Mastic sealing for building owners and managing agents in Southwick, Hampshire
Mastic sealing in Southwick, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Old repairs sealed over failed mastic
- Leaks at window and door perimeters
- No planned programme for sealant
Mastic sealing near Southwick
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Frames, entrances and external joints in Southwick
With the shore within about 2 miles, Southwick counts as a coastal location. Sea-facing elevations take driven rain and salt, and their mastic shows it before the sheltered sides do; plan inspections around that. Central London is about 62 miles from Southwick. Commuter-belt towns tend to have plenty of managed blocks near stations and town centres.
For a school such as King Richard School, perimeter mastic on windows and doors is a holiday job. If you are responsible for a building such as Church of St James Without the Priory Gate, frame and door mastic needs the same attention as any other property.
Southwick is about 3 miles west of Purbrook, in Hampshire. Our applicators travel to Southwick for work on mastic joints, handled exactly as we handle every other area. Across Hampshire, 723 places are covered, including Southwick.
We take on mastic joints across the PO17 postcode area, whatever the building. If your site is on High Street, North Road West and Castle Road or close by, we can quote for mastic joints. Close to Southwick, our area also takes in Boarhunt (1 mile west), North Boarhunt (2 miles north-west), Portchester (2 miles south), Hundred Acres (3 miles north-west) and North Fareham (3 miles west). Nearby towns on our patch include Gosport (5 miles south), Havant (5 miles east), Eastleigh (12 miles north-west), Fareham (4 miles west), Horndean (5 miles north-east) and Chandler's Ford (14 miles north-west).
Landmarks near Southwick
In Southwick, that means premises near Red Lion Inn. Southwick’s nearest station is Portchester station, about 1.9 miles south. Nearby you’ll also find Portchester Castle (2.6 miles south) and Fareham Shopping Centre (3.2 miles south-west). Open spaces near Southwick include Portsdown Hill and St Clair's Meadow.
About our mastic sealing in Southwick
Before work starts, most agents and landlords want the documents in order. Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We’re a Constructionline member and CHAS accredited, and we carry public liability insurance. We work on external wall and movement joints, shopfronts below residential blocks and communal entrances and stairwells, and the failures we are asked to look at most are estate-wide sealant that is simply worn out and water getting in round frames after rain. A single leaking joint is often how a building in Southwick first comes to us: we look at the rest while we are there and tell you what we find.
Owners and agents with buildings around smaller places such as Southwick tend to manage small terraces of association properties, converted barns and commercial units. Mastic around frames and on external joints wears out in time, whatever the building.
We stand by our work: 12 months, guaranteed. That covers our preparation and application.
- Where
- Southwick (PO17)
- Wider area
- Hampshire
- Cover
- 12 months on every job
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
When it isn’t the sealant
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Water coming in from the roof or rainwater goods
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
- Failed window or door frames, which need a window contractor
Not sure which it is? You can call 01277 525 020 or send photos by email and we’ll tell you honestly.
Joints and surfaces we work on
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Balcony and threshold joints
- Communal kitchens and washrooms
- Window and door perimeters on blocks
- External wall and movement joints
How a job runs
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Any old material is cut back to clean, sound faces, primer goes on where the manufacturer specifies it, and each bead is tooled to a neat concave finish. For work around Southwick, we aim to finish in one visit, so photos and measurements up front really help. Then the right materials arrive with us.
- We inspect each building and record the joints that have failed.
- The quote is fixed and split as suits you.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- New sealant goes in with backing rod and primer where needed.
- Each building is checked and signed off with the 12-month guarantee.
Preparing the site
- Send your site hours and access windows
- Make sure the joints can be reached
- Arrange parking or a loading space
Get a fixed quote
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, call the office on 01277 525 020 or email a schedule or drawings.
Related advice
Common problems we fix in Southwick
Topping up old mastic is a common shortcut. New sealant won’t grip failed sealant and the repair soon fails.
These are often picked up first by site or facilities staff:
- Estate-wide sealant that is simply worn out
- Damp patches beside frames
- Patchy repairs in mismatched sealant
- Damaged joints in communal entrances and corridors
Buildings close to stations like Portchester station (1.9 miles south of Southwick) are often flats over shops, with frame mastic to keep sound.
Questions to ask before you book
- Who will actually carry out the work
- Their plan for phasing and protecting the area
- Will RAMS and insurance details be available?
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
Nearby places to Southwick
What else we do in Southwick
When to bring in a specialist
General builders and handymen seal joints, but it isn’t their main trade. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.
Some joints are best left to specialists: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong normally costs more in the end than doing them right.
Quoting for work in Southwick
Quotes vary with the job. It mainly depends on:
- The size and state of each joint
- The total length or number of joints
- Site requirements such as inductions and permits
- Removal of failed or old sealant
Every site prices differently: joint size, product, access and site hours all play a part. Send the details and a fixed figure follows.
Sending details for a quote
A few photographs plus some basic facts will normally do. Please tell us:
- What the building is and how it’s used
- Rough lengths or quantities, or drawings if you have them
- How the joints are reached, and at what height
- A wide shot and a close-up of the area
We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To start the process, speak to us on 01277 525 020 or use the quote form.
Your questions answered
Can being near the sea in Southwick affect the sealant we need?
It can. Driven rain and salt are tougher on outside sealant than sheltered inland conditions. We check the specified product suits the exposure and pay close attention to preparation.
Will you take on work at estates like Castle Trading Estate, close to Southwick?
Yes. Estates, retail parks and business parks around Southwick, Castle Trading Estate among them, are all within reach. To start, just ring 01277 525 020 or use the quote form with the unit, the joints involved and your access times.
Does the weather affect the work?
It can, for external work. Sealant won’t bond properly to a wet or frosty joint, so external work may be moved if conditions aren’t right. Internal work is far less affected.
Is asbestos a concern with old mastic?
Asbestos removal isn’t part of our work. Anything suspect is tested before we carry on, and the duty to manage asbestos sits with the dutyholder.
Do you work in Southwick?
Yes. Southwick falls within our area, and you can call the office on 01277 525 020 or email us to get started.
Will residents or tenants be disturbed?
The work is planned around occupiers. We agree the programme so you can notify occupiers, and entrances stay in use.
When can the area be used after sealing?
We will confirm how long the chosen product needs to cure.
Owners, agents and contractors
CHAS accredited and a Constructionline member, we’re straightforward to vet for your supplier list. We’re fully insured, and our insurance certificate can go with the quote.
Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so the building keeps working while we do.