West Sussex · England
Sidlesham New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for homeowners, landlords and businesses in Sidlesham. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Joints pulling apart as timber shrinks
- Smeared, uneven beads picked up at snagging
- Kitchen sealant that has pulled off the wall
New build mastic in Sidlesham, done properly
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that’s letting water through needs doing now. If you have leaking shower tray seals in a new home and smeared, uneven beads picked up at snagging, we can put it right, on bathrooms & en suites, kitchens and plot handovers alike.
In a village or hamlet like Sidlesham, new homes are more likely to be a barn conversion or a handful of houses than a big estate. Each still needs its sealant and floor joints finished properly.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Sidlesham (PO20)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
To keep the joints looking good and working properly:
- Use the extractor fan every time you shower
- Act quickly if a seal starts to leak
- Clean sealant with mild detergent, not abrasives
- Watch for new gaps as the house dries out
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small.
Towns and villages near Sidlesham
More services for Sidlesham
Joints and finishes in Sidlesham homes
Sidlesham is close to the coast. New homes near the sea put their outside mastic to work from day one, so any gaps are best picked up early. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Sidlesham, as everywhere, new build mastic is only as good as the preparation behind it.
Sidlesham is about 3 miles north of Selsey, in West Sussex. Wherever you are in the PO20 postcode area, we can carry out new build mastic at your property. Sidlesham is one of 371 places in West Sussex we cover for new build mastic. There’s also a page for Portsmouth, roughly 13 miles from Sidlesham.
Every address in PO20 is within our area for new build mastic, from the main roads to the quietest streets. If you need new build mastic at a property on Rookery Lane, Selsey Road and Manhood Lane or a nearby road, we can help. You’ll find Sidlesham on the B2145, so it’s easy for us to get to with everything needed for new build mastic. We also cover the places around Sidlesham: Keynor Estate (1 mile south-west), Street End (1 mile north), Sidlesham Common (1 mile north), Fisher (2 miles north-east) and Church Norton (2 miles south). We also work in nearby towns such as Bognor Regis (4 miles east), Chichester (4 miles north), Selsey (3 miles south), Littlehampton (11 miles east), Emsworth (8 miles north-west) and Rustington (12 miles east).
What’s near Sidlesham
The closest station to Sidlesham is Chichester station, roughly 3.9 miles north of the centre. Other landmarks nearby include St Richard's Hospital (4.7 miles north) and Chichester Castle (4.4 miles north).
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Surface by surface
Bathrooms and en suites
Shower trays in new homes often move slightly in the first year. The joint is stripped back before the new bead goes in with baths filled first.
Skirting and floors
Floors and skirting move as the house dries and the heating runs. Caulk cracks; a flexible sealant moves with it in a colour to suit.
Signs you need new build mastic in Sidlesham
The wrong product is sometimes used in the wrong place: caulk where water collects, or a rigid product on a moving joint. Both fail early.
Common reasons people contact us include:
- Messy sealant that spoils new finishes
- Cracked caulk along new skirting
- Sealant work across a run of new homes
- Worktop and upstand sealant coming away
If you’ve bought a new home near Chichester station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- Who turns up on the day
- How long the guarantee is
- What happens if the job turns out different
- When the joint can take water or movement
What happens on the day
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes a few hours in a single home for a typical job. For a village or hamlet like Sidlesham, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Mention any tricky access
- Let us know about parking restrictions
Ask for a quote
Want a quote for new build mastic? Please ring 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
What happens if it’s left?
It often makes sense to do all the sealant items on a snagging list together. It’s one visit, one quote and one set of cure times to plan around. Around Sidlesham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why Sidlesham customers choose us
- Experience in homes, commercial sites and hotels
- A sealant colour to suit the surroundings
- A choice of colours where the product allows
- Trusted Arbo and Everbuild sealants
Read how sealant jobs are priced and our reviews.
How we quote for new build mastic
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The type of sealant required
- Access and height
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
Photos help, but a description is a good start. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
We quote each job on its own. Just phone 0345 464 0079 or drop us an email with the details.
FAQs for Sidlesham
Do you work for landlords with property near Chichester station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Is Sidlesham within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Where do you work from?
We work from Crawley. Our applicators cover Sidlesham, along with the rest of our area.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
Do you use white or clear sealant?
That depends on what the joint meets: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before work begins.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.