Greater London · England
External & façade joints in Smithfield, Greater London
Problem with your movement joints in Smithfield? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Water getting into walls through failed joints
About our external mastic in Smithfield
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. Common call-outs are for plants rooting in failed movement joints and cracked joints where brick meets render or frames, on joints between brick and frames, façade panels and brickwork movement joints.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall, and both kinds of building are found across London.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Smithfield (EC1V, EC1P, EC1R)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
To keep the joints looking good and working properly:
- Act on the first splits you see
- Keep water from gutters off the wall
- Do not let climbing plants root in the sealant
- Point out the joints to other trades
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Also near Smithfield
Also in Smithfield
Why deal with it now?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Smithfield.
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Why book with us
- Any old sealant cut out fully, not covered over
- One-year guarantee on every job
- Experience in homes, commercial sites and hotels
- Anti-fungal silicone where joints get wet
Landlord and commercial work in Smithfield
Housing providers, facilities teams and property managers book us too in Smithfield and across Greater London. Several sites can be quoted together.
For anyone letting property in or around Smithfield, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- The amount of work
- Whether the work is at height
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or drop us an email.
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours to a few days, depending on the length of joint and the access. In Smithfield, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- 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.
How to prepare
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
Get a quote
Every job is quoted individually. Just call 0345 464 0079 or email us with the details, and photos are welcome.
Related advice
Signs you need external mastic in Smithfield
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
People normally contact us when they notice one of these:
- Sealant that has lost its bond to the brick or render
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
Letting a property close to Farringdon station? Then split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- When the joint can take water or movement
- Whether you can choose the colour
- What insurance they hold
- What the quote includes, VAT included or not
Walls and rooflines in Smithfield
With historic houses such as Dr Johnson's House (about 0.3 miles south-west) nearby, there’s older building stock in the area around Smithfield as well as newer homes. In older buildings, 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 it’s worth agreeing who is responsible before work starts.
Homes close to St Bartholomew-the-Less include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Charterhouse Square School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Smithfield is about 1 mile north of London, in Greater London. If you need external mastic in Smithfield, please ring 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Greater London. Smithfield is one of 764 towns and villages in Greater London we cover for external mastic.
All of EC1V, EC1P and EC1R is within our area for external mastic, from the main roads to the quietest streets. Local streets include Oat Lane, Shoe Lane and Long Lane. Main roads around Smithfield include the A1 and A4. If you’re just outside Smithfield, we cover Farringdon (1 mile north), Blackfriars (1 mile south), Holborn (1 mile west), Temple Bar (1 mile south-west) and Clerkenwell (1 mile north). We also work in nearby towns such as Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south).
Around Smithfield
Around Smithfield, our work takes us to homes and buildings near London Nautical School, Barts Health Archives and St Alban's Church of England Primary School. Also close by are St Mary-at-Hill (1 mile south-east), Oriole pub (less than half a mile south-west) and Postman's Park (within half a mile south-east). Smithfield has its own railway station: Farringdon station. A little further out are Montfichet's Tower (under half a mile south) and Postal Museum (within half a mile south-east). For a walk, there’s Ludgate Hill and St. James's Park Lake.
Common questions in Smithfield
I let a flat near Farringdon station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Is parking an issue for external mastic in Smithfield?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Do you work in Smithfield?
Yes, we do. Smithfield is part of the area we cover, and the service is the same as everywhere else.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Surface by surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Send us any details you have about the façade.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it.