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

Facade Sealing contractors in Horsham

Sealant work in Horsham for main contractors, managing agents and facilities managers: facade joint and window perimeter sealing on commercial buildings, with a fixed quote first.

  • Facade joints cracked through the middle
  • Failed sealant on precast panel joints
  • Failed seals around shopfront and entrance frames
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
London, the South East & Scotland
CHAS accredited
Fully insured: £5m PL

Facade sealing near Horsham

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

Aftercare for building managers

Problems stay small when the joints are checked regularly. Specifically:

  • Avoid patch repairs on failed facade joints
  • Keep pressure washers away from fresh sealant
  • Record the product and colour used on each elevation
  • Check the asbestos register before old mastic is disturbed

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

Tie resealing in with redecoration, cladding repairs or other access. Sharing the access keeps the cost down and cuts time on site.

Facade sealing in Horsham, 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. We work on shopfront frames, window and door perimeters and coping and flashing joints, and the usual reasons a site gets in touch are staining on stone next to old sealant and failed sealant on precast panel joints. A specialist sealant contractor works differently from a general builder: in Horsham, that means joint design, primers and backing rod as standard.

A large place such as Horsham normally has building going on somewhere: housing, schools, healthcare and commercial schemes. Mastic packages run from window perimeters and cladding joints to internal and sanitary sealant, all to the specification.

Every job is signed off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.

The Mastic Doctor team beside their liveried vans in front of an office building
Place
Horsham (RH12, RH13, RH20, BN44)
Region
West Sussex
Cover
12 months on our workmanship
Quotes
A fixed quote before we start
Telephone
01277 525 020
Updated
3 November 2026

Diagnose, treat, sign off

A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself typically takes a day or two for a few elevations, and longer where access has to be moved around the building, and our waste is bagged and taken away as we go. For premises in central Horsham, deliveries and parking need a bit of planning, while out-of-town estates normally have yards and car parks. Let us know what’s there when you send details.

  1. We look at the joints, the drawings and the access before pricing.
  2. Failed sealant is cut out along its full length.
  3. Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
  4. Closed-cell rod fixes the depth, and the sealant grips two sides only.
  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

  • Have the specification and drawings to hand
  • Tell staff and tenants when we’ll be in
  • Send your site hours and access windows

Ask for a quote

Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to speak to us on 01277 525 020 or email us with what you know.

Ask for a quote

Related advice

Commercial clients in Horsham

Building owners and managing agents use us on everything from one building to a spread of sites around Horsham. One quote can cover more than one site, which keeps the paperwork simple.

As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. We’re fully insured, and our insurance certificate can go with the quote.

Your questions answered

Will you plan work around the academic year at somewhere like The College of Richard Collyer?

Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. We are CHAS accredited and a Constructionline member, and paperwork such as RAMS is confirmed with the quote.

Is hospital work, at somewhere like Horsham Hospital, something you do?

Yes, provided the work is planned with the site’s estates team. The estates team’s permit system and infection-control rules come first, and the work is planned around them.

Is the work guaranteed?

Yes, for 12 months. If a joint fails because of how we installed it, we come back and put it right.

When can the area be used after sealing?

That comes down to the sealant and the temperature. Some products skin over quickly but need longer to cure fully, so we will confirm the curing time on the day.

Can the building stay open while you work?

Yes, with some planning. We agree a sequence with your contact so just one area at a time is disrupted.

How is access to upper-level joints handled?

Access is planned with you before we quote. Let us know what access is in place or planned, and the quote will reflect it.

Is Horsham in your area?

Yes. Sites across Horsham are covered, and the same phone number covers every area.

When it isn’t the sealant

Being straight saves everyone time. Fresh joints won’t solve:

  • Arranging specialist high-level access, which is planned with the client
  • Leaks from roofs, gutters or failed flashings rather than sealant joints
  • Replacing glass or failed glazing units

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

Joints and surfaces we work on

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

General trades versus a specialist

For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.

There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and our CSCS-carded applicators are used to working under those rules.

Do you need facade sealing in Horsham?

Sun, rain and temperature swings wear facade sealant down over the years. UV and weather harden the sealant until it can’t stretch with the building, and cracks or adhesion loss follow.

It’s worth sending us details if you spot any of the following:

  • Patch repairs that keep failing
  • Air leaks through failed facade joints
  • Cladding panel joints that have opened up
  • Staining on stone next to old sealant

For contractors at a college like The College of Richard Collyer, under half a mile to the north of Horsham, perimeters and internal sealant are timed for the holidays.

What your quote should include

  • How they handle RAMS and site documents
  • Health and safety accreditation such as CHAS
  • How they’ll work around occupants
  • Whether old or failed sealant will be cut out, not overlaid

Our contractor checklist

Facades, frames and programmes in Horsham

Horsham is about 31 miles from central London. Construction around the commuter belt mixes station-side flats with refurbished offices and units, so mastic packages have to keep pace with busy programmes. Horsham 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.

For a contractor working at a hospital such as Horsham Hospital (under half a mile north-west of Horsham), perimeter and facade sealing is planned around patients and deliveries. For a contractor at a hotel such as The King's Head Hotel, under half a mile to the south-west of Horsham, the mastic often has to be finished before a reopening date.

Horsham is about 31 miles south of London, in West Sussex. Any commercial site in Horsham is covered, whether it’s a single job or part of a planned programme. Across West Sussex, 373 places are covered, Horsham among them. We also cover Brighton, around 18 miles from Horsham.

Work on facade joints is covered throughout RH12, RH13, RH20 and BN44, for business premises of every kind. We cover commercial and managed buildings on Station Road, London Road and Market Square. With the A24 and A29 nearby, Horsham is easy to get to with materials and equipment. Close to Horsham, our area also takes in Tower Hill (1 mile south-west), Broadbridge Heath (2 miles west), Holbrook (2 miles north), Warnham (2 miles north-west) and Southwater (3 miles south). Further afield, our area takes in Crawley (7 miles north-east), Haywards Heath (11 miles south-east), Burgess Hill (11 miles south-east), East Grinstead (14 miles east), Broadfield (5 miles east) and Storrington (11 miles south-west). Among the larger centres in West Sussex is Horsham, and its commercial and public buildings are all within our area.

Local landmarks in Horsham

Locally, jobs take us to sites close to Millais School, Warnham Park and Kingslea Primary School and the streets around them. There’s a railway station in Horsham itself: Horsham station. Nearby you’ll also find Christs Hospital School Museum (2.4 miles south-west) and Horsham Hospital (less than half a mile north-west). Open spaces near Horsham include Warnham LNR.

Map of Horsham © OpenStreetMap contributors
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