South East England and London

External Mastic in Greater London

External mastic in all 764 towns and villages of Greater London, done properly, with a clear quote before we start and a one-year guarantee.

Need external mastic in Greater London?

Call 0345 464 0079

Get a quick quote

Where we work in Greater London

Sealing brickwork movement joints, render, cladding and façade joints. Choose your town from the list to see local details, or get in touch for a quick quote.

Main towns

More services in Greater London

Postcode areas we cover

How external mastic works in Greater London

A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We work on façade panels, render & cladding joints and concrete & block, and the jobs we see most are joints with sealant missing in places and plants rooting in failed movement joints.

A visit follows a simple pattern: we check the joints, 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.

Each joint is checked and the colour of the new sealant agreed.
Failed sealant is removed back to clean, sound faces.
Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
We prime the faces where required.
A low-modulus exterior sealant is gunned in and tooled to a neat finish.

What affects the price in Greater London

Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.

Why book with us

20+ years of sealant experience
We’re fully insured
180+ five-star Google reviews
Any old sealant cut out fully, not covered over

Get a quote

We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details and send photos if you have them.

Near you in London

Around London, our work takes us to homes and buildings near St Mary-at-Hill, St George the Martyr and The BFI Reuben Library and the streets around them. Other local landmarks include Trinity Arms Public House (under half a mile south-east), Ark Globe Academy (within half a mile south), Charles Dickens Primary School (less than half a mile north-west) and Newington Gardens (within half a mile south). There’s a railway station in London itself: Elephant & Castle station. Well-known places in the area include Surrey Dispensary (under half a mile south-east) and Baynard's Castle (0.9 miles north). Open spaces near London include Bellenden Road Nature Garden and St. James's Park Lake.

Nearby schools include London School of Musical Theatre (less than half a mile west)

Outside joints across Greater London

Homes across Greater London range from older brick and stone to modern render and cladding. Where two materials meet is where water usually gets in.

From Victorian terraces to post-war new towns and modern estates, homes across the South East and London cover every era. Each needs the right sealant for its age and materials.

London: Schools such as Charles Dickens Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. In the older streets around St George the Martyr, old and new materials meet at the roofline and walls, which is where sealant earns its keep.

What affects the cost of external mastic

The price is agreed before any work begins. It’s based on:

The size of the job
How much old sealant there is and how hard it is to remove
Access and height
The number of rooms or windows

No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.

What to tell us for a quote

A few details help us give you an accurate quote. When you ask for a quote, tell us:

Whether it’s a home or a business
If someone has resealed it before
How we’d reach the joints
What’s wrong with the joints now

To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.

What happens if it’s left?

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.

Questions to ask before booking

How the surfaces are prepared before sealing
How long to leave it before use
Whether all the old sealant comes out first
Who does the work, and how experienced they are

Landlord and commercial work in Greater London

Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.

We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured.

When it is not the sealant

A few problems are outside what sealant work can do:

Loose or hollow render, which needs re-rendering
Cracked brickwork or render that needs a builder or plasterer
Subsidence or other structural problems

DIY versus a professional finish

If you are 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 fails, we can still redo it.

Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.

Common questions in Greater London

Can you seal joints between render and window frames?

Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.

Can you quote for more than one area?

Yes. Just list everything you need.

What do you put in the joint?

Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.

Can you work on commercial sites?

Yes. Hotels, offices and other businesses use us.

Is there any odour?

Sometimes, a little. It fades as the sealant cures.

Are you ARBOMaster approved?

Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.

What colours does the sealant come in?

Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so it doesn’t stand out.