Greater London · England
External & façade joints in Streatham, Greater London
Our applicators work in Streatham on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Rigid filler in a joint that should flex
- Panel joints letting water in
- Sealant pulling away from one side of the joint
About our external mastic in Streatham
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. We work on façade panels, brickwork movement joints and copings & trims, and common reasons people get in touch are rigid filler in a joint that should flex and gaps where render, brick and frames meet.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Streatham (SW16, SW2, CR4, SW12)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Streatham
Is parking a problem for a job in Streatham?
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.
I let a flat near Streatham station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
How do you reach high-level joints?
It depends on the building. Tell us the height, the number of joints and what’s below them and we will confirm how they can be reached safely.
How long does the job take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation. We will confirm how long when we quote.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Streatham, the repair is bigger than a sealant job.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
Take a look at how sealant jobs are priced or our reviews.
Aftercare tips
After the cure time, these simple habits help:
- Show decorators and builders where the movement joints are
- Do not let climbing plants root in the sealant
- Act on the first splits you see
- Make sure movement joints are not pointed over
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Walls and rooflines in Streatham
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like St Andrew's Catholic Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. If you let a flat or house near Streatham station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Streatham is about 5 miles south of London, in Greater London. For external mastic in and around Streatham, please call 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover Greater London, Streatham included. Streatham is one of 764 towns and villages in Greater London we cover.
All of SW16, SW2, CR4 and SW12 is covered for external mastic. We cover properties on Stanthorpe Road, Gleneagle Mews and Madeira Road. Streatham sits on or near the A205 and A216. We also cover the places around Streatham: Streatham Park (1 mile west), Furzedown (1 mile west), Streatham Hill (1 mile north), Hyde farm estate (1 mile north) and Grange Mills (1 mile north-west). We also work in nearby towns such as London (5 miles north), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (6 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Around Streatham
We work in homes and buildings around Bishop Thomas Grant Catholic Secondary School, Streatham Common and Waldorf School of South West London. Streatham has its own railway station: Streatham station. Well-known places in the area include Clockworks Museum (1.1 miles east) and Southside Wandsworth (3.3 miles north-west). For a walk, there’s Knight's Hill and Battersea Park Lake.
How the job changes by surface
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Cladding and façade panels
If the façade has a specified sealant, that’s what we use. Send us any details you have about the façade.
When something else is needed
To be straight with you, some problems need a different trade:
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
- Failed render or damaged cladding panels
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
Do you need external mastic in Streatham?
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
These are the problems we are asked about most:
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
Streatham is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- What insurance they hold
- Which sealant they’ll use, and why
- What happens if the job turns out different
- Whether you can choose the colour
How the visit works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. In a London area like Streatham, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Mention any tricky access
- Move anything stored near the joints
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear quote.
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What affects the quote in Streatham
Call for a quick quote. The main things that affect it are:
- The product the joint needs
- How many rooms, windows or areas are involved
- The number and length of the joints
- When we can work, for business premises
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
What we need to know
What to tell us when you ask for a quote:
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- Roughly how big the job is
If you are in Streatham and need external mastic, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.