Construction and new-build mastic in Southwick, Hampshire
We carry out mastic packages for new-build and refurbishment projects in Southwick and the surrounding area. Send details for a fixed quote.
- Oversized or tapered gaps around new frames
- Early adhesion failures on new external joints
- A long mastic snag list close to completion
Construction mastic across Southwick
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Construction mastic for commercial buildings in Southwick
Mastic is often where a new building first shows its quality to the client. Untidy or missed joints are among the commonest snag items and clearing them late eats into the handover window. We seal so the snag list stays short, area by area through the programme. Most enquiries involve mastic snags holding up handover and external joints sealed in damp or cold conditions that are now failing, across cladding and panel joints, floor and skirting junctions and window and door perimeters. Whoever orders the work in Southwick, the brief is usually the same: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Around smaller places like Southwick, building work typically means conversions of farm buildings, a few new houses or an extension to a hall or school. Perimeters, facade joints and internal sealant all need doing properly, however small the scheme.
A 12-month guarantee applies to all our work. Should something we installed fail, speak to us on 01277 525 020 or email the details over and we’ll come back to it.
- Location
- Southwick (PO17)
- Region
- Hampshire
- Guarantee
- 12 months on every job
- Quotes
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Commercial clients in Southwick
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.
We work for building owners and managing agents on sealant work across single buildings or whole portfolios. One quote can cover more than one site, which keeps the paperwork simple.
How a job runs
Inspect, seal, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. Smaller jobs around Southwick can be grouped with others nearby. You’ll have a fixed quote before work starts.
- We price from the drawings, specification and programme you send.
- You receive a fixed quote listing scope, products and phasing.
- You tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we confirm it with the quote.
- We seal each plot or floor as it’s released to us.
- Every joint is prepared, set to depth and sealed with the specified product.
- Snags are cleared before handover and completed areas carry our 12-month guarantee.
Preparing the site
- Move anything stored against the joints
- Explain the parking and delivery arrangements
- Send asbestos survey details if the building is pre-2000
Request a quote
Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price the work to it. Smaller jobs need nothing more than photographs and a few notes.
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How the quote is worked out
We price every job individually. The main factors are:
- Working within restricted access windows
- Access and working height
- Backing rod, priming and other preparation
- The site’s rules and procedures
Pricing mastic packages depends on quantities, condition and access, and any specification that applies. Ask us for a fixed quote.
Sending details for a quote
Good information means a firmer quote. When you get in touch, include:
- How the joints are reached, and at what height
- Approximate linear metres or a joint schedule
- Where the site is, with the postcode
- Your programme or deadline
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to phone 01277 525 020 or send details through our quote form with what you know.
Nearby places to Southwick
What else we do in Southwick
Signs you need construction mastic in Southwick
Most mastic snags on new buildings come from sequencing rather than product. If sealant goes in before the last trades are through, it gets knocked, painted over or contaminated, and the joint has to be redone.
Most enquiries start with one or more of the following:
- Oversized or tapered gaps around new frames
- External joints sealed in damp or cold conditions that are now failing
- Cracks opening in caulked internal joints
- Failed sealant in an existing building being refurbished
Units on estates such as Castle Trading Estate (to the south of Southwick) tend to be reclad and refitted as tenants change, and each job leaves cladding and perimeter joints to seal.
Comparing quotes
- The named product and why it was chosen
- Proof of insurance
- Will CSCS-carded applicators be on site?
- Whether old or failed sealant will be cut out, not overlaid
Mastic packages on Southwick sites
Southwick is within about 2 miles of the coast. Coastal exposure means perimeter and cladding joints work harder than on an inland job, so joint design, primers and product choice deserve extra care. Rainfall across the South East, Southwick included, is lower than in many parts of the UK. 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.
For a contractor working at a hospital such as Queen Alexandra Hospital (2.5 miles south-east of Southwick), perimeter and facade sealing is planned around patients and deliveries. Projects at schools like King Richard School work to term dates, so mastic is programmed tightly.
Southwick is about 3 miles west of Purbrook, in Hampshire. If you’re looking for construction mastic in Southwick, we can help. Southwick is one of 723 places we cover in Hampshire for mastic packages.
Postcode districts covered here: PO17 for mastic packages. For a building on High Street, North Road West and Castle Road or nearby, send details and we’ll quote for mastic packages. If your building is just outside Southwick, we cover 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).
What’s near Southwick
Around Southwick, our work takes us to commercial buildings near Red Lion Inn, among other places. Southwick’s nearest station is Portchester station, roughly 1.9 miles south of the centre. A little further out are Portchester Castle (2.6 miles south) and Fareham Shopping Centre (3.2 miles south-west). Not far away are Portsdown Hill and St Clair's Meadow.
Your questions answered
Can being near the sea in Southwick affect the sealant we need?
It can. Wind-driven rain and, closer to the shore, salt air are harder on external joints. That puts more weight on product choice, primers where the manufacturer specifies them, and correct joint sizing.
Can you take on a job at a hospital such as Queen Alexandra Hospital?
Yes. Healthcare sites are among the places we work. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
How do you work with the site programme?
We follow the trades through the building. Areas are sealed as they’re released by the site team.
Do you work in Southwick?
Yes. We cover Southwick and the rest of Hampshire, within our coverage of Greater London, South East England and Scotland. To discuss a job, call the office on 01277 525 020 or email us.
How long before the joints can be used?
We’ll confirm how long the chosen product needs to cure, and sign any area that should be left alone.
Do you offer coloured sealant?
That depends on the product. Some ranges offer many colours, others very few, so we’ll confirm the colours available for the specified product with the quote.
What accreditations do you hold?
Our applicators hold CSCS cards, and we’re CHAS accredited and a Constructionline member. Public liability insurance of five million pounds is in place too.
Honest limits
Before quoting, we check that sealant is the right answer. It won’t put right:
- Specifying the product where the designer hasn’t
- Rework caused by others damaging completed areas
- Faulty frames rather than failed sealant
If you are not sure, just call 01277 525 020 or use the quote form and we’ll give you a straight answer.
What we seal
- Cladding and panel joints
- Window and door perimeters
- Internal decorators’ caulk
- Brick and block movement joints
- Floor and skirting junctions
- Sanitary and kitchen joints
Aftercare for building managers
After handover, a little attention goes a long way:
- Brief following trades on areas that have been sealed
- Use the product the specification names
- Check frame gaps are within the sealant’s range before sealing
- Ask for joint and product checks before the package is urgent
A new structure shifts as it loses construction moisture. Flexible sealants in the right joints handle normal movement while rigid fillers and caulk can crack where movement is larger. If that happens, let us know.
External joints sealed in poor weather are a common cause of early failure. Waiting for a dry joint and the right temperature is better than redoing work so external sequencing builds in some flexibility.