Mastic contractors in Kemsing
Mastic packages for new-build and refurbishment projects in Kemsing and across Kent. CHAS accredited and fully insured, with a 12-month guarantee.
- Sanitary sealant damaged by following trades
- New external sealant already peeling away
- Different trades sealing to different standards
Construction mastic for businesses in Kemsing
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
When it isn’t the sealant
Sealant solves a lot, but not everything, and we’d rather tell you before you spend money. It won’t fix:
- Rework caused by others damaging completed areas
- Fire-stopping design or sign-off (that’s for the designer, fire engineer and building control)
- Frames fitted out of tolerance
Not sure which it is? You can speak to us on 01277 525 020 or email drawings and photos and we will tell you honestly.
Joints and surfaces we work on
- Brick and block movement joints
- Window and door perimeters
- Internal decorators’ caulk
- Sanitary and kitchen joints
- Cladding and panel joints
- Floor and skirting junctions
Construction mastic for commercial buildings in Kemsing
On a new build, the mastic package is one of the last trades through each area, so it lands at exactly the point the programme is tightest. Mastic Doctor takes on mastic packages for main contractors and developers with projects in Kemsing, sealing plot by plot or floor by floor as areas are released. The enquiries we see most involve external joints sealed in damp or cold conditions that are now failing and window and door perimeters that won’t pass inspection, on sanitary and kitchen joints, window and door perimeters and internal decorators’ caulk. Facilities teams, main contractors and managing agents in Kemsing tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.
Around places like Kemsing, a lot of construction is the conversion of older buildings, which leaves joints between old walls and new frames that need a sealant able to take the movement.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.
- Where
- Kemsing (TN15)
- Region
- Kent
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Leave it or put it right?
Getting the mastic contractor involved early pays off. We can check joint widths, flag frames with gaps that won’t seal and confirm products against the specification, which avoids last-minute problems. Leave it late and they turn up on the snag list. A failed joint lets water into a building whatever its size. Early resealing avoids the damage that follows a leak.
Access can matter as much as the joints themselves: joints within easy reach take less time than ones that need access equipment. Tell us how the joints are reached and call for a quote.
Why us?
- Public liability insurance in place
- One contact handling all your sites
- Workmanship guaranteed for 12 months
- Sealing commercial buildings since 2005
See what affects the cost and our accreditations.
Maintenance after handover
Regular inspection catches problems early. In particular:
- Bring the mastic contractor in after the last trades are through
- Put any product change through the designer first
- Ask cleaners to use soft cloths around fresh sealant
- Share drawings and the specification as soon as possible
Expect some settlement in the first months. The right product in each joint copes with that, but caulk in a joint that moves more than expected may crack. If that happens, let us know.
Snag items left to the last week put handover at risk. Clearing snags area by area spreads the work out and keeps handover on track.
Our process
Diagnose, treat, sign off: that’s the shape of every visit. First comes an inspection and agreement on scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. For a site in Kemsing, we plan so the whole job is done in one go where possible. Clear photographs and measurements help us bring the right products.
- Drawings, specification and programme come to us.
- We take off quantities and return a fixed quote.
- The sequence is agreed with the site manager.
- Each area is sealed when it’s released.
- Joints are prepared, backed and sealed to the specification.
- Snags are cleared and the package signed off with our 12-month guarantee.
Getting the site ready
- Explain the parking and delivery arrangements
- Send your site hours and access windows
- Tell us what induction or permit system the site runs
Get a fixed quote
Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, give us a call on 01277 525 020 or email a schedule or drawings.
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Towns and villages near Kemsing
More services for Kemsing
Contractors’ notes for Kemsing
Kemsing sits in one of the drier corners of the country, the South East. That doesn’t stop wet spells, or frosty starts that leave panels too damp to seal, which is why external dates are agreed with the site manager. At about 19 miles from central London, Kemsing is within reach of the capital. Towns within reach of London tend to keep building, from flats to offices and schools, and each scheme needs its mastic sealed to programme.
Historic houses such as Knole House (2.8 miles south of Kemsing) are a reminder of the older buildings in the wider area, where sealing against old stone, brick or timber needs compatible products. Recladding or extending a unit at a site like Goya Business Park Sevenoaks, 1.3 miles to the south-west of Kemsing, brings panel joints and frame perimeters into the programme.
Kemsing is about 2 miles north-east of Sevenoaks, in Kent. Commercial clients in Kemsing use us for work on mastic packages, as part of our coverage of Kent. We work across 931 places in Kent. Sites around London have their own page, roughly 19 miles from Kemsing.
Work on mastic packages is covered throughout TN15, whatever the building. We cover commercial and managed buildings on High Street, Copperfields Walk and Childsbridge Lane. Sites close to Kemsing are covered too, including Cotman's Ash (1 mile north-east), Heaverham (2 miles east), Woodlands (2 miles north-east), Romney Street (2 miles north) and Knatts Valley (2 miles north-east). A short drive away, we cover Maidstone (14 miles east), Dartford (9 miles north), Royal Tunbridge Wells (12 miles south), Gravesend (11 miles north-east), Tonbridge (8 miles south) and Northfleet (10 miles north-east).
Around Kemsing
Around Kemsing, our work takes us to commercial buildings near St Michael's Preparatory School, Knole Academy and Kemsing Down, among other places. The closest station to Kemsing is Otford station, about 1 mile north-west of the centre. A little further out are Kemsing Castle Bank (0.5 miles east) and Otford Heritage Centre (1 mile west). Open spaces near Kemsing include Dryhill Nature Reserve.
How the job changes by surface
Bathrooms, en suites and washrooms
Sanitary joints around baths, showers, basins and WCs need anti-mould sanitary silicone. Each joint is prepared, sealed and finished with a neat tooled line and baths are loaded where appropriate before sealing.
Internal decorators’ caulk
Acrylic caulk fills internal gaps around trims, boards and frames ahead of decorating. It’s paintable and suits gaps that don’t move, and we use a flexible sealant where there’s movement.
Your questions answered
Is a smaller place like Kemsing outside your area?
No. Small places get the same service as large ones. London and every South East county are within our area. Good photographs up front let us bring everything on the first visit.
Do you cover business parks and estates near Kemsing, such as Goya Business Park Sevenoaks?
Yes, sites like Goya Business Park Sevenoaks are within our area, along with the rest of Kemsing. Photos and a short description are enough for a first look.
How long do sealant joints last?
There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular inspection is the best way to catch problems early.
Can you send site paperwork?
Requirements differ from site to site, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.
Will you come and look before quoting?
That depends on the size and complexity of the job. Straightforward work can often be priced from photos and measurements, and bigger or more complex jobs usually get a visit.
Is colour matching possible?
That depends on the product specified. Some ranges offer many colours, others very few, so the available colours are confirmed with the quote.
What guarantee comes with a mastic package?
Each package is backed by a 12-month guarantee. We carry five million pounds of public liability insurance.
Common problems we fix in Kemsing
Wide, tapered or inconsistent gaps around frames are a common problem. Every product has limits on how wide a joint it can bridge, so gaps outside that range need sorting by the installer first. We flag them early rather than filling them with sealant that won’t last.
Common reasons buildings call us in:
- Sealant knocked or painted over by other trades
- Frame gaps too wide for sealant alone
- Window and door perimeters that won’t pass inspection
- Different trades sealing to different standards
New wings at hospitals like Sevenoaks Hospital, 1.6 miles to the south-west of Kemsing, bring long runs of window and panel joints to seal.
Before you book anyone
- Will RAMS and insurance details be available?
- Their public liability cover
- Will failed sealant be removed rather than covered?
- What the guarantee covers, and for how long