Brighton and Hove · England
External Mastic in Brighton
We cover Brighton for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Movement joints filled with mortar instead of sealant
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
Questions from Brighton
Do you work for landlords with property near London Road (Brighton) station?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Does living near the coast affect external mastic in Brighton?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
What should I tell you?
A short description and the location. We will ask anything else we need to know.
What does external mastic cost?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Are you insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Do you use backing rod?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
External mastic for homes and businesses in Brighton
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you’re dealing with weeds or debris growing in open joints and movement joints with cracked, split or missing sealant, we can put it right, on concrete & block, copings & trims and brickwork movement joints alike.
In a large town like Brighton, plenty of buildings are rented or managed, and outside joints are easy to forget. The first sign is usually a dripping gutter end or a stain below a failed joint.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Location
- Brighton (BN1, BN2, BN3)
- Wider area
- Brighton and Hove
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes a few hours to a few days, depending on the length of joint and the access in most cases. Where a business in Brighton needs to stay open, out-of-hours working can be arranged, while home visits are arranged within our normal working hours, Monday to Saturday.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
- Tell us about any water getting in
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or drop us an email.
Related advice
Brighton buildings and the weather
Brighton is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Fairlight Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near St Martin's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Letting a property close to London Road (Brighton) station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Brighton is in Brighton and Hove. Across the BN1 area, we can carry out external mastic at your property. We cover 30 towns and villages across Brighton and Hove, from the larger towns to small villages.
All of BN1, BN2 and BN3 is within our area for external mastic. Streets in the area include London Road, Isetta Square and Pelham Square, all of which we cover. Main roads around Brighton include the A23 and A259. If you’re just outside Brighton, we cover Hanover (1 mile south), Carlton Hill (1 mile south), West Hill (1 mile west), Hollingdean (1 mile north) and Seven Dials (1 mile west). Within a short drive, we also cover Brighton and Hove (3 miles west), Aldrington (3 miles west), Hangleton (3 miles west), Saltdean (4 miles south-east), East Saltdean (5 miles south-east) and Rottingdean (3 miles south-east). Brighton is one of the larger places we cover in Brighton and Hove.
What’s near Brighton
In Brighton, that means homes and buildings near Brighton Hove and Sussex Sixth Form College, William Clarke Park and Park Crescent pub, among other places. Brighton has its own railway station: London Road (Brighton) station. Well-known places in the area include Brighton General Hospital (0.7 miles east) and Old Police Cells Museum (1 mile south-west). The countryside around Brighton includes Newmarket Hill and Whitehawk Hill.
Leave it or put it right?
Sealing over the top of old mastic doesn’t hold for long. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. In a busy place like Brighton, a failed joint in a flat or office can send water into the space below, where it’s often found late and is bigger to put right.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why us?
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
- Homes, businesses and hotels
- Neat joints and a tidy finish
Take a look at how sealant jobs are priced and customer reviews.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that isn’t coming from the joint
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Façade panels
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
Surface by surface
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.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it and keep the sealant to the right depth.
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Walk round the building once a year and look at the joints
- Show decorators and builders where the movement joints are
- Leave the joints unpainted unless we have said otherwise
- Wash walls gently around the sealant
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
For landlords and businesses
For anyone letting property in or around Brighton, several properties can be quoted together. Send us the addresses and the work at each.
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.