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

Facade and window perimeter sealing in High Cross, West Sussex

Looking for facade sealing in High Cross? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.

  • Air leaks through failed facade joints
  • Leaks at window and door perimeters
  • Failed sealant on precast panel joints
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
Covering the South East & Scotland
Constructionline member
£5m PL insurance

Facade sealing near High Cross

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Facade sealing in High Cross, done properly

Most facade joint failures trace back to the joint, not just the sealant. The width has to suit the expected movement and the sealant’s movement capability, while rod fixes the depth and stops the bead sticking to the rear with the ratio the sealant maker recommends, often around 2:1. If you are dealing with water coming in around window frames and previous reseals run over old sealant, we can help. Facilities teams, main contractors and managing agents in High Cross tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.

For a site near High Cross, the mastic visit is planned so the right sealants, primers and backing rod are on hand. Drawings, photos and the programme let us give a fixed quote.

Guaranteed is the last step of every job. Our workmanship is backed for 12 months, and the quote explains what it covers.

Location
High Cross (BN6)
Region
West Sussex
Cover
A 12-month guarantee
Quote
Fixed quote, scope in writing
Call
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

High Cross: questions and answers

Is a smaller place like High Cross outside your area?

Not at all: smaller places are covered as well as towns. We cover Greater London and the counties of the South East. Where we can, we group nearby jobs to make the most of each trip.

Do you take on work at healthcare sites like The Dene Hospital?

Yes. We work in healthcare settings as well as offices and schools. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

Can staff carry on working while you are here?

In most cases, yes. We phase the work so most of the building stays in use, with each area protected and signed.

Do you guarantee your work?

Yes. The 12-month guarantee covers our preparation and application, though not damage or work by other trades.

How do I request a quote?

It works in four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. Step one needs little more than photos and a postcode.

Will you check whether the sealant is causing the leak?

Yes. Photos help, and you can ring 01277 525 020 or email drawings and photos to arrange a visit. Failed perimeter sealant is a common cause, but not the only one.

Which sealant will you use?

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.

Commercial clients in High Cross

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.

For main contractors, we work as the sealant subcontractor. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.

What we can’t put right

We check first that sealant really is the fix. It isn’t the answer for:

  • Water getting in through cracked render or porous masonry
  • Movement beyond what any sealant can handle
  • Arranging specialist high-level access, which is planned with the client

If you’re not sure, just give us a call on 01277 525 020 or email the details over and we’ll give you a straight answer.

Surfaces we seal

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

From enquiry to sign-off

At the end of each section, we remove the tape, clean down and inspect every joint, ready for your sign-off. Where the sealant needs time to cure before use, we tell you and sign the area. If others near High Cross need work, visits can be combined, which keeps travel down. You’ll have a fixed quote before work starts.

  1. We plan access and the order of elevations with the client.
  2. We only seal when joints are dry and within the product’s temperature range.
  3. We remove the old bead and check the edges are sound.
  4. Faces are cleaned, primed where needed and backed.
  5. Sealant is gunned in and tooled hard onto both faces.
  6. We hand over with our 12-month workmanship guarantee.

Preparing the site

  • Point out any areas we must not close
  • Let building users know which areas are affected
  • Send asbestos survey details if the building is pre-2000

Request a quote

Pricing a project or setting a maintenance budget? We will quote against your scope and drawings you can plan around. If you have questions first, speak to us on 01277 525 020 or email us.

Get a quick quote

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Quoting for work in High Cross

The price varies from site to site. Expect it to depend on:

  • Distance, for remote addresses
  • Phasing around occupants
  • The total length or number of joints
  • Removal of failed or old sealant

Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote and we’ll put a fixed figure on it.

Before you send an enquiry

There’s no need for a formal survey. A few details are enough to get going:

  • Rough lengths or quantities, or drawings if you have them
  • Whether the building will be occupied during the work
  • Clear photos of the problem areas
  • Any specification or named product

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.

Mastic packages on High Cross sites

Rainfall across the South East, High Cross included, is lower than in many parts of the UK. Even so, frost and condensation on steel and glass are common on winter mornings, so we time external mastic for dry faces and agree it with the site team. High Cross lies roughly 39 miles out from central London. 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.

New wings at hospitals like The Dene Hospital (2.9 miles north-east of High Cross) bring long runs of window and panel joints to seal. When a school such as Albourne CofE Primary School is extended or refurbished, the mastic package is often squeezed into the holidays.

High Cross is about 4 miles west of Burgess Hill, in West Sussex. Any commercial site in High Cross is covered, for single jobs and planned programmes alike. Our West Sussex coverage takes in 373 places, large and small. We also cover Brighton, some 9 miles away.

Business premises anywhere in BN6 are within our area. We also cover 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). A short drive away, we cover 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).

Local landmarks in High Cross

The nearest railway station is Hassocks station, about 3.4 miles east. Nearby you will also find The Dene Hospital (2.9 miles north-east) and Clayton Castle (3.9 miles south-east). Not far away are Wolstonbury Hill and Woods Mill.

Map of High Cross © OpenStreetMap contributors

Site staff or a sealant specialist?

General builders and handymen seal joints, but it isn’t their main trade. A specialist prepares properly, controls joint depth and picks a product with the right movement class, which is what makes a joint last.

There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and we will confirm the paperwork you need with the quote.

What we are called out for in High Cross

Sun, rain and temperature swings wear facade sealant down over the years. The bead hardens, chalks on the surface and loses the flexibility to follow the joint, then it splits or peels.

Most enquiries start with something like this:

  • Previous reseals run over old sealant
  • Draughts around frames and panels
  • Perimeter sealant that has split or peeled away
  • Gaps between rainscreen or cladding panels

Units on estates such as Valley Farm Business Park, 0.7 miles north-east of High Cross, tend to be reclad and refitted as tenants change, and each job leaves cladding and perimeter joints to seal.

Before you book anyone

  • Their plan for phasing and protecting the area
  • The terms of the workmanship guarantee
  • Their pre-qualification and accreditations
  • What site paperwork they can supply

Our contractor checklist

Accreditations

Trusted. Accredited. Insured.