West Sussex · England
Sand Mastic in Sompting
Sand mastic across Sompting and nearby, with every bit of old sealant taken out first.
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
- Silicone on a period window that looks wrong
Sompting homes and the weather
Sompting is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around older windows and doors, especially on the side facing the sea. London and the South East are among 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 Sompting Village Primary School, the mastic around its windows and doors needs looking after like any other building’s. Homes close to St Peter the Apostle include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Sompting is about 3 miles east of Worthing, in West Sussex. Anywhere in BN15, we cover sand mastic for homes and businesses. Sompting is one of 371 towns and villages in West Sussex where we work for sand mastic. Our Brighton page covers work nearby (9 miles or so).
All of BN15 is within our area for sand mastic. That includes homes and businesses on Osborne Drive, Western Road North and Osborne Close. Neighbouring places we cover for sand mastic include Lancing (1 mile east), East Worthing (1 mile south), Broadwater (2 miles west), Offington (2 miles west) and Salvington (3 miles west). Further out, 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).
Near you in Sompting
We work in homes and buildings around Sompting Abbotts Preparatory School, Brooklands Park and The Sir Robert Woodard Academy, among other places. The closest station to Sompting is Lancing station, roughly 0.8 miles south-east. A little further out are Old Castle (2.4 miles west) and Museum of Sussex Folklore (2.5 miles west). For a walk, there’s Lancing Ring and Widewater Lagoon.
Sand mastic in Sompting, done properly
Across Sompting, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand for a neat, traditional finish. We work on brick reveals, timber door frames and stone surrounds, and the jobs we see most are silicone on a period window that looks wrong and wind and rain getting in round a sash window.
Houses in smaller places like Sompting can stand more in the open than those in a built-up town. The mastic around frames on those walls tends to age faster.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Sompting (BN15)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Sompting
Also in Sompting
How it works
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for a single window, longer for several, including the tidy-up. For a job in Sompting, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
Getting a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Related advice
Looking after it afterwards
Looking after new joints is easy:
- Renew mastic before redecorating the windows
- Leave the new mastic unpainted
- Ask the planning authority about consent for listed or conservation-area homes
- Ask a joiner to look at soft timber first
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Common problems we fix in Sompting
Most of it is simply age. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
The problems people usually mention when they call are:
- Patchy fillers round a sash window
- Mastic round period door frames that has failed
- Modern sealant on a period surround
- Draughty sash windows at the surround
Rented homes near Lancing station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Before you book anyone
- What the quote includes, VAT included or not
- What product goes in the joint
- Whether you can choose the colour
- What preparation is included
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
For anyone letting property in or around Sompting, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.
Questions from Sompting
Is sand mastic in a coastal place like Sompting any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is Sompting within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Do you offer different sealant colours?
Yes. White, clear and grey are common, and other colours are available, and we will agree it with you first.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Around Sompting, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What you get with us
- Tidy, careful work
- More than 20 years in sealant work
- Old sealant always removed completely
- A 12-month guarantee on all work
What the job involves on each surface
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is usually favoured.
What we cannot put right
It helps to know what we can’t do:
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
- Planning or listed building consent (your local planning authority decides)
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Sompting
- Period & listed homes
- Brick reveals
- Tenement windows
- Sash and case windows
- Stone surrounds
- Timber door frames