Greater London · England
External Mastic in Golders Green
We cover Golders Green for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Panel joints letting water in
- Plants rooting in failed movement joints
- Damp patches traced to an open external joint
External mastic for homes and businesses in Golders Green
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. We pick a colour that sits well with the wall so the line blends in. Typical jobs include moss and dirt in joints with no sealant left and water getting into walls through failed joints, across concrete & block, render & cladding joints and joints between brick and frames.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Golders Green, tell us how high the joints are and how to reach the back of the building.
Every job is covered by a one-year guarantee.
- Where
- Golders Green (NW11, NW2, NW3)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Golders Green: local notes
London and the South East are among the drier parts 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 Heath House (about 1.1 miles south-east) nearby, there’s older building stock in the area around Golders Green as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
As a London address, Golders Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. In the older streets around Church of St Alban the Martyr, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Golders Green is about 1 mile north of West Hampstead, in Greater London. Every kind of property in Golders Green can book us for external mastic. The work is guaranteed for a year. Golders Green is one of 764 places in Greater London where we work for external mastic. There’s also a page for London, about 7 miles away.
Work in NW11, NW2 and NW3 is quoted and booked the same way as anywhere else. External mastic is available to properties on Nant Road, Hoop Lane and Park Avenue. Neighbouring places we cover for external mastic include Temple Fortune (1 mile north), Childs Hill (1 mile south), North End (1 mile south-east), Hampstead Garden Suburb (1 mile north-east) and Vale of Health (1 mile south-east). Within a short drive, we also cover London (7 miles south-east), City of Westminster (5 miles south-east), Marylebone (4 miles south-east), Kensington (5 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles south-east).
Near you in Golders Green
Locally, jobs take us to homes and businesses close to Childs Hill Park, The King Alfred School and The Old Bull and Bush pub. For rail, the closest station is Cricklewood station, about 1.2 miles south-west. Well-known places in the area include Kenwood House (1.3 miles east) and Brent Cross Shopping Centre (1.1 miles west). Open spaces near Golders Green include Parliament Hill and Darland's Lake.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Show decorators and builders where the movement joints are
- Get split or bare joints resealed while the damage is small
- Make sure movement joints are not pointed over
- Keep water from gutters off the wall
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Common problems we fix in Golders Green
Sometimes a movement joint was filled with mortar or a rigid filler. The joint can’t move, so the wall cracks somewhere else instead.
Any of these means the joints need attention:
- Weathered mastic that no longer stretches
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
- Failed sealant between panels on a façade
If you look after a building such as Rimon Jewish Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- How long the guarantee is
- What happens if they find a problem under the old sealant
- How long to leave it before use
- Whether you can choose the colour
FAQs for Golders Green
Is parking a problem for a job in Golders Green?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you work for landlords with property near Cricklewood station?
Yes. We work for landlords and agents as well as homeowners. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Pointing it stops it working. We will reseal it with a flexible sealant.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do you come to Golders Green?
We do. Our applicators work in Golders Green.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Do you guarantee your work?
Yes, always. Each job is guaranteed for twelve months, large or small.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Why it’s worth doing now in Golders Green
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why book with us
- You choose the colour before work begins
- Anti-fungal silicone where joints get wet
- Neat joints and a tidy finish
- Over 20 years’ experience
See what affects the cost or our reviews.
What affects the quote in Golders Green
There’s no set price list, because jobs vary so much. The quote depends on:
- How many rooms, windows or areas are involved
- The type of sealant required
- Access and height
- Mould in or behind the old joints
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
What to tell us for a quote
When you call or email, it’s useful to know:
- If someone has resealed it before
- Any access issues, like height or stairs
- A few photos by email, if you can
- Where the property is
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Honest limits
We’ll always be straight with you, so here’s what new sealant won’t do:
- Cracked brickwork or render that needs a builder or plasterer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Loose or hollow render, which needs re-rendering
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
What we seal
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Concrete & block
Also near Golders Green
More services for Golders Green
Different surfaces, different methods
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so the movement is taken up.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and protects the render itself.
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation, and the area is left clean. In Golders Green, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- 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.
Before we arrive
- Clear the area around the work
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.