Greater London · England
External & façade joints in Streatham Hill, Greater London
Professional external mastic in and around Streatham Hill, with every bit of old sealant taken out first and a 12-month guarantee.
- Plants rooting in failed movement joints
- Failed seals between different materials
- Rigid filler in a joint that should flex
What the job involves on each surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
External mastic for homes and businesses in Streatham Hill
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we do not skip that step. Typical jobs include sealant that has lost its bond to the brick or render and leaking joints around cladding and façade panels, across joints between brick and frames, façade panels and concrete & block.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Streatham Hill, tell us how high the joints are and how to reach the back of the building.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Place
- Streatham Hill (SW2, SW16, SW12)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Streatham Hill
Also in Streatham Hill
What affects the quote in Streatham Hill
Jobs vary more than people expect. What affects the quote:
- The type of sealant required
- Whether there’s mould to deal with
- How easy the joints are to reach
- How many areas need sealing
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
When you contact us, these details help:
- If someone has resealed it before
- What’s wrong with the joints now
- Where the property is
- Photos by email, if that is easy
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we’ll take it from there.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Outside joints around Streatham Hill
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. Historic houses like Kingswood House (about 1.9 miles east) are a reminder that the area around Streatham Hill 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.
Streatham Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you live in an older home near Church of St Margaret, older walls, gutters and the joints where extensions meet them need a flexible sealant. Letting a property close to Streatham Hill station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Streatham Hill is about 2 miles south of Stockwell, in Greater London. If you need external mastic in Streatham Hill, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London. Streatham Hill is one of 764 places in Greater London where we work.
Here we cover the SW2, SW16 and SW12 postcode area for external mastic. Whether your property is on Keymer Road, Romeyn Road and Palace Road or anywhere close by, our applicators can take on the job. Being close to the A205, Streatham Hill is simple for us to get to. Other places close to Streatham Hill include Tulse Hill (1 mile north-east), Hyde farm estate (1 mile west), Streatham (1 mile south), Grange Mills (1 mile west) and Clapham Park (1 mile north-west). We also work in nearby towns such as London (4 miles north), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (5 miles north-west), St Pancras (6 miles north) and Shoreditch (6 miles north).
Near you in Streatham Hill
Locally, jobs take us to homes and businesses close to City Heights E-ACT Academy, Streatham Common and The Holland Tringham pub, among other places. Streatham Hill has its own railway station: Streatham Hill station. A little further out are Tooting Bec Hospital (1.4 miles south-west) and Southside Wandsworth (3.2 miles west). Not far away are Battersea Park Lake and Knight's Hill.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid pressure-washing directly into sealant joints
- Keep movement joints as flexible joints, not mortar
- Look over the joints every year, ideally after winter
- Clear growth from the base of walls and joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
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.
Landlord and commercial work in Streatham Hill
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Common questions in Streatham Hill
Is parking an issue for external mastic in Streatham Hill?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Is Streatham Hill in your area for external mastic?
Yes, Streatham Hill is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
How long before the joint can be used?
It depends on the product. Before we leave, we will tell you the cure time.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so the joint doesn’t draw the eye.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Why act early in Streatham Hill
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Streatham Hill, the repair is bigger than a sealant job.
Combining jobs into one visit is normally more efficient than separate visits. We’ll give you a clear price for the lot.
What you get with us
- Sealant colour chosen to suit
- Rated 4.9 stars on Google
- Colour agreed with you before we start
- We are fully insured
Read what affects the cost and what customers say.
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of joints, longer for a whole elevation. In Streatham Hill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
- Mention any sign-in or site rules at work premises
How to get a quote
We don’t publish a price list. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or send us an email.