Commercial Sealant Contractors in Portsea
Sealant work for offices, shops, hotels and other commercial buildings across Portsea, carried out by CSCS-carded applicators. Fully insured and CHAS accredited.
- Sanitary sealant that has gone black and patchy
- Messy, uneven beads from earlier work that let the building down
- Greasy, split joints in a kitchen or tea point
Commercial sealant contractors in Portsea
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Commercial sealant contractors in Portsea, done properly
On older buildings, particularly those put up before 2000, some old mastics and sealants may contain asbestos. We ask to see the asbestos register or survey before old sealant is disturbed. Anything suspect is left alone until it has been tested. If you are dealing with frame sealant that has cracked, shrunk or pulled away and messy, uneven beads from earlier work that let the building down, we can help, whatever the surface. Searching for sealant specialists in Portsea? Mastic Doctor has worked for contractors, FMs and building owners since 2005.
In an occupied building in Portsea, the job is planned so areas stay in use: washrooms in turn, floors in sections and entrances kept open.
Around smaller places such as Portsea, small firms often work from converted barns, yards and rural units. Old masonry and timber meet new glazing and partitions in these buildings, and every junction needs a sealant that suits it.
A 12-month guarantee applies to all our work in Portsmouth. Should something we installed fail, ring 01277 525 020 or send details through our quote form and we’ll come back to it.
- Location
- Portsea (PO1, PO12, PO5)
- Wider area
- Portsmouth
- Guarantee
- 12 months on every job
- Quotes
- Quoted before any work starts
- Call
- 01277 525 020
- Page updated
- 3 November 2026
What sets the cost
Sealant work doesn’t have a standard rate, because every site is different. What we look at:
- How much there is to seal
- Removal of failed or old sealant
- The size and state of each joint
- Location, for remote and island sites
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.
Details that help us quote
A good diagnosis starts with the right details. Let us know:
- The site address and postcode
- Your programme or deadline
- Rough lengths or quantities, or drawings if you have them
- What the building is and how it’s used
Send us photographs, drawings or a joint schedule are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.
Leave it or put it right?
Putting off a reseal usually moves the cost rather than avoiding it. Water past a frame perimeter or a washroom joint can reach plasterboard, insulation, floor coverings and the ceiling below, which brings decorators and flooring contractors into the repair. Resealing while only the sealant has failed keeps the job small. Sealant hardens, cracks and loses grip with age, UV and movement. Renewing it in good time keeps the building weathertight.
There’s no price list, since every building and every scope is different. For a fixed figure, call for a quote and we’ll price your job on its own details.
Why us?
- CSCS-carded applicators
- Commercial sealant work since 2005
- Products installed to the manufacturer’s instructions
- Public liability insurance in place
See what affects the cost or our accreditations and insurance.
What Portsea’s businesses ask us to seal
Portsea sits close to the coast, within about 1 mile. Buildings near the sea put their external joints through more driven rain, with salt air nearer the beach. Sea-facing elevations are usually where failed joints show first. Portsea is in the South East, one of the UK’s drier regions. External joints still need dry faces and the right temperature, and damp or frosty mornings can hold work up.
Refits at hotels like The Ship Leopard Boutique Hotel, under half a mile south of Portsea, bring joints at vanity tops, bars and reception desks that guests see every day. Premises within reach of Portsmouth Harbour station (less than half a mile south-west of Portsea) often have busy frontages where joints are seen by everyone passing.
Portsea is about 1 mile south-west of Portsmouth, in Portsmouth. Our applicators travel to Portsea for work on sealant joints, handled exactly as we handle every other area. We work across 19 places in Portsmouth, large and small.
If you need commercial sealant contractors in PO1, PO12 and PO5, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Buildings on Main Road, Park Road and Scott Road are within our area for sealant joints. Nearby places we also cover include Portsmouth Point (1 mile south), Clayhall (2 miles south-west), Haslar (2 miles south-west), Alverstoke (2 miles south-west) and Privett (2 miles west) for sealant joints. A short drive away, we cover Hilsea (3 miles north-east), Wymering (4 miles north-east), Paulsgrove (4 miles north), Cosham (3 miles north-east), Drayton (4 miles north-east) and Farlington (5 miles north-east).
