital Lewisham (0.8 miles north). Open spaces near Catford include Downham Woodland Walk and Knight's Hill.