Greater London · England
Somers Town External Mastic
External mastic across Somers Town and nearby, with old sealant always removed completely and a one-year guarantee.
- Sealant pulling away from one side of the joint
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
External mastic for homes and businesses in Somers Town
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. We work on copings & trims, joints between brick and frames and concrete & block, and the jobs we see most are failed seals between different materials and moss and dirt in joints with no sealant left.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Somers Town, it’s worth checking who is responsible for the outside before booking.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Where
- Somers Town (NW1W, NW1, W1T)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Walls and rooflines in Somers Town
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. 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, Somers Town can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Homes close to St Mary's Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like St Mary and St Pancras Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Somers Town is about 1 mile north-west of St Pancras, in Greater London. For external mastic in and around Somers Town, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We’re based in Crawley and cover Greater London, Somers Town included. Our area takes in 764 places across Greater London, large and small.
We cover every part of the NW1W, NW1 and W1T postcode area for external mastic and the streets around it. Whether your property is on Euston Road, Duke's Road and Phoenix Road or a nearby road, we can help. With the A400 and A501 close by, Somers Town is simple for us to get to. We also cover the places around Somers Town: Euston (1 mile south), Kings Cross (1 mile east), Agar Town (1 mile north), Bloomsbury (1 mile south-east) and Fitzrovia (1 mile south-west). We also work in nearby towns such as London (3 miles south-east), Kensington (4 miles south-west), Walthamstow (6 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west) and Ruislip (12 miles west).
Around Somers Town
Typical jobs here are in homes near Regent High School, Wellcome Collection and Lewis Cubitt Park and the streets around them. Also close by are UCL School of Slavonic and East European Studies (less than half a mile south) and Prince Arthur pub (under half a mile south-west). Somers Town has its own railway station: London Euston station. A little further out are Brunswick Centre (0.6 miles south-east) and Montfichet's Tower (1.8 miles south-east). For a walk, there’s Barnsbury Wood and St. James's Park Lake.
Leave it or put it right?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Somers Town, the repair is bigger than a sealant job.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why us?
- Domestic, commercial and hotel work
- A 12-month guarantee on all work
- Full insurance on every job
- You choose the colour before work begins
See our cost guide and what customers say.
The process
At the end, we look at the finished work together. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on the amount of work. In Somers Town, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We look at every joint and agree a colour to suit the wall.
- 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.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Tell us if parking is tricky
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
How to get a quote
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or drop us an email with the details and send photos if you have them.
Read more
Common questions in Somers Town
Can you help a landlord with a rental near London Euston station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Can you do external mastic in Somers Town?
Yes. Our work covers London and the South East, and Somers Town is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
How often do external joints need resealing?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Nearby places to Somers Town
Also in Somers Town
For landlords and businesses
Landlords and agents in Somers Town can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
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.
When something else is needed
We won’t take on work that won’t last, so these are the limits:
- Walls that need new movement joints cut into them
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Where we work in Somers Town
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Copings & trims
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Ask before painting over external sealant
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
- Get split or bare joints resealed while the damage is small
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
What affects the quote in Somers Town
Every job gets its own quote. These are the things that affect it:
- The size of the job
- Whether the work is at height
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
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:
- Whether it has been sealed before
- Where the job is, and your postcode
- A few photos by email, if you can
- The problem you’ve noticed
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.