Construction and new-build mastic in High Cross, West Sussex
Construction mastic in High Cross, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Caulk cracking where joints are moving more than expected
- Oversized or tapered gaps around new frames
- Sealant knocked or painted over by other trades
Construction mastic across High Cross
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
How we handle construction mastic in High Cross
Mastic tends to be one of the final packages before handover, so it lands at exactly the point the programme is tightest. We work as a mastic subcontractor to main contractors and developers with projects in High Cross. Site teams most often ask us about perimeter gaps outside the sealant’s range and cracks opening in caulked internal joints, on cladding and panel joints, window and door perimeters and brick and block movement joints. For commercial sealant work in High Cross, you deal with one contact from quote to sign-off, whether it’s one building or several.
Sites around smaller places like High Cross can be a fair drive from suppliers, so we come with everything the package needs, timed to the stage the job has reached. Send drawings or photographs and the programme and we will quote to suit.
Our 12-month guarantee is about workmanship, not wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we are clear about what is covered before work starts.
- Place
- High Cross (BN6)
- Region
- West Sussex
- Guarantee
- A 12-month guarantee
- Quotes
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Different surfaces, different methods
External facade and movement joints
Many facade substrates need a primer before sealing. We prime where the manufacturer specifies, and seal only with a dry joint inside the product’s temperature range.
Fire-rated sealant where specified
Where the specification calls for fire-rated or intumescent sealant around service penetrations or linear gaps, we install it to the manufacturer’s tested detail. Fire stopping design belongs to the designer and building control.
Commercial clients in High Cross
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.
As a CHAS accredited contractor and Constructionline member, we’re straightforward to vet for your supplier list. Our insurance certificate can be sent along with the quote.
On site: what to expect
Site rules come first: signing in, inductions and any permit to work. Once we’re cleared to begin, we take the joints in the sequence agreed with you, and each area is checked before we leave it. For a building around High Cross, tell us how to find it and who will meet us. Add it to your enquiry and we’ll build it into the plan.
- Drawings, specification and programme come to us.
- Quantities are measured and a fixed price returned.
- The sequence is agreed with the site manager.
- Plots or floors are sealed as they’re handed over.
- Joints are prepared, backed and sealed to the specification.
- After snagging, the work is handed over under our 12-month guarantee.
Getting the site ready
- Send any specification or drawings in advance
- Let us know about inductions and permits
- Send asbestos survey details if the building is pre-2000
Request a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price the work to it. For smaller jobs, photographs and a description will do.
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Keeping the joints sound
A few simple habits keep the new joints working:
- Brief following trades on areas that have been sealed
- Ask installers to correct oversized gaps first
- Ask for joint and product checks before the package is urgent
- Brief the final clean team to avoid blades near sealant
Our 12-month guarantee covers the workmanship from sign-off. The guarantee covers how we sealed, not later damage by other trades.
In wet areas, a weak sanitary joint shows up quickly once the building is occupied. Leaks behind showers and basins damage finishes and floors. Proper preparation, with the right silicone first time, keeps it off the defects list.
Quoting for work in High Cross
We price every job individually. The main factors are:
- Working within restricted access windows
- Joint width, depth and condition
- Whether old sealant has to be cut out first
- Induction, permit and paperwork requirements
The price depends on the quantity of joints, what has to come out first and how the joints are reached. Call for a quote once you have the details.
Before you send an enquiry
To price the job accurately, we need a clear picture of the site. Send us:
- The postcode of the building
- The type of building and who uses it
- When you need the work done
- Anything awkward about access or site hours
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To ask for one, speak to us on 01277 525 020 or send details through our quote form.
New build and refits around High Cross
High Cross is in the South East, one of the UK’s drier regions. Winter mornings still bring frost and condensation on frames and panels, so external mastic is timed for workable conditions and agreed with the site manager. Central London is about 39 miles from High Cross. Commuter-belt towns tend to see a steady flow of new flats, offices and commercial schemes, and main contractors there need mastic that keeps to the programme.
For a contractor working at a hospital such as The Dene Hospital, which lies north-east of High Cross, perimeter and facade sealing is planned around patients and deliveries. Recladding or extending a unit at a site like Valley Farm Business Park (0.7 miles north-east of High Cross) brings panel joints and frame perimeters into the programme.
High Cross is about 4 miles west of Burgess Hill, in West Sussex. We cover commercial sites throughout High Cross, whether it’s a single job or part of a planned programme. High Cross is one of 373 places we cover in West Sussex. Brighton is covered too, some 9 miles away.
Postcode districts covered here: BN6 for mastic packages. Just outside High Cross, we also work in Albourne (1 mile south-east), Albourne Green (1 mile south-east), Albourne Street (1 mile south-east), Blackstone (1 mile south-west) and Twineham (2 miles north). Bigger towns within reach include Crawley (12 miles north), Horsham (10 miles north-west), Worthing (11 miles south-west), Haywards Heath (7 miles north-east), Burgess Hill (4 miles east) and Shoreham-by-Sea (8 miles south).
What’s near High Cross
The nearest railway station is Hassocks station, roughly 3.4 miles east of the centre. Nearby you’ll also find The Dene Hospital (2.9 miles north-east) and Clayton Castle (3.9 miles south-east). Green spaces nearby include Wolstonbury Hill and Woods Mill.
Questions about High Cross
Is Valley Farm Business Park, near High Cross, within your area?
Yes. Our area takes in High Cross and its surroundings, with estates and business parks such as Valley Farm Business Park included. A few photographs and the unit address let us price the work.
Is hospital work, at somewhere like The Dene Hospital, something you do?
Yes, healthcare and care buildings are part of our work. Each area is agreed with the ward or department and the estates team in advance.
Can you work to our specification?
Yes. Send it with your enquiry, and the quote will be based on it.
Who decides which product is used?
If the job is specified, we follow the specification. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
Can you work to our specification?
The specification decides the product and flag anything that doesn’t look right for the joint. Specifications often reference BS EN 15651 or BS 6213.
Will you just go over the old sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Do you have public liability insurance?
Yes. Mastic Doctor is fully insured, public liability included.
Also near High Cross
Other services in High Cross
What we’re called out for in High Cross
Shrinkage and settlement in the first months put new joints under strain. Materials lose construction moisture and shrink and internal caulk in a moving joint is usually the first to crack. Choosing the right product for each joint reduces that.
Things that usually lead to an enquiry:
- Bath and shower joints scraped during the final clean
- Different trades sealing to different standards
- Existing joints on a refurb that need cutting out and resealing
- Mastic snags holding up handover
School extensions, at buildings such as Albourne CofE Primary School, typically run to the summer holidays, mastic included.
Questions to ask before you book
- How they’ll work around occupants
- Will CSCS-carded applicators be on site?
- Their public liability cover
- Health and safety accreditation such as CHAS