Greater London · England
Kidbrooke External Mastic
Professional external mastic in and around Kidbrooke, with old sealant always removed completely and a one-year guarantee.
- Brick movement joints where the sealant has split
- Cracked joints where brick meets render or frames
- Panel joints letting water in
External mastic in Kidbrooke, done properly
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. If you’re dealing with joints where the bead has come unstuck and water getting into walls through failed joints, we can put it right, whatever the surface.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Kidbrooke (SE3, SE9, SE18)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. 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 Kidbrooke, the repair is bigger than the sealant job would have been.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal sanitary silicone in wet areas
- Neat joints and a tidy finish
- An ARBOMaster approved applicator
Take a look at what affects the cost or our reviews.
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How it works
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours to a few days, depending on the length of joint and the access. For a job in Kidbrooke, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Let us know about stairs, lifts or work at height
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or drop us an email.
Related advice
Common questions in Kidbrooke
Is parking an issue for external mastic in Kidbrooke?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you help a landlord with a rental near Kidbrooke station?
Yes, we work for letting agents and landlords. 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.
How much does external mastic cost in Kidbrooke?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
What do you need from me for a quote?
A short description and the location, with pictures by email if possible. If we need more, we’ll ask.
Do you cover Kidbrooke?
Yes. We cover Kidbrooke. For a quote, ring 0345 464 0079 or send us an email.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
How the job changes by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
When it is not the sealant
New sealant can’t fix everything, and we will tell you before any work starts. Sealant won’t put right:
- Failed render or damaged cladding panels
- Cracks in the bricks or render themselves, away from the joints
- Adding movement joints to masonry that has none
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Kidbrooke
- Façade panels
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
Walls and rooflines in Kidbrooke
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
Kidbrooke is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Schools such as Henwick Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Kidbrooke is about 2 miles north of Eltham, in Greater London. We carry out external mastic for homes and businesses in Kidbrooke and the surrounding area, as part of our work across Greater London. Our Greater London coverage runs to 764 places, and Kidbrooke is one of them. Our London page covers work nearby, about 6 miles away.
Work in SE3, SE9 and SE18 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Brome Road, Briset Road and Nesbit Road or anywhere close by, we can help. We also cover the places around Kidbrooke: Well Hall (1 mile south-east), Shooter's Hill (1 mile east), Middle Park (1 mile south), Horn Park (1 mile south-west) and Blackheath (1 mile west). Within a short drive, we also cover London (6 miles west), City of Westminster (9 miles west), Marylebone (9 miles north-west), Kensington (11 miles west), St Pancras (8 miles north-west) and Shoreditch (7 miles north-west).
Around Kidbrooke
Locally, jobs take us to homes and businesses close to Thomas Tallis School, The Halley Academy and Eltham Common and the streets around them. For rail, the closest station is Kidbrooke station, about 0.7 miles west. A little further out are Brook General Hospital (0.5 miles north-east) and Lewisham Shopping Centre (2.4 miles west). For a walk, there’s Birdbrook Road Nature Reserve and Summer Hill.
What we’re called out for in Kidbrooke
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Signs it’s time to call us include:
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
- Failed sealant between panels on a façade
Rented homes near Kidbrooke station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- Which colour the sealant will be
- Is the old sealant removed completely?
- What insurance they hold
- What product goes in the joint
Places near Kidbrooke
Also in Kidbrooke
What affects the quote in Kidbrooke
You will get a clear quote before work begins. It’s based on:
- The type of sealant required
- The old material and how stubborn it is
- Working hours on commercial sites
- Whether there’s mould to deal with
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and give you a clear quote before work begins.
Helping us quote
When you contact us, it’s useful to know:
- Where the property is
- How we’d reach the joints
- Whether it’s a home or a business
- Roughly how big the job is
For external mastic in Kidbrooke, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.