Greater London · England
External Mastic in Kevington
External mastic in Kevington from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Leaking joints around cladding and façade panels
Kevington: your questions answered
Can you do external mastic in Kevington?
Yes. We work across London and the South East, and Kevington is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Do you work for landlords with property near St Mary Cray station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Are you insured?
Yes, we’re fully insured.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Do you remove the old sealant?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Can a movement joint be filled with mortar?
No. Rigid materials cannot move with the wall and the joint fails. If it has already been filled, we can normally cut it out and reseal it.
How long does external mastic take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will say how long yours will take.
External mastic in Kevington
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. We work on façade panels, brickwork movement joints and concrete & block, and common reasons people get in touch are sealant that has lost its bond to the brick or render and leaking joints around cladding and façade panels.
Outside work in London starts with access: side passages, upper floors and where to park. In Kevington, joints up high may need ladders or other access, which is worth talking through when you book.
Big or small, it’s backed by our one-year guarantee.
- Where
- Kevington (BR5)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Kevington
Also in Kevington
What affects the cost of external mastic
You will get a clear quote before work begins. It takes into account:
- The type of sealant required
- The size of the job
- When we can work, for business premises
- Whether the work is at height
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
What to tell us when you ask for a quote:
- How we’d reach the joints
- Photos by email, if that is easy
- Whether it’s a home or a business
- The rough size of the job
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
The process
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a few hours for a handful of joints, longer for a whole elevation. In Kevington, 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.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
- Keep pets and children clear of the area while we work
Get a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Read more
Honest limits
New sealant can’t fix everything, and we’ll tell you before any work starts. Sealant won’t put right:
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
- Damp that is not coming from the joint
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before you book.
Joints and surfaces we work on
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Surface by surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
External mastic in Kevington: local notes
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. With historic houses such as Lullingstone Castle (about 3.2 miles south-east) nearby, there’s older building stock in the area around Kevington 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.
Homes close to Unity Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near St Mary Cray station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Kevington is about 1 mile east of Orpington, in Greater London. Anywhere in BR5, we can carry out external mastic at your property. Across Greater London, we cover 764 places, Kevington among them. We also work in London, around 13 miles away.
Here we cover the BR5 postcode area for external mastic. If you need external mastic at a property on Crockenhill Road and Sheepcote Lane or a nearby road, our applicators can take on the job. We also cover the places around Kevington: Derry Downs (1 mile west), Crockenhill (1 mile east), St Mary Cray (1 mile west), Orpington (1 mile west) and Poverest (2 miles west). Within a short drive, we also cover London (13 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), St Pancras (15 miles north-west), Shoreditch (13 miles north-west) and Walthamstow (15 miles north-west).
Local landmarks in Kevington
Typical jobs here are in homes near The Priory School and Harris Academy Orpington and the streets around them. Kevington’s nearest station is St Mary Cray station, about 1.4 miles north-west of the centre. Other landmarks nearby include Lullingstone Castle (3.2 miles south-east) and London Borough of Bromley Museum (1.5 miles west). Not far away are Summer Hill and The Warren.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, 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.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Signs you need external mastic in Kevington
If plants are growing out of a joint, the sealant has usually failed or was never there. Roots and dirt hold water against the wall.
Keep an eye out for any of the following:
- Panel joints letting water in
- Damp patches traced to an open external joint
- Sealant that has lost its bond to the brick or render
- Hard, crazed mastic that has stopped moving
As a London address, Kevington can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- How the colour is chosen
- What insurance they hold
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why