West Sussex · England

Portslade New Build Mastic

We cover Portslade for plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.

Second-fix sealing on new plots
Cracked caulk along new skirting
New-build shower sealant that has already split

New build mastic for Portslade homes and businesses

Call 0345 464 0079

Get a quick quote

What we cannot put right

We’ll always be straight with you, so here’s what new sealant will not do:

Plumbing faults behind the sealant
Your warranty claim itself, which is between you and the builder
Damaged fittings that need replacing

If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer before you book.

Joints and surfaces we work on

Windows & doors
Skirting & floors
Show homes
Bathrooms & en suites
Kitchens
Plot handovers

How we handle new build mastic in Portslade

Some new-home owners let the house settle before resealing. For small cosmetic gaps, that’s reasonable, but a seal that is letting water through needs doing now. We are often asked to deal with kitchen sealant that has pulled off the wall and cracked sealant around new window and door frames, across skirting & floors, show homes and bathrooms & en suites.

Homes around Portslade range from older cottages to newer houses, and their floors range just as widely, each moving in its own way. The sealant at skirtings and thresholds has to suit the floor it meets.

We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.

Where: Portslade (BN41, BN3, BN42)
Region: West Sussex
Cover: One year on every job
Quotes: A clear quote up front
Call: 0345 464 0079
Last updated: 26 October 2026

Sealant gun close-up on a shower enclosure wall joint

Can I do it myself?

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.

Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.

Quotes for new build mastic in Portslade

Some jobs are bigger than they look, and some smaller. What affects the quote:

The number of rooms or windows
Whether there’s mould to deal with
Access and height
How much old sealant there is and how hard it is to remove

Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.

Helping us quote

Photos by email are helpful but not essential. Try to tell us:

Any access issues, like height or stairs
Where the job is, and your postcode
A few photos by email, if you can
Whether it’s a home or a business

We quote each job on its own. Simply call 0345 464 0079 or send us an email and describe the job, and pictures are welcome.

Why it’s worth doing now in Portslade

A tube of sealant from the DIY shop won’t fix the cause: grit, unprimed surfaces and old layers underneath. Cutting out, cleaning and priming are what make the difference. In an older home around Portslade, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.

Leaving a failed joint usually makes the job bigger, not smaller. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email and we will give you an honest view and a quote.

Why book with us

Homes, businesses and hotels
20+ years of sealant experience
We are fully insured
We agree the colour with you first

See how sealant jobs are priced and customer reviews.

Your questions about new build mastic in Portslade

Is Portslade within the area you cover?

Yes, Portslade is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.

Do you cover Portslade for new build mastic?

Yes. We work across London and the South East, and Portslade is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.

Where is Mr Mastic based?

We are a Crawley-based firm. We work across South East England, London and Scotland.

Can you work from my snagging list?

Yes. Send it with photos and we will quote for the sealant items. If something isn’t sealant, we’ll say so.

Why has my new-build shower seal failed already?

Lots of new homes see sealant crack early. Poor preparation at handover adds to it.

Is it worth trying it myself?

It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.

What do you put in the joint?

Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.

Are you fully insured?

Yes, we are fully insured for every job we do.

What the job involves on each 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 and baths are filled before sealing.

Kitchens

Beside the sink, the joint takes water every day. We use a sealant suited to kitchens, food-safe where it’s needed.

Also near Portslade

What else we do in Portslade

Elsewhere in West Sussex

New Build Mastic in every one of the 371 towns and villages in West Sussex
Every service in West Sussex
All areas
More about new-build mastic & snagging

New homes and floors in Portslade

Portslade is within about 1 mile of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so it’s worth checking at snagging. 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.

For new homes near Fishersgate station, it’s worth checking the sealant early, while snags are still fresh.

Portslade is about 1 mile west of Brighton and Hove, in West Sussex. Portslade gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Portslade is one of 371 places in West Sussex we cover for new build mastic.

Jobs for new build mastic in BN41, BN3 and BN42 is quoted and booked the same way as anywhere else. Local streets include Mill Lane, Crown Road and Drove Road, all of which we cover. Portslade sits on or near the A293, so getting to you is simple. If you are just outside Portslade, we cover Hangleton (1 mile north-east), Southwick (1 mile south-west), Kingston by Sea (1 mile west), Shoreham-by-Sea (2 miles west) and Old Shoreham (3 miles west). Further out, we also cover Worthing (8 miles west), Haywards Heath (12 miles north-east), Burgess Hill (9 miles north-east), Littlehampton (14 miles west), Lancing (5 miles west) and Rustington (13 miles west).

Local landmarks in Portslade

Locally, jobs take us to homes and businesses close to King's School, Benfield Hill and The Mill House and the streets around them. The closest station to Portslade is Fishersgate station, roughly 0.7 miles south of the centre. Well-known places in the area include British Engineerium (1.8 miles east) and Southlands Hospital (1.8 miles west). Not far away are Shoreham Beach and Thundersbarrow Hill.

How the visit works

We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the number of plots. For a job in Portslade, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.

First we work through your snagging list or plot schedule with you.
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.

Before we arrive

Let us know if you’ve seen damp or leaks
Tell us about access, such as stairs, a lift or high-level joints
Mention any parking rules near the property

Ask for a quote

Need a quote? Please call 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.

Get a price