Construction and new-build mastic in Speed Gate, Kent
We carry out mastic packages for new-build and refurbishment projects in Speed Gate and the surrounding area. Send details for a fixed quote.
- External joints sealed in damp or cold conditions that are now failing
- A mastic package split between trades with no clear owner
- Oversized or tapered gaps around new frames
Construction mastic near Speed Gate
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Construction mastic in Speed Gate, done properly
On a new build, the mastic package is one of the last trades through each area. Mastic Doctor takes on mastic packages for main contractors and developers. We work on cladding and panel joints, window and door perimeters and sanitary and kitchen joints, and the usual reasons a site gets in touch are a mastic package split between trades with no clear owner and new external sealant already peeling away. A single leaking joint is often how a building in Speed Gate first comes to us: we look at the rest while we’re there and tell you what we find.
In the countryside around places like Speed Gate, conversion schemes put new frames into old stone, flint, brick or timber. A product that grips an irregular face, with a colour that suits the building’s character, is usually what’s needed.
Our workmanship is guaranteed for 12 months, in Speed Gate as everywhere else we work. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Location
- Speed Gate (DA3)
- Region
- Kent
- Guarantee
- A 12-month guarantee
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
What the job involves on each surface
Window and door perimeters
Perimeter joints between frames and the structure are the weather line on any new building. We use the specified perimeter sealant, typically a low-modulus neutral-cure silicone, with backing rod in deeper gaps.
Snagging before handover
The last pass before handover is where mastic snags are cleared. Snags are cleared room by room, cutting out damaged joints and resealing them properly.
Keeping the joints sound
Cleaning and maintenance staff play a part too. Pass these on to them:
- Keep product details for future maintenance
- Share drawings and the specification as soon as possible
- Bring the mastic contractor in after the last trades are through
- Plan external elevations with the weather in mind
The package carries our 12-month guarantee for workmanship. Damage by others isn’t a workmanship fault, so protecting sealed areas matters.
Sealing outside when the joint is damp or too cold leads to poor adhesion. Holding off until conditions suit avoids callbacks so external sequencing builds in some flexibility.
General trades versus a specialist
What you see is the finished bead, but most of the work is hidden. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong usually costs more in the end than doing them right.
How a job runs
The first thing on site is a walk round with your contact, agreeing which joints are in scope, where to start and what must stay open. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. Jobs in and around smaller places like Speed Gate are typically planned as a single visit, so photos and measurements up front really help. Then the right materials arrive with us.
- First we look at the scope on site or from drawings.
- You receive a fixed quote covering scope, products and sequence.
- Site paperwork is confirmed and our CSCS-carded applicators are inducted.
- Sealing follows the programme as areas are released.
- Problems we find, such as oversized gaps, are raised right away.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Getting the site ready
- Send asbestos survey details if the building is pre-2000
- Have the specification and drawings to hand
- Move anything stored against the joints
Quotes
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price the work to it. Smaller jobs need nothing more than photos and a few notes.
Read more
What sets the cost
These are the things that shape the price:
- How much existing material needs removing
- Whether the work must be split into stages
- The site’s rules and procedures
- Travel to remote or island sites
Larger quantities, tricky access or phasing all shape the price. Site requirements like inductions and permits play a part as well.
Details that help us quote
A few photos plus some basic facts will normally do. Please tell us:
- Anything awkward about access or site hours
- Photos of the joints, close up and from further back
- Any dates the work must fit around
- Where the site is, with the postcode
A handful of photos and a postcode is the fastest way to a quote. Upload them with the quote form, or phone 01277 525 020 or email drawings and photos if you’d rather talk the job through.
Contractors’ notes for Speed Gate
There are several hotels within about 2 miles of Speed Gate. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades. Speed Gate lies roughly 18 miles out from central London. Towns within reach of London tend to keep building, from flats to offices and schools, and main contractors there need mastic that keeps to the programme.
For contractors at a school such as Longfield Academy, sealing has to be finished before term starts. Building work at universities like University of Greenwich (4.9 miles north of Speed Gate) is often timed for the summer, mastic included.
Speed Gate is about 5 miles south of Dartford, in Kent. We cover commercial sites throughout Speed Gate. Speed Gate is one of 931 places in Kent on our list for mastic packages. For work in that direction, see our London page.
Postcode districts covered here: DA3 for mastic packages. Just outside Speed Gate, we also work in Fawkham Green (1 mile south-east), West Yoke (1 mile east), Ash (1 mile south-east), Maplescombe (2 miles south-west) and West Kingsdown (2 miles south). Further afield, our area takes in Maidstone (13 miles south-east), Dartford (5 miles north), Sevenoaks (7 miles south-west), Gravesend (6 miles north-east), Tonbridge (12 miles south) and Northfleet (5 miles north-east).
Near you in Speed Gate
Around Speed Gate, our work takes us to commercial buildings near The Rising Sun pub and the streets around them. The nearest railway station is Longfield station, about 2.3 miles north-east. Well-known places in the area include Darent Valley Hospital (4.5 miles north) and Eynsford Castle (2.4 miles west).
Towns and villages near Speed Gate
Other services in Speed Gate
Common questions from Speed Gate clients
Is Speed Gate off your patch?
Not at all: smaller places are covered as well as towns. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.
Do you take on work at healthcare sites like Darent Valley Hospital?
Yes, hospitals are one of the sectors we cover. We follow the site’s permits, sign-in and infection-control procedures in every area.
How long does a job like this take?
The duration is planned around your programme and the access we are given. We’ll give you an estimate of time on site when we quote.
Is the mastic package guaranteed?
It’s backed by our 12-month guarantee, covering how we sealed. Keeping other trades off finished joints prevents most problems.
What about RAMS and site documents?
Requirements differ from site to site, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.
What’s the quickest route to a quote?
You can use the quote form on this site; alternatively, ring 01277 525 020 or email us. Include photographs or drawings if you have them.
How much does the work cost?
Every job gets its own fixed quote. To get one, ring 01277 525 020 or email a schedule or drawings with a description of the work.
Do you need construction mastic in Speed Gate?
On construction sites, joints usually fail early because of when they were sealed, not what was used. Sealing before decorators, flooring or other trades have finished leaves joints exposed to damage.
Things that normally lead to an enquiry:
- External joints sealed in damp or cold conditions that are now failing
- Sanitary sealant damaged by following trades
- Mastic snags holding up handover
- Inconