Greater London · England
Soho External Mastic
External mastic across Soho and nearby, with old sealant always removed completely.
- Movement joints filled with mortar instead of sealant
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
What sealant work cannot fix
Before you book, it’s worth knowing the limits too:
- Cracked brickwork or render that needs a builder or plasterer
- Damp that is not coming from the joint
- Movement that is more than a sealant joint can take
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
Where we work in Soho
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Copings & trims
External mastic in Soho
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the line blends in. We work on copings & trims, concrete & block and render & cladding joints, and common reasons people get in touch are failed sealant between panels on a façade and movement joints filled with mortar instead of sealant.
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, and both kinds of building are found across London.
We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.
- Location
- Soho (W1F, W1T, W1D)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we’re called out for in Soho
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Look out for these signs:
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Failed sealant between panels on a façade
- Plants rooting in failed movement joints
Rented homes near Tottenham Court Road station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
What to look for in a quote
- Which colour the sealant will be
- What insurance they hold
- Who does the work, and how experienced they are
- Is VAT in the price?
Leave it or put it right?
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In a flat in Soho, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why Soho customers choose us
- ARBOMaster approved applicator
- A choice of colours where the product allows
- Domestic, commercial and hotel work
- Full insurance on every job
Take a look at what affects the cost or our reviews.
Walls and rooflines in Soho
Historic houses like Benjamin Franklin House (about 0.5 miles south-east) are a reminder that the area around Soho 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.
As a London address, Soho can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you look after a building such as Soho Parish CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Soho is about 1 mile east of City of Westminster, in Greater London. Soho gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Soho is one of 764 places in Greater London where we work for external mastic.
We cover every part of W1F, W1T and W1D for external mastic and the streets around it. If you need external mastic at a property on Duck Lane, Drury Lane and Bridle Lane or a nearby road, our applicators can take on the job. With the A4 and A301 close by, Soho is easy for our applicators to reach. Other places close to Soho include West End (1 mile east), Chinatown (1 mile south), Seven Dials (1 mile east), St Giles (1 mile north-east) and St James's (1 mile south). Larger places within reach include Kensington (3 miles west), Walthamstow (7 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west), Ruislip (13 miles west) and Stockwell (3 miles south).
What’s near Soho
Typical jobs here are in homes near Bar Soho, St Anne's Churchyard and Harris Westminster Sixth Form. Also close by are LITE Regal International School (0.6 miles west) and London Library (0.5 miles south-west). Soho has its own railway station: Tottenham Court Road station. A little further out are Kingly Court (less than half a mile west) and Montfichet's Tower (1.3 miles east). The countryside around Soho includes St. James's Park Lake and Ludgate Hill.
Nearby places to Soho
What else we do in Soho
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Soho. 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.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- Move anything stored near the joints
Ask for a quote
If you’re in Soho and need external mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Advice
How we quote for external mastic
The quote reflects the job in front of us. We take into account:
- When we can work, for business premises
- Which sealant suits the joint
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How we’d reach the joints
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or send us an email.
Common questions in Soho
Can you help a landlord with a rental near Tottenham Court Road station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Is Soho in your area for external mastic?
Yes. We work across London and the South East, and Soho is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Do you work at height?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we will confirm the access.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and helps it last.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.