The Mastic Doctor team standing beside their branded vans outside an office building
Hampshire · England

Facade and window perimeter sealing in Hart Plain, Hampshire

Facade sealing in Hart Plain, backed by over 20 years in commercial sealing. Fully insured, with a 12-month guarantee.

  • Old perimeter mastic that has dried out
  • Damp patches beside frames after rain
  • Perimeter sealant that has split or peeled away
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
12-month guarantee on our workmanship.
South East, London & Scotland
Constructionline member
£5m public liability

Facade sealing in Hart Plain

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Facade sealing for commercial buildings in Hart Plain

We are often asked to look at water coming in around frames. Very often the perimeter bead has cracked or lost its grip. We will tell you if we think the leak is coming from somewhere sealant won’t fix. Most enquiries involve perimeter sealant that has split or peeled away and draughts around frames and panels, across window and door perimeters, perimeter joints where frames meet the structure and shopfront frames. A single leaking joint is often how a building in Hart Plain first comes to us: we look at the rest while we’re there and tell you what we find.

Around places like Hart Plain, a lot of construction is the conversion of older buildings, and the sealant at those junctions has to cope with two materials that move differently.

We stand by our work: 12 months, guaranteed. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
Hart Plain (PO8, PO7)
Wider area
Hampshire
Cover
A 12-month guarantee
Quotes
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026

Building owners, agents and FMs in Hart Plain

Hospitality, education, healthcare, office and retail clients come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.

If you look after buildings for someone else, clear figures and clear communication matter. You get a fixed quote, an agreed scope and a walk round at the end.

What we can’t put right

Part of a good diagnosis is knowing where sealant stops. We’ll tell you if the real problem is any of the following:

  • Render or concrete edges that have broken away
  • Water getting in through cracked render or porous masonry
  • Replacing glass or failed glazing units

Not sure which it is? You can give us a call on 01277 525 020 or send photos by email and we will tell you honestly before you book.

What we seal

  • Shopfront frames
  • Perimeter joints where frames meet the structure
  • Coping and flashing joints
  • Window and door perimeters
  • Cladding panel joints
  • Stone and brick facade joints

What the job involves on each surface

Coping and flashing joints

Not every coping or flashing leak is a sealant problem. We tell you if the fix is a roofing or metalwork job rather than a reseal.

Perimeter joints at frames and structure

These frame-to-structure joints take a lot of movement and weather. They are cut out, cleaned, backed and resealed using a sealant classified for that use.

Maintenance after handover

Once the work is signed off, these steps help:

  • Note when each elevation was last resealed
  • Combine resealing with other works that need access
  • Walk the elevations once or twice a year
  • Ask about asbestos in pre-2000 mastic

After heavy weather, check vulnerable elevations for signs of water inside. An early report normally means a small reseal rather than a bigger repair.

Get the joint design right when resealing: correct depth, proper backing and a sealant that can take the movement. Repeating a faulty detail just repeats the failure.

FAQs: Hart Plain

Is Dunsbury Hill Business Park, near Hart Plain, within your area?

Yes, sites like Dunsbury Hill Business Park are within our area, along with the rest of Hart Plain. Send details of the unit and the work through our quote form for a quick quote.

Is hospital work, at somewhere like Havant War Memorial Hospital, something you do?

Yes. Healthcare sites are among the places we work. Each area is agreed with the ward or department and the estates team in advance.

Is Hart Plain in your area?

Yes. Hart Plain is in our area and the rest of Hampshire, within our coverage of Greater London, South East England and Scotland. For a quote, call 01277 525 020 or email drawings and photos.

Does weather matter for sealant work?

For external joints, yes. Sealant needs a dry joint and a temperature within the product’s range, so damp, frosty or very cold days can stop external work. Inside work is seldom held up.

Can you find out why a window is leaking?

Yes. We check the sealant joints and report what we find before quoting. If the water seems to come from a roof, sill or the glazing unit instead, we say so.

Can one quote cover more than one building?

Yes. Several buildings can share a single quote, with one point of contact.

Can the sealant be colour-matched?

It depends on the product. Some ranges are wide, others limited, so the available colours are confirmed with the quote.

Facade sealing in Hart Plain: the local picture

Hart Plain sits in one of the drier corners of the country, the South East. Still, external mastic needs dry faces within the maker’s temperature limits, which isn’t every day, so we time external mastic for dry faces and agree it with the site team. Hart Plain is about 58 miles from central London. Building activity in the commuter belt runs from new flats near stations to business park refurbishments, which keeps mastic packages in demand.

Projects at schools like Hart Plain Infant School work to term dates, so mastic is programmed tightly. When units on a site such as Dunsbury Hill Business Park (1.7 miles south-east of Hart Plain) are refurbished or reclad, the panel joints and window perimeters are part of the mastic package. For a contractor working at a hospital such as Havant War Memorial Hospital, 3.5 miles to the south-east of Hart Plain, perimeter and facade sealing is planned around patients and deliveries.

Hart Plain is about 1 mile north of Waterlooville, in Hampshire. We cover commercial sites throughout Hart Plain, for single jobs and planned programmes alike. Across Hampshire, 723 places are covered, Hart Plain among them. We also cover Portsmouth, around 6 miles from Hart Plain.

Commercial sites across PO8 and PO7 are covered for facade joints. Among the streets we cover are Milton Road, King's Road and Eagle Avenue. Nearby places we also cover include Cowplain (1 mile north-east), Waterlooville (1 mile south), Soake (1 mile west), Furzeley Corner (2 miles west) and Purbrook (2 miles south) for facade joints. Further afield, our area takes in Gosport (8 miles south-west), Havant (3 miles south-east), Eastleigh (15 miles west), Fareham (8 miles south-west), Hedge End (12 miles west) and Petersfield (9 miles north-east).

Near you in Hart Plain

Recent enquiries here include premises near The Cowplain School. The closest station to Hart Plain is Rowlands Castle station, roughly 3.1 miles east of the centre. Nearby you will also find Havant Museum (3.9 miles south-east) and Clanfield Earthwork (4.1 miles north-east). For a walk, there’s Southmoor Nature Reserve and Windmill Hill.

Map of Hart Plain © OpenStreetMap contributors

Doing it in-house

Some joints are best left to specialists: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.

The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.

From enquiry to sign-off

Tell us your site hours and access windows and we’ll plan around them. While we’re working, the area stays contained and tidy, and we check in with your contact before moving on to each new area. What matters most for a job in Hart Plain is a clear list of what needs doing. A fixed quote follows.

  1. We look at the joints, the drawings and the access before pricing.
  2. Failed sealant is cut out along its full length.
  3. Both faces are cleaned and, where the product needs it, primed.
  4. Backing rod, or bond-breaker tape in shallow joints, limits the depth.
  5. The new sealant goes in and is tooled firmly onto both faces.
  6. We walk the finished joints with you before handing over.

Before we start on site

  • Warn occupants and staff about the work
  • Tell us what induction or permit system the site runs
  • Tell us which areas need to stay in use

Ask for a quote

A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we’ll fill any gaps with a visit.

Get a price

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