West Sussex · England
Colworth New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for Colworth, backed by a one-year guarantee. Ask us for a quote.
- Plot mastic for developers ahead of handover
- Shower seals failing in the first year or two
- Smeared, uneven beads picked up at snagging
How we handle new build mastic in Colworth
Developers send us the plot schedule and we work through it. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover with a sealant suited to each area. We work on windows & doors, bathrooms & en suites and plot handovers, and the jobs we see most are new-build shower sealant that has already split and skirting joints opening in the first winter.
Older homes in small places like Colworth often have timber floors that move with the seasons, which is why skirting and threshold joints need a flexible sealant, not filler.
Your job is guaranteed for a year, as with all our work.
- Place
- Colworth (PO20)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Colworth
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 Colworth, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why Colworth clients choose us
- Over 20 years’ experience
- Homes, businesses and hotels
- White, clear, grey or another colour, product permitting
- ARBOMaster approved applicator
Read our cost guide and our reviews.
Signs you need new build mastic in Colworth
Not every new-build joint gets the right sealant: caulk where water collects, or a rigid product on a moving joint. Both fail early.
Common reasons people contact us are:
- New-build shower sealant that has already split
- Sealant work across a run of new homes
- Beads laid onto grit and dust from the build
- Gaps between new skirting and floors
Around Colworth, as everywhere, new build mastic is only as good as the preparation behind it.
Comparing quotes
- Is VAT in the price?
- Who turns up on the day
- Whether they seal over old material or remove it
- How the surfaces are prepared before sealing
New homes and floors in Colworth
Colworth 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. 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.
If you’ve bought a new home near Bognor Regis station, the sealant around baths, showers and frames is worth checking in the first year or two.
Colworth is about 2 miles north of Bognor Regis, in West Sussex. If you need new build mastic in Colworth, please phone 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover West Sussex. Our West Sussex coverage runs to 371 places, and Colworth is one of them. You can also see our page for Portsmouth, about 16 miles away.
Here we cover the PO20 postcode area for new build mastic. Nearby, we also carry out new build mastic in Merston (1 mile west), Oving (2 miles north-west), Lagness (2 miles south-west), Runcton (2 miles west) and Shopwyke (2 miles north-west). Further out, we also cover Worthing (13 miles east), Chichester (4 miles north-west), Selsey (7 miles south-west), Littlehampton (8 miles east), Emsworth (10 miles west) and Rustington (9 miles east).
What’s near Colworth
Locally, jobs take us to homes and businesses close to The Regis School and The Brooks Local Nature Reserve, among other places. The nearest railway station is Bognor Regis station, roughly 2.5 miles south-east of the centre. Nearby you will also find Bognor Regis Museum (2.7 miles south-east) and Tote Copse Castle (1.3 miles north-east).
What the job involves on each surface
Show homes
We can refresh show-home sealant that has discoloured or been knocked. We cut it out and reseal neatly.
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
What affects the cost of new build mastic
Jobs vary more than people expect. What affects the quote:
- The number and length of the joints
- How easy the joints are to reach
- Any working-time requirements on site
- Any mould that needs treating
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will go through it with you.
Helping us quote
To help us quote quickly, please include:
- Where the property is
- The rough size of the job
- Any access issues, like height or stairs
- Whether it’s a home or a business
Asking for a quote is easy: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand.
What we do, step by step
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours in a single home. Somewhere as small as Colworth, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Preparing for the visit
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we are working on
Getting a quote
There’s no standard price list. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or send us an email.
Advice
Questions from Colworth
Can you do new build mastic in Colworth?
Yes, Colworth is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Do you cover smaller places like Colworth?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you use white or clear sealant?
White and clear are the most common, but other colours are available. We match the colour to the finish.
Where do you work from?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
How much does new build mastic cost in Colworth?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
How long does the job take?
Typically it takes anything from a few hours to several days, depending on the number of plots. Larger jobs naturally take longer.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.