Local landmarks in Portsea
In Portsea, that means premises near The Ship & Castle pub, St Jude's CofE Primary School and Charter Academy. Portsea has its own railway station: Portsmouth Harbour station. Nearby you will also find Royal Portsmouth Hospital (0.8 miles east) and Genesis Expo Creationist Museum (less than half a mile south). Not far away are Milton Locks and Portsdown Hill.
Our process
We begin with a short walk round with whoever looks after the building, to confirm the scope, the order of work and any areas we must keep clear. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. Several jobs near Portsea can be grouped on one trip. Mention the building’s opening times and we will work within them.
- You send photographs, drawings or a list of the joints and areas involved, or we arrange a site visit.
- The failure is diagnosed and a fixed quote issued for the work agreed.
- Site hours, access windows and the order of areas are agreed before we start.
- The failed bead is removed and the joint faces cleaned until they’re sound and dry.
- We fit backing to the right depth, prime where specified and lay the new bead.
- Each area is inspected, signed off and backed by our 12-month guarantee.
Getting the site ready
- Tell us what induction or permit system the site runs
- Explain the parking and delivery arrangements
- Agree which areas must stay open
Ask for a quote
Specifications, drawings and tender packages are welcome with any enquiry, and we will price against exactly what is specified. For smaller jobs, photos and a description will do.
Read more
Questions we’re asked in Portsea
Does the sea air around Portsea change the choice of sealant?
It can. Driven rain and salt are tougher on outside sealant than sheltered inland conditions. Product choice and preparation matter more, and sea-facing elevations are worth inspecting more often.
Is Portsea off your patch?
No. Places such as Portsea are covered as much as the big towns. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.
Can you follow the specification on our project?
Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it.
Who decides which product is used?
The specification comes first, if there is one. Without one, the joint decides: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
Is it OK to apply fresh sealant over existing beads?
Every failed bead is cut out completely. Laying new silicone on old gives it nothing to grip; the faces are then cleaned and prepared.
Can you supply RAMS and insurance details?
Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote. We hold CHAS accreditation and Constructionline membership and carry five million pounds of public liability insurance.
Could the old sealant in an older building contain asbestos?
We check the asbestos register or survey before any old sealant is disturbed. The duty to manage asbestos sits with the dutyholder, and we don’t remove asbestos-containing materials.
What sealant work can’t fix
Sealant solves a lot, but not everything, and we’d rather tell you before you spend money. These need a different solution:
- Cracking that needs a structural engineer to look at it
- Misted, cracked or failed glazing units (a glazier’s job)
- Suspect materials that need testing and specialist removal
If in doubt, call the office on 01277 525 020 or email drawings and photos and we’ll say what we think.
Surfaces we seal
- Movement joints in walls and floors
- Window and door perimeters
- Washrooms and tea points
- Floor and threshold joints
- Kitchen worktops and splashbacks
- External facade joints
Also near Portsea
Other services in Portsea
When to call us in Portsea
A split down the middle of the bead tells a different story. That normally means the joint stretched further than the product could cope with because the bead was too thin, the joint over-stretched or the movement class wrong. Replacing it like for like rarely holds.
Most enquiries start with something like this:
- Mouldy silicone around WCs, urinals and vanity tops
- Shrunken sealant along kitchen worktops and splashbacks
- Damp patches where an external joint has failed
- Frame sealant that has cracked, shrunk or pulled away
Sites a few miles apart, such as Victory Retail Park and Cranbourne Industrial Estate, can share one programme and one point of contact.
What to look for in a quote
- Will CSCS-carded applicators be on site?
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- What level of public liability insurance do they hold?
- Health and safety accreditation such as CHAS
Keeping the joints sound
To get the most from the new sealant:
- Keep a record of which joints were resealed and when
- Check sealant as part of routine building inspections
- Keep washroom and kitchen extraction working
- Keep abrasive pads and scrapers off resealed joints
Later works are the usual way new joints get damaged. When fittings are moved or cabling added, the sealant nearby is easily disturbed and the joint gets left open. Where work has disturbed a joint, just ring 01277 525 020 or email us for a quote.
Movement joints that fill with debris stop working. The joint can no longer close, so its edges crack or spall. At that point it’s a repair job rather than a reseal.