Construction Mastic in Portchester
Mastic packages for new-build and refurbishment projects throughout Portchester and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Frame perimeters left unsealed or poorly sealed
- Early adhesion failures on new external joints
- A long mastic snag list close to completion
Construction mastic across Portchester
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Why it’s worth doing now in Portchester
It helps to bring the mastic subcontractor in before the package is urgent. We can check joint widths, flag frames with gaps that won’t seal and confirm products against the specification, which avoids last-minute problems. Called in at the end, the same issues surface during handover. Over time, UV, weather and movement wear any sealant out. Renewing it in good time keeps the building weathertight.
Cost follows what’s involved: stripping out, preparation, sealing, access and phasing. Call for a fixed quote and we will explain how it’s made up.
What you get with us
- Standard and matched colours in many product ranges
- Clear, fixed quotes
- One contact handling all your sites
- Public liability insurance in place
Read our cost guide and how we’re accredited.
Construction mastic in Portchester, done properly
Mastic Doctor has been a subcontractor on construction projects for over 20 years. Quantities come off the drawings, the sequence is agreed with the site manager and the work follows the trades. To price a package in Portchester, send drawings and the specification through our quote form. If you have a mastic package split between trades with no clear owner and sealant knocked or painted over by other trades, we can help. Most enquiries from Portchester start with one failed joint and grow into a wider look at the building: we look at the rest while we’re there and tell you what we find.
Building work in places the size of Portchester is typically small-scale: a handful of new houses, barn conversions, a school or hall extension. Small schemes still need window perimeters, facade joints and internal sealant done to the specification.
What our 12-month guarantee covers is the way we did the job: the preparation, the sealing and the tooling. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Location
- Portchester (PO16, PO6, PO17)
- Wider area
- Hampshire
- Cover
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Questions about Portchester
Is Portchester off your patch?
Not at all. Portchester is within our area. We cover Greater London and the counties of the South East. Send photos and a list of what needs doing, and we will plan the job to need as few trips as possible.
Does a coastal location like Portchester affect which sealant is used?
It can. Coastal exposure works external joints harder than inland weather. We choose the product for the exposure, prime where the manufacturer requires it and size the joint for its movement.
What site paperwork can you supply?
Requirements differ from site to site, so tell us what you need and we will confirm it when we quote.
Can you work while the building is occupied?
In the majority of cases, yes. Phased work can be planned so areas stay in use.
Will you just go over the old sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.
Is any job too small?
We quote for single jobs as well as large packages and programmes. Send details for a fixed quote.
Will you stick to the specified products?
The specified product is what goes in. Any suggested alternative is put to you before anything changes.
Building and refurbishing in Portchester
Portchester is within about 1 mile of the coast. Coastal exposure means perimeter and cladding joints work harder than on an inland job, so we check the specified product suits the exposure before the first bead. Portchester has several hotels close by, all within 2 miles. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades.
University estates such as University of Portsmouth - North Zone, 3.2 miles to the south of Portchester, tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal. When a college such as St Vincent College, 2.8 miles south of Portchester, builds or refurbishes, the mastic package usually has to fit around students and staff. Hotels like Portsmouth Marriott Hotel (to the east of Portchester) rarely close for long, so refurbishment mastic is phased floor by floor.
Portchester is about 3 miles north-east of Gosport, in Hampshire. Portchester sits inside our coverage, with the same fixed quotes and 12-month guarantee as everywhere else. Across Hampshire, 723 places are covered, including Portchester.
We take on mastic packages across the PO16, PO6 and PO17 postcode area, for business premises of every kind. Among the streets we cover are Cow Lane, Hill Road and Ralph Road, and sites on any of them can send details for a fixed quote. Just outside Portchester, we also work in Boarhunt (2 miles north-west), Southwick (2 miles north), Elson (2 miles south-west), Wallington (2 miles west) and Priddy's Hard (2 miles south). A short drive away, we cover Gosport (3 miles south-west), Havant (6 miles east), Eastleigh (13 miles north-west), Fareham (3 miles west), Horndean (7 miles north-east) and Chandler's Ford (15 miles north-west).
Around Portchester
We work on buildings around Portchester Community School and The Cormorant pub. Portchester’s nearest station is Portchester station, roughly 0.5 miles north-west of the centre. Nearby you will also find Portchester Castle (less than half a mile south-east) and Queen Alexandra Hospital (2.3 miles east). Green spaces nearby include West of the River Alver and Portsdown Hill.
On site: what to expect
At the end of each section, the masking comes off, the area is cleaned and every joint is checked, ready for your sign-off. If an area should be left alone while the sealant cures, we say how long and put signs out. Several jobs near Portchester can be grouped on one trip. Mention the building’s opening times and we’ll work within them.
- We walk the site or review drawings to understand the package.
- You receive a fixed quote covering scope, products and sequence.
- Paperwork is agreed and applicators are inducted on site.
- Sealing follows the programme as areas are released.
- Problems we find, such as oversized gaps, are raised right away.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Getting the site ready
- Explain the parking and delivery arrangements
- Agree which areas must stay open
- Warn occupants and staff about the work
Get a fixed quote
Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we’ll return a fixed quote that you can work with. If you have questions first, give us a call on 01277 525 020 or email a schedule or drawings.
Related advice
Commercial clients in Portchester
Building owners and managing agents use us on everything from one building to a spread of sites. One quote can cover more than one site, which keeps the paperwork simple.
Hospitality, education, healthcare, office and retail clients come to us directly as well. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.
Should maintenance staff do it?
Redoing a failed joint typically costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
Using site staff can make sense for a small touch-up, but anything bigger is another matter: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
Cost factors for mastic packages
A fixed quote reflects the actual work. It allows for:
- Removal of failed or old sealant
- Joint width, depth and condition
- Access and working height
- Location, for remote and island sites
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.
Sending details for a quote
Whether it’s one area or a whole building, the same details help:
- Photos of the joints, close up and from further back
- Your programme or deadline
- What the building is and how it’s used
- Any specification or named product
A handful of photographs and a postcode is the fastest way to a quote. Send them through the quote form, or ring 01277 525 020 or use the quote form to discuss it first.
Aftercare for building managers
Cleaning and maintenance staff play a part too. Pass these on to them:
- Ask cleaners to use soft cloths around fresh sealant
- Get the mastic subcontractor involved early in the programme
- Don’t schedule sealing before decorators and flooring are done
- Plan external elevations with the weather in mind
Brief the sparkle clean so they don’t scrape the new joints. Blades and abrasive pads are the commonest cause of damage at the final clean.
Frames with gaps too wide for sealant need sorting before the mastic goes on. Sealant stretched over an oversized gap won’t last so packing or adjustment by the installer comes first. We flag them as soon as we see them.