West Sussex · England
External Mastic in Sompting
Problem with your movement joints in Sompting? We cut out the old, prepare the joints and apply the right sealant.
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
- Joints with sealant missing in places
External mastic for homes and businesses in Sompting
For buildings in Sompting, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on concrete & block, façade panels and copings & trims, and people most often call us about movement joints filled with mortar instead of sealant and panel joints letting water in.
Homes around Sompting range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
You get a 12-month guarantee, the same in Sompting as everywhere else we work.
- Where
- Sompting (BN15)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in Sompting
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Around Sompting, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Why us?
- Any old sealant cut out fully, not covered over
- You choose the colour before work begins
- Rated 4.9 stars on Google
- Every job guaranteed for a year
Read what affects the cost and our reviews.
Places near Sompting
Other services in Sompting
What affects the cost of external mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- The product the joint needs
- How easy the joints are to reach
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or email us.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- Whether it has been sealed before
- The address or postcode of the job
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
If you are in Sompting and need external mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
How the job changes by surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
When it is not the sealant
A few problems are outside what sealant work can do:
- Adding movement joints to masonry that has none
- Cracks in the bricks or render themselves, away from the joints
- Damp that is not coming from the joint
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Sompting
- Copings & trims
- Render & cladding joints
- Façade panels
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
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.
Sompting: your questions answered
I let a flat near Lancing station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Is Sompting within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Is it OK to fill a movement joint with cement?
No. Rigid materials cannot move with the wall, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job.
How the visit works
At the end, we look at the finished work together. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on the amount of work. For a job in Sompting, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
Get a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Read more
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Sompting and across West Sussex. Several sites can be quoted together, and we are fully insured.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
Walls and rooflines in Sompting
Sompting is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Peter the Apostle, an extension built onto an older house moves differently, and the joint between them takes the strain. Letting a property close to Lancing station? Then split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Sompting Village Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Sompting is about 3 miles east of Worthing, in West Sussex. We carry out external mastic for homes and businesses in Sompting and the surrounding area. 371 places in West Sussex are on our list, from the larger towns to small villages. There’s also a page for Brighton, about 9 miles away.
Here we cover the BN15 postcode area for external mastic. Streets in the area include Osborne Drive, Western Road North and Osborne Close, and we cover them all. Close by, we work in Lancing (1 mile east), East Worthing (1 mile south), Broadwater (2 miles west), Offington (2 miles west) and Salvington (3 miles west). Within a short drive, we also cover Bognor Regis (15 miles west), Burgess Hill (13 miles north-east), Littlehampton (9 miles west), Shoreham-by-Sea (3 miles east), Rustington (8 miles west) and Storrington (8 miles north-west).
Landmarks near Sompting
In Sompting, that means homes and buildings near Sompting Abbotts Preparatory School, Brooklands Park and The Sir Robert Woodard Academy. The nearest railway station is Lancing station, about 0.8 miles south-east of the centre. Well-known places in the area include Old Castle (2.4 miles west) and Museum of Sussex Folklore (2.5 miles west). Not far away are Lancing Ring and Widewater Lagoon.