Greater London · England
External Mastic in Kentish Town
Specialist external mastic for Kentish Town: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Hard, crazed mastic that has stopped moving
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
The process
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a handful of joints, longer for a whole elevation. In Kentish Town, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Clear the area around the work
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear quote before any work starts.
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External mastic in Kentish Town
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. Common call-outs are for weathered mastic that no longer stretches and movement joints with cracked, split or missing sealant, on joints between brick and frames, façade panels and brickwork movement joints.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Kentish Town, joints up high may need ladders or other access, which is worth talking through when you book.
All of our work is guaranteed for twelve months, in Kentish Town and everywhere else we cover.
- Location
- Kentish Town (NW5, NW1, NW3)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Kentish Town: your questions answered
Do you work for landlords with property near Kentish Town West station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Do you cover Kentish Town for external mastic?
Yes. We work across London and the South East, and Kentish Town is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Kentish Town.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Leave it or put it right?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Kentish Town, the repair is bigger than the sealant job would have been.
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why book with us
- Anti-fungal silicone where joints get wet
- Any old sealant cut out fully, not covered over
- A choice of colours where the product allows
- 4.9 on Google from 180+ five-star reviews
Read what affects the cost and customer reviews.
What the job involves on each surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap so the sealant is not too deep.
Also near Kentish Town
Also in Kentish Town
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Quotes for external mastic in Kentish Town
We quote each job individually. These are the things that affect it:
- The product the joint needs
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- How easy the joints are to reach
What it costs depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before we start.
What we need to know
Before you ask for a quote, have a think about:
- The type of property
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- Photos by email, if that’s easy
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, call 0345 464 0079 or drop us an email.
Signs you need external mastic in Kentish Town
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Common reasons people contact us are:
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
- Failed sealant between panels on a façade
- Brick movement joints where the sealant has split
In the older streets around Church of the Holy Trinity with St Barnabas, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- What product goes in the joint
- When the joint can take water or movement
- Which colour the sealant will be
- Who turns up on the day
Landlords, agents and businesses in Kentish Town
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Landlords and letting agents in Kentish 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.
External mastic in Kentish Town: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Keats House (about 1.2 miles north-west) nearby, there’s older building stock in the area around Kentish Town as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Kentish Town is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For site and facilities teams at buildings such as Holy Trinity and Saint Silas CofE Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Kentish Town is about 2 miles east of Hampstead, in Greater London. Homes, rented property, offices and hotels in Kentish Town is covered for external mastic. The work is guaranteed for a year. Kentish Town is one of 764 towns and villages in Greater London where we work.
Jobs for external mastic in NW5, NW1 and NW3 is quoted and booked the same way as anywhere else. Streets in the area include Eton Road, Oval Road and Regal Lane, and we cover them all. We also cover Chalk Farm (1 mile west), Camden Town (1 mile south-east), Gospel Oak (1 mile north), Primrose Hill (1 mile south-west) and Agar Town (1 mile south-east). We also work in nearby towns such as London (4 miles south-east), Kensington (4 miles south-west), Shoreditch (3 miles south-east), Walthamstow (6 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Near you in Kentish Town
In Kentish Town, that means homes and buildings near Primrose Hill, Haverstock School and North Bridge House School, among other places. Also close by are The Hawley Arms (within half a mile south) and Vaughan Williams Memorial Library (0.5 miles south). There’s a railway station in Kentish Town itself: Kentish Town West station. Well-known places in the area include O2 Centre (1.6 miles west) and Montfichet's Tower (2.9 miles south-east). The countryside around Kentish Town includes The Long Water and Primrose Hill.