Greatness construction mastic
Work needed on a mastic package in Greatness? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Sanitary sealant damaged by following trades
- Oversized or tapered gaps around new frames
- External joints sealed in damp or cold conditions that are now failing
Need construction mastic in Greatness?
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Mastic packages on Greatness sites
Central London is about 19 miles from Greatness. Towns within reach of London tend to keep building, from flats to offices and schools, so mastic packages have to keep pace with busy programmes. Greatness 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, so external mastic is timed for workable conditions and agreed with the site manager.
Extensions at sites like Sevenoaks Hospital, less than half a mile to the south-west of Greatness, typically sit beside working departments, and the mastic follows strict access rules. New units and refits on sites such as Bat & Ball Enterprise Centre, under half a mile to the north-west of Greatness, need their panel and perimeter joints sealed to the specification. For contractors at a school such as St John's Church of England Primary School, sealing has to be finished before term starts.
Greatness is about 1 mile north-east of Sevenoaks, in Kent. Businesses, contractors and managing agents in Greatness can call on us for mastic packages, as part of our coverage of Kent. Greatness is one of 931 places we cover in Kent for mastic packages. Our London page has more on work in that area.
Work on mastic packages is covered throughout TN13, TN14 and TN15, whatever the building. For a building on Seal Road, Mill Lane and Sandy Lane or nearby, send details and we will quote for mastic packages. Close to Greatness, our area also takes in Seal (1 mile east), Godden Green (2 miles south-east), Styants Bottom (3 miles east), Bitchet Green (3 miles south-east) and Stone Street (3 miles south-east). Nearby towns on our patch include Maidstone (14 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (12 miles north-east), Tonbridge (7 miles south-east) and Northfleet (12 miles north-east).
What’s near Greatness
In Greatness, that means premises near The Old Bat and Ball pub, Wildernesse School and Knole Academy and the streets around them. Greatness has its own railway station: Bat & Ball station. Nearby you’ll also find Sevenoaks Museum (1.3 miles south) and Kemsing Castle Bank (1.7 miles north-east). Green spaces nearby include Dryhill Nature Reserve.
Construction mastic in Greatness
Mastic Doctor has been a subcontractor on construction projects for over 20 years. Quantities come off the drawings, the sequence is agreed with the site manager and the work follows the trades. For construction mastic on a scheme in Greatness, send drawings through our quote form, or phone or email us to talk it through. If you are dealing with missed perimeter joints on a new elevation and sealant knocked or painted over by other trades, we can help, on internal decorators’ caulk, window and door perimeters and sanitary and kitchen joints alike. A specialist sealant contractor works differently from a general builder: in Greatness, that means joint design, primers and backing rod as standard.
Conversions around smaller places like Greatness often join new frames to old masonry or timber, which leaves joints between old walls and new frames that need a sealant able to take the movement, in a colour the planners or architect are happy with.
Our 12-month guarantee is about workmanship, not wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we’re clear about what is covered before work starts.
- Where
- Greatness (TN13, TN14, TN15)
- Region
- Kent
- Guarantee
- 12 months on every job
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Questions we are asked in Greatness
Would you work within a site like Sevenoaks Hospital?
Yes, hospitals are one of the sectors we cover. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Is a smaller place like Greatness outside your area?
Not at all. Greatness is within our area. We work across Greater London and the South East. We plan jobs in smaller places so return trips are kept to a minimum.
Do you guarantee new-build sealant work?
It carries a 12-month guarantee on our workmanship. We’re also fully insured for public liability.
Do you do internal caulk as well as external mastic?
External and internal frame perimeters, caulking where it’s specified, sanitary silicone, kitchen joints and snagging before handover. We price to the specification and drawings.
Which sealant will you use?
A specification, where there is one, decides it. If there isn’t one, it comes down to the joint: its movement, its surfaces and what it has to cope with.
Does weather affect external mastic work?
External mastic depends on conditions: each sealant has a temperature range, and the joint must be dry. External work is sequenced with some flexibility.
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.
Diagnose, treat, sign off
In a busy building, the work is phased so only one area is out of use at a time. Each section is protected, cleaned back and sealed, then handed back before the next one starts. What matters most for a job in Greatness is a clear list of what needs doing. You will then get a fixed price for the work.
- First we look at the scope on site or from drawings.
- A fixed quote sets out scope, products and phasing.
- Site paperwork is confirmed and our CSCS-carded applicators are inducted.
- Sealing follows the programme as areas are released.
- Any frame gaps or issues outside our scope are flagged to the site team.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Preparing the site
- Let building users know which areas are affected
- Tell us which areas need to stay in use
- For older buildings, check the asbestos register before work
Ask for a quote
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To ask for one, give us a call on 01277 525 020 or email the details over.
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Also near Greatness
Other services in Greatness
Different surfaces, different methods
Snagging before handover
Snags normally come from damage by following trades, missed joints or poor earlier work. We price snagging as part of the package or as a separate visit, depending on what suits the programme.
Internal decorators’ caulk
Where the specification calls for it, acrylic decorators’ caulk goes on non-moving internal gaps before painting. It’s paintable and suits gaps that don’t move, and we use a flexible sealant where there’s movement.
For managing agents and facilities managers
We take on planned maintenance as well as one-off repairs: working through a building or an estate in stages that fit your budget. Greatness can form part of a wider programme across Kent.
Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, and each stage is agreed with your contact.
What affects the price in Greatness
We price every job individually. The things that drive the figure:
- Backing rod, priming and other preparation
- Location, for remote and island sites
- The total length or number of joints
- Which sealant the job calls for
No two sites price the same: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.
Sending details for a quote
There’s no need for a formal survey. A few details are enough to get going:
- Any specification or named product
- Rough lengths or quantities, or drawings if you have them
- Access details, including height
- Photos of the joints, close up and from further back
Need a figure for a tender or a budget? We will quote against your scope and drawings that you can work with. For a chat about it beforehand, speak to us on 01277 525 020 or email a schedule or drawings.
After the work
Once the work is signed off, these steps help:
- Brief the final clean team to avoid blades near sealant
- Keep product details for future maintenance
- Bring the mastic contractor in after the last trades are through
- Don’t force external sealing on a damp or frosty day
A new structure shifts as it loses construction moisture. Flexible sealants in the right joints handle normal movement. If that happens, let us know.
Oversized gaps are a problem better caught early. Sealant stretched over an oversized gap won’t last so packing or adjustment by the installer comes first. We flag them as soon as we see them.
Honest limits
We check first that sealant really is the fix. It won’t put right:
- Frame gaps too wide for sealant, which the installer needs to correct
- Deciding which fire-stopping product a penetration needs
- Specifying the product where the designer hasn’t
If you’re not sure, just call the office on 01277 525 020 or email the details over and we will give you a straight answer before you book.
Joints and surfaces we work on
- Sanitary and kitchen joints
- Internal decorators’ caulk
- Brick and block movement joints
- Window and door perimeters
- Cladding and panel joints
- Floor and skirting junctions