Greater London · England
External Mastic in Primrose Hill
Sealing brickwork movement joints, render, cladding and façade joints in Primrose Hill, with a one-year guarantee on every job. Call for a quick quote.
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Movement joints filled with mortar instead of sealant
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracks in the bricks or render themselves, away from the joints
- Render that’s blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Copings & trims
- Concrete & block
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
How we handle external mastic in Primrose Hill
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. We work on copings & trims, façade panels and joints between brick and frames, and the jobs we see most are joints with sealant missing in places and rigid filler in a joint that should flex.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. 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.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Where
- Primrose Hill (NW3, NW1, NW8)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Primrose Hill
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Landlords and letting agents in Primrose Hill 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.
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Primrose Hill, the repair is bigger than a sealant job.
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
Why book with us
- Tidy, careful work
- Full insurance on every job
- Quality sealants from Arbo and Everbuild
- Every job guaranteed for a year
Read how sealant jobs are priced or our reviews.
Places near Primrose Hill
Other services in Primrose Hill
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- Whether old sealant or filler has to be cut out
- The type of sealant required
- The number and length of the joints
- Any mould that needs treating
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will explain what it covers.
What to tell us for a quote
What to tell us when you ask for a quote:
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
- Photos by email, if that’s easy
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Outside joints around Primrose Hill
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. Historic houses like Winfield House (about 0.7 miles south) are a reminder that the area around Primrose Hill 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.
Managing a site like St Paul's Church of England Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Church of St Mary the Virgin, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you let a flat or house near Kentish Town West station, split movement joints are easy to miss on a rental until damp shows inside.
Primrose Hill is about 1 mile south-east of Hampstead, in Greater London. Whether you are in the middle of Primrose Hill or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. 764 places in Greater London are on our list.
We cover every part of the NW3, NW1 and NW8 postcode area for external mastic. Local streets include Eton Road, Oval Road and Regal Lane, and we cover them all. You will find Primrose Hill on the A5205, which makes it straightforward to reach. Other places close to Primrose Hill include Haverstock (1 mile north), Belsize Park (1 mile north), Chalk Farm (1 mile north-east), South Hampstead (1 mile west) and Swiss Cottage (1 mile west). Further out, we also cover London (4 miles south-east), Kensington (3 miles south-west), Shoreditch (4 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
What’s near Primrose Hill
Locally, jobs take us to homes and businesses close to Cecil Sharp House, Haverstock School and Regent's Park. You will also find St. Mary's Town and Country School (0.5 miles north-west) and Princess of Wales pub (under half a mile east). For rail, the closest station is Kentish Town West station, about 0.7 miles north-east of the centre. Nearby you’ll also find Montfichet's Tower (3.1 miles south-east) and Wellington Hospital (0.7 miles south-west). Open spaces near Primrose Hill include Parliament Hill and Adelaide Nature Reserve.
Common questions in Primrose Hill
Do you work for landlords with property near Kentish Town West station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Is parking a problem for a job in Primrose Hill?
Parking in Primrose Hill, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
How do I get a quote for external mastic in Primrose Hill?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or drop us an email with a short description of the job.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Can you seal joints between two different materials?
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.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.
Can I add another job to the visit?
Yes, we can. More than one area can go on one quote.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep water from gutters off the wall
- Never let anyone fill a movement joint with mortar
- Walk round the building once a year and look at the joints
- Get split or bare joints resealed while the damage is small
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
How it works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. For a job in Primrose Hill, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Let us know about stairs, lifts or work at height
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.
Advice
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.