Portsmouth · England

Southsea Commercial Sealant

Sealant work for offices, hotels, washrooms and commercial buildings for homes and businesses in Southsea and across Portsmouth. ARBOMaster approved applicators, fully insured, with a one-year guarantee.

  • Shower leaks reaching the floor below
  • Rental bathrooms that need resealing between tenants
  • Sealant failing again soon after quick repairs

Commercial sealant in Southsea

What the job involves on each surface

Student & care accommodation

Empty rooms between terms or tenancies are easy to reseal, though occupied rooms can be done too.

Office washrooms & kitchens

In staff kitchens, we degrease joints before resealing, using a food-safe sealant by sinks where it’s needed.

Commercial sealant for homes and businesses in Southsea

Larger jobs around Southsea start with a walk round the site. After that, you get one clear quote. We work on retail & leisure sites, hotel bathrooms and office washrooms & kitchens, and people most often call us about leaks from showers into rooms or ceilings below and tired sealant in let properties.

If you look after a school, care home, pub or office in Southsea, the sealant in its washrooms and kitchens, and the fire-rated joints around its pipework, all need looking after. Work can be planned around opening hours where needed.

We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.

Where
Southsea (PO5, PO4, PO1)
Wider area
Portsmouth
Guarantee
A year, on every job
Quote
Quoted before any work starts
Phone
0345 464 0079
Updated
26 October 2026
Eleven members of the Mr Mastic team standing in front of branded white vans

Looking after it afterwards

Joint life depends on how it’s used and looked after. Here’s what we suggest:

  • Book larger programmes for quieter times of year
  • Put a squeegee in each shower
  • Keep a record of which rooms were resealed and when
  • Ask cleaners to go gently on the silicone

Keep the extraction running and maintained. Where a room has no window, the fan is what dries it out, and mould comes back faster without it.

Signs to look for: mould, splits, peeling corners or water marks downstairs. When you see them, it’s time to plan a reseal.

When to call us in Southsea

In office kitchens and tea points, joints are wet and wiped all day, so sealant there wears and stains. The worktop and sink edges normally fail first.

Common reasons people contact us are:

  • Split sealant around staff kitchen worktops and sinks
  • Failed floor-level joints in accessible wet rooms
  • Shower leaks reaching the floor below
  • Washroom sealant that looks dirty however often it’s cleaned

Rented homes near Fratton station change hands often, and sealant work can be quoted for a single flat or a whole portfolio.

What your quote should include

  • Whether VAT is included
  • Whether the sealant suits the joint
  • How the joint is cleaned and prepared
  • What guarantee comes with the work

10 questions to ask before you book

Commercial buildings in Southsea

For seaside hotels, guest houses and holiday lets around Southsea, busy months put washrooms and kitchens under pressure, so it’s worth checking the sealant before the busiest weeks. Southsea has hotels and guest accommodation in and around it. For hotels, a room-by-room programme keeps most rooms in use while the work goes on.

If you look after a building such as Craneswater Junior School, washroom and kitchen sealant can be programmed around term times or opening hours. If you look after a church, hall or community building such as St Margaret of Scotland, any kitchen and washrooms need the same sealant care as any other building.

Southsea is about 2 miles south of Portsmouth, in Portsmouth. Wherever you are in the PO5 postcode area, we cover commercial sealant for homes and businesses. Southsea is one of 19 places in Portsmouth we cover for commercial sealant.

All of PO5, PO4 and PO1 is within our area for commercial sealant. If you need commercial sealant at a property on Bath Road, Liss Road and Beach Road or a nearby road, we can help. We also cover the places around Southsea: Milton (1 mile north-east), Fratton (1 mile north), Kingston (1 mile north), Landport (1 mile north-west) and Baffins (2 miles north). Within a short drive, we also cover Hilsea (3 miles north), Wymering (4 miles north), Paulsgrove (5 miles north), Cosham (4 miles north), Drayton (4 miles north) and Farlington (5 miles north).

Around Southsea

Typical jobs here are in homes near The Festing pub, St Edmund's Catholic School and Mayville High School. The nearest railway station is Fratton station, about 0.8 miles north. A little further out are St. Mary's Hospital (1 mile north) and Southsea Castle (1 mile south-west). The countryside around Southsea includes Milton Locks.

Map of Southsea © OpenStreetMap contributors

How it works

A visit follows a simple pattern: we check the joints, protect the area around them, carry out the job and clear up. It normally takes a few hours per room, so whole buildings are phased. Parking in a town like Southsea is usually straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.

  1. We start by looking at the rooms and agreeing what’s needed.
  2. We agree when we will work, with early or out-of-hours slots where they can be arranged.
  3. Each area is protected and stripped of old sealant.
  4. Joints are dried, then resealed and tooled neatly.
  5. We let your team know the cure time for every area.

Getting ready for the visit

  • Tell us if parking is tricky
  • For business premises, tell us about site rules or sign-in
  • Clear items away from the joints we are working on

Ask for a quote

There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.

Get a quick quote

Advice

Should I try it myself first?

A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.

If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.

Landlords, agents and businesses in Southsea

Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.

Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.

Why act early in Southsea

Fixing rooms one complaint at a time is the slow way. A planned programme deals with every room in order, with less disruption and one clear quote. In Southsea, as anywhere, most leaks start as a small gap in a joint, and they’re far easier to fix early.

Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.

Why Southsea clients choose us

  • Tidy, careful work
  • Fully insured
  • Rated 4.9 stars on Google
  • A choice of colours where the product allows

Take a look at how sealant jobs are priced or customer reviews.

Southsea: your questions answered

Do you work for hotels and guest houses in Southsea?

Yes, hotels and guest houses are among the places we work. A room-by-room programme keeps most rooms in use while the work goes on.

Do you cover Southsea for commercial sealant?

Yes, Southsea is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.

Do you work for landlords and agents?

Yes. A planned programme across a portfolio keeps things simple, fitting around access to each property.

Do I have to be there?

It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.

Will there be a smell?

Sometimes, a little. It fades as the sealant cures.

Can you seal over the old sealant?

No, it will not last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.

Can you do several jobs on one visit?

Yes. Just list everything you need and you will get one quote.

How long does commercial sealant take?

That depends on how much there is to do, but as a guide it takes anything from a few hours to several days, depending on the number of rooms. We will give you a better idea when we quote.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job