West Sussex · England
New-build mastic & snagging in Thorney Island, West Sussex
Plot mastic for developers and snagging failed sealant in new homes in Thorney Island, with a one-year guarantee on every job. Ask us for a quote.
- Kitchen sealant that has pulled off the wall
- Gaps opening as the house dries out and settles
- Sealant applied over dusty or wet surfaces
Keeping the joints in good condition
After the cure time, these simple habits help:
- Look at the sealant regularly in the first couple of years
- Follow the cure time we give you
- Keep pictures and emails about snagging items
- Clean sealant with mild detergent, not abrasives
Clean the sealant with a mild detergent and a soft cloth. Avoid abrasive pads and strong solvents, which can damage the surface.
Mould takes hold quickly in sealant that has gaps or lifted edges. Resealing before mould gets in keeps the job straightforward.
How we handle new build mastic in Thorney Island
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. Typical jobs include smeared, uneven beads picked up at snagging and beads laid onto grit and dust from the build, on windows & doors, show homes and skirting & floors.
Around Thorney Island, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Thorney Island (PO10)
- Region
- West Sussex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Your warranty claim itself, which is between you and the builder
- Cracking that points to a structural problem
- A tray or bath that is not properly supported, until it’s fixed
If you’re not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer before booking.
What we seal
- Bathrooms & en suites
- Skirting & floors
- Windows & doors
- Kitchens
- Plot handovers
- Show homes
The process
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before we start. The work generally takes a few hours for most snagging lists, longer for a run of plots. In a small place like Thorney Island, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- Failed or untidy sealant is cut out completely.
- Each joint is cleaned of dust and grit, then primed if required.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
How to prepare
- Mention any tricky access
- Move anything stored near the joints
- Keep children and pets away from the work area
Getting a quote
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Advice
Landlords, agents and businesses in Thorney Island
Letting agents and landlords in Thorney Island can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Nearby places to Thorney Island
Other services in Thorney Island
What we are called out for in Thorney Island
Sealant is often one of the last jobs before handover. Joints aren’t always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
Look out for these signs:
- Kitchen sealant that has pulled off the wall
- Beads laid onto grit and dust from the build
- Skirting joints opening in the first winter
- Leaking shower tray seals in a new home
For new homes near Southbourne station, it’s worth checking the sealant early, while snags are still fresh.
Before booking anyone
- What happens if they find a problem under the old sealant
- Who turns up on the day
- How the surfaces are prepared before sealing
- How long the guarantee is
Common questions in Thorney Island
Do you work for landlords with property near Southbourne station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Do you cover Thorney Island for new build mastic?
Yes, Thorney Island is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Should I wait before resealing?
Any seal that is leaking should be redone straight away. For small cosmetic gaps, waiting until the house has settled can save doing them twice.
Can I send you my snagging list?
Yes. We often work straight from a snagging list. We agree the sealant items with you before work begins.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so the joint is cleaned back first.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
How long does new build mastic take?
A typical job takes a few hours for most snagging lists, longer for a run of plots, including the preparation. We will confirm how long when we quote.
What new build mastic looks like in Thorney Island
Thorney Island is within about 1 mile of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so any gaps are best picked up early. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around Thorney Island, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Thorney Island is about 4 miles south-east of Havant, in West Sussex. For new build mastic in and around Thorney Island, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover West Sussex, Thorney Island included. Our West Sussex coverage runs to 371 places, Thorney Island among them. We also work in Portsmouth, around 7 miles away.
We work across PO10 for new build mastic. You will find streets such as Hunter Road, Emsworth Road and Spartan Close, all of which we cover. Neighbouring places we cover for new build mastic include West Thorney (1 mile south-east), North Hayling (1 mile west), Tye (1 mile south-west), Northney (1 mile west) and Emsworth (2 miles north). We also work in nearby towns such as Bognor Regis (11 miles east), Chichester (7 miles east), Selsey (9 miles south-east), Portfield (7 miles east), Yapton (14 miles east) and East Wittering (5 miles south-east).
Near you in Thorney Island
Locally, jobs take us to homes and businesses close to Bourne Community College and Eames Farm and the streets around them. For rail, the closest station is Southbourne station, roughly 1.8 miles north-east of the centre. Well-known places in the area include Havant War Memorial Hospital (3.2 miles north-west) and Emsworth Museum (1.6 miles north). Green spaces nearby include Nutborne Marshes.
Why it’s worth doing now in Thorney Island
Resealing everything on a snagging list in one visit is normally simpler than chasing joints one at a time. It’s one visit, one quote and one set of cure times to plan around. Where a wall is exposed, as many are in small places like Thorney Island, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why choose Mr Mastic in Thorney Island
- Every job guaranteed for a year
- We are fully insured
- We never seal over old sealant
- Domestic, commercial and hotel work
Read how sealant jobs are priced and our reviews.
What affects the cost of new build mastic
The price is agreed before any work begins. It’s based on:
- Whether there’s mould to deal with
- How much there is to do
- Access and height
- Which sealant suits the joint
Combining jobs into one visit generally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Where the property is
- Photos by email, if that is easy
- Any access issues, like height or stairs
- Whether it’s a home or a business
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job and send photos if you have them.