Mastic sealing for building owners and managing agents in Horsham, West Sussex
Planning work on a mastic joint in Horsham? We look at it, seal it with the right product and hand it over with a 12-month guarantee.
- Mastic failing across several blocks on an estate
- Failed external movement joints
- Window mastic that has split and shrunk
Mastic sealing in Horsham
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
About our mastic sealing in Horsham
For over 20 years we have resealed joints for owners, agents and landlords. Our applicators are CSCS-carded and we hold public liability insurance. Each building we complete carries a 12-month guarantee on our workmanship. We work on communal kitchens and washrooms, shopfronts below residential blocks and external wall and movement joints, and the usual reasons a site gets in touch are mastic failing across several blocks on an estate and no planned programme for sealant. Searching for sealant specialists in Horsham? We’ve been sealing commercial buildings since 2005, with CSCS-carded applicators.
A large place such as Horsham normally has blocks of flats, housing association estates and commercial buildings with mixed ownership. A planned programme lets failed mastic be renewed block by block across an estate.
The 12-month guarantee is for workmanship rather than 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.
- Location
- Horsham (RH12, RH13, RH20, BN44)
- Region
- West Sussex
- Cover
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Updated
- 3 November 2026
After the work
Once the work is signed off, a little attention goes a long way:
- Look at the sunniest and most exposed elevations first
- Encourage occupiers to report problems at frames
- Avoid piecemeal callouts where you can
- Make mastic part of routine maintenance checks
If paintable sealant was used, decoration can follow once it has cured. Silicone typically can’t be painted, so keep decorators off it unless told otherwise.
Joints on a building age together so a single failure is a sign to check the rest. Doing them together saves going back again and again.
What sets the cost
Before we quote, we look at:
- Joint width, depth and condition
- Distance, for remote addresses
- Any access equipment needed
- Phasing around occupants
Access often affects the price as much as the sealing: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.
Sending details for a quote
We can often quote from photographs and a few details. Please tell us:
- Whether an asbestos survey exists
- Clear photos of the problem areas
- How the joints are reached, and at what height
- The type of building and who uses it
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, ring 01277 525 020 or email the details over.
From enquiry to sign-off
On arrival, we sign in, go through any site induction and check how permits are handled. Everything around the joints gets protected before anything is cut or cleaned, with the work itself typically taking a day or two for a single block, longer for an estate programme. In a large town like Horsham, work on busy buildings is planned area by area, so the building keeps working. Send drawings or photographs and we’ll set out a phasing plan with the quote.
- 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.
- Old mastic is removed and the joint 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.
Getting the site ready
- Agree which areas must stay open
- Warn occupants and staff about the work
- Make sure the joints can be reached
Get a fixed quote
To get a fixed quote, speak to us on 01277 525 020 or email drawings and photos with the site address and an outline of the work. You can also send details through our quote form.
Related advice
Why deal with it now?
Leaving failed external joints lets water reach the structure behind. Damp patches, stained plaster and decorating claims can follow, which is harder to deal with than resealing. Water getting in through a failed joint can damage finishes, stock and fittings, and putting that right normally costs more than the reseal. It pays to act early.
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you will have a fixed figure to work with.
Why clients in Horsham choose us
- Fixed quotes based on photographs, drawings or a visit
- Our applicators hold CSCS cards
- Fully insured
- A Constructionline member, so easy to vet
Take a look at how commercial sealant jobs are priced or how we’re accredited.
Honest limits
Not every problem is a sealant problem, and we’re upfront when that’s the case. These need a different solution:
- Roof leaks, gutters or failed flashings that aren’t sealant joints
- Broken glass or failed sealed units
- Asbestos-containing sealant, which we don’t remove
If in doubt, speak to us on 01277 525 020 or email the details over and we will say what we think before you book.
Joints and surfaces we work on
- Shopfronts below residential blocks
- Communal kitchens and washrooms
- Window and door perimeters on blocks
- Balcony and threshold joints
- Communal entrances and stairwells
- External wall and movement joints
What the job involves on each surface
Commercial and mixed-use buildings
Where retail and residential share a building the programme has to suit everyone. Tell us your site hours and access windows and we will plan around them.
Tenement and older buildings
Traditional buildings have joints that need a careful approach. The material either side of the joint shapes the product choice.
Nearby places to Horsham
What else we do in Horsham
Looking after buildings in and around Horsham
Horsham sits in one of the drier corners of the country, the South East. External mastic still waits for dry faces and the right temperature, while the elevations that take the most sun tend to show hardened mastic first. There are eight care or nursing homes within about 2 miles of Horsham. Care home owners need frame and external mastic kept sound without unsettling residents.
For owners of several units at places like Nightingale Trading Estate, under half a mile to the north-east of Horsham, one programme can deal with frame and external mastic across the lot. Blocks of flats and mixed-use buildings often cluster around stations such as Horsham station (to the east of Horsham) and their window and balcony mastic tends to age at the same rate across a building. Older community buildings, Hope Chapel among them, often have frames of mixed ages whose mastic varies.
Horsham is about 31 miles south of London, in West Sussex. Anywhere in RH12, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. We work across 373 places in West Sussex, from busy centres to rural villages. For work in that direction, see our Brighton page, about 18 miles away.
We cover the RH12, RH13, RH20 and BN44 postcode districts. Among the streets we cover are Station Road, London Road and Market Square, and sites on any of them can send details for a fixed quote. Main routes into Horsham include the A24 and A29. 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). Nearby towns on our patch include 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 we take on mastic joints for its commercial and public buildings.
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. Other landmarks nearby include Christs Hospital School Museum (2.4 miles south-west) and Horsham Hospital (under half a mile north-west). For a walk, there’s Warnham LNR.
FAQs: Horsham
Is Nightingale Trading Estate, near Horsham, within your area?
Yes. We cover Horsham and the area around it, including industrial estates, business parks and retail parks such as Nightingale Trading Estate. To start, just speak to us on 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
Do you work in occupied care homes around Horsham?
Yes. We work around residents’ routines, a room or two at a time. Noise and disruption are kept to a minimum.
What if the old mastic contains asbestos?
Some mastics in pre-2000 buildings contain asbestos. We ask for the asbestos register or survey before work starts and suspect material is tested first.
Does the weather affect the work?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so external work may be moved if conditions aren’t right. Indoors, the weather is rarely a problem.
What paperwork can you provide?
Our credentials include CHAS, Constructionline and public liability insurance. Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote.
What guarantee do you give on resealing?
Every building we reseal has a 12-month guarantee. It applies to our workmanship rather than damage or problems with the frames.
Can you quote from photographs?
That depends on the size and complexity of the job. Straightforward work can often be priced from photographs and measurements, and bigger or more complex jobs typically get a visit.