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

Commercial sealant contractors in Coldharbour, Kent

Sealant work for offices, shops, hotels and other commercial buildings in Coldharbour and across Kent. CHAS accredited and fully insured, with a 12-month guarantee.

  • Mouldy silicone around WCs, urinals and vanity tops
  • Earlier reseals applied straight onto the failed bead
  • Untidy joints in a reception, shop floor or lobby
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Signed off, with 12 months’ guarantee.
Covering the South East & Scotland
Constructionline member
Fully insured: £5m PL

Commercial sealant contractors for Coldharbour sites

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

Doing it in-house

What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.

General builders and handymen seal joints, but it isn’t their main trade. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.

Sealant applicators in Coldharbour

If you look after more than one building, a single sealant contractor saves a lot of chasing. Single jobs, multi-site packages and planned programmes all come to us, handled with the same process each time: send details, get a fixed quote, we seal, and a 12-month guarantee once it’s signed off. To get a programme moving in Coldharbour, ring 01277 525 020 or use the quote form with the site addresses. The enquiries we see most involve hardened, chalky sealant on south-facing or exposed elevations and wall and floor joints that have lost their seal, across floor and threshold joints, washrooms and tea points and kitchen worktops and splashbacks. Most enquiries from Coldharbour start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.

We price commercial jobs in Coldharbour from photos, drawings or a site visit, and the scope is set out in writing.

Business units in the countryside around places like Coldharbour are often converted barns, stables or farmyards. Old masonry beside new aluminium, timber and plasterboard gives plenty of joints between materials that move differently, and a sealant colour that suits the building’s character is often part of the brief.

Our 12-month guarantee is about workmanship, not wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we are clear about what is covered before work starts.

Where
Coldharbour (TN11)
Region
Kent
Cover
12 months on every job
Quote
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Different surfaces, different methods

Movement joints in walls and floors

Floor joints that take trolleys or forklifts need a tougher filler or sealant. We will recommend the right filler or sealant for the traffic and movement.

Facade and cladding joints

On a facade, a failed joint is often only visible close up. Photos from a closer viewpoint help us price.

Cost factors for sealant joints

What shapes the price:

  • Access and working height
  • Travel to remote or island sites
  • The size and state of each joint
  • How much there is to seal

The specified product makes a difference, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site requirements come into it too.

Sending details for a quote

A good diagnosis starts with the right details. Let us know:

  • Photos of the joints, close up and from further back
  • Where the site is, with the postcode
  • Whether an asbestos survey exists
  • Any specification or named product

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, phone 01277 525 020 or send photos by email.

Why deal with it now?

Some low prices are low because nothing gets cut out. Sealing over looks tidy at handover, then lifts once the joint starts moving. Our prices always include removal of the failed bead and full joint preparation. One visit to deal with every failing joint makes more sense than several trips to a place like Coldharbour. Photos of every joint help us quote for the whole job.

What a job costs comes down to the quantity of joints, how much old material needs removing and the access. Call for a quote once you have the details.

Why appoint us

  • Standard and matched colours in many product ranges
  • RAL and finish matching where the product range allows
  • Public liability insurance in place
  • Work carried out by CSCS-carded applicators

Take a look at what affects the cost or how we’re accredited.

Your questions answered

What paperwork can you provide for a job in Coldharbour?

We will confirm the paperwork you need, such as RAMS, our insurance certificate and CSCS details, with the quote. We hold £5m public liability insurance, are CHAS accredited and a Constructionline member, and our applicators are CSCS-carded.

Can the sealant on our Coldharbour premises match the finishes?

Yes. Colour matching to frames, cladding, stone and shop-fit finishes is a regular part of the work. Send colour references or photos and we will confirm what’s available for the product.

Does weather matter for sealant work?

It can, for external work. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so external work may be moved if conditions aren’t right. Indoors, the weather is rarely a problem.

How many days will you need on site?

The duration is planned around your programme and the access we are given. You will have an expected duration with the quote.

Will the building have to shut during the work?

That comes down to planning: we agree access windows, phase the work and keep enough facilities open. Tell us what has to stay open and we will plan the job around it.

Does commercial sealant work come with a guarantee?

It’s backed by our 12-month guarantee. Should anything we did fail within that period, let us know.

When is resealing likely to be due?

Nobody can honestly give a figure in years, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.

What Coldharbour’s businesses ask us to seal

Rainfall across the South East, Coldharbour included, is lower than in many parts of the UK. That helps, but frost and condensation on glass and coated frames still stop outside sealing on some winter mornings. At about 24 miles from central London, Coldharbour is within reach of the capital. This part of the South East is dense with business parks and out-of-town offices. Multi-site occupiers here often want one sealant contractor across all their buildings.

Shops and cafés around stations like Hildenborough station, 1.6 miles south-west of Coldharbour, trade from early, so work is timed around them. Whatever the building in Coldharbour, commercial sealant work starts with cutting out the failed bead and cleaning the joint back to sound material.

Coldharbour is about 2 miles north of Tonbridge, in Kent. Anywhere in TN11, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. Coldharbour is one of 931 places we cover in Kent for sealant joints. London is covered too, some 24 miles away.

We take on sealant joints across the TN11 postcode area, whatever the building. If your building is just outside Coldharbour, we cover Hildenborough (1 mile south-west), Hilden Park (1 mile south), Watt's Cross (1 mile west), Budds (1 mile north) and Stocks Green (2 miles south-west). Bigger towns within reach include Maidstone (12 miles east), Dartford (15 miles north), Sevenoaks (5 miles north-west), Royal Tunbridge Wells (6 miles south), Gravesend (15 miles north) and Northfleet (15 miles north).

Around Coldharbour

Locally, jobs take us to sites close to Hugh Christie Technology College and The Flying Dutchman Public House, among other places. The nearest railway station is Hildenborough station, roughly 1.6 miles south-west. Nearby you will also find Tonbridge Castle (2.2 miles south) and The Milne Museum (2 miles south). Open spaces near Coldharbour include Tudeley Woods RSPB reserve and Barden Lake.

Map of Coldharbour © OpenStreetMap contributors

On site: what to expect

In a busy building, the work is phased so only one area is out of use at a time. Each area is protected, prepared and sealed, then handed back before we move to the next. Smaller jobs around Coldharbour can be grouped with others nearby, which keeps travel down. A fixed quote is given before anything starts.

  1. Send details through our quote form, or ask for a site visit.
  2. We diagnose the cause of failure and price a fixed scope.
  3. Work is phased around your occupiers where areas need to stay in use.
  4. Every failed bead is removed rather than covered.
  5. A suitable product for each joint goes in at the right depth and is tooled.
  6. A final walk-round, then the 12-month guarantee applies.

Before we start on site

  • Move anything stored against the joints
  • Send asbestos survey details if the building is pre-2000
  • Agree which areas must stay open

Quotes

Photos, drawings or a schedule of the joints are often enough for a fixed quote. If the job needs a look first, we’ll arrange a site visit.

Get a quick quote

Advice

What we can’t put right

We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:

  • Broken glass or blown double-glazed units
  • Leaks from pipework, wastes or valves (that’s plumbing)
  • Walls or slabs moving more than any sealant can take

If you are not sure, just speak to us on 01277 525 020 or use the quote form and we’ll give you a straight answer before you book.

What we seal

  • Movement joints in walls and floors
  • Floor and threshold joints
  • Window and door perimeters
  • External facade joints
  • Kitchen worktops and splashbacks
  • Washrooms and tea points
Accreditations

Trusted. Accredited. Insured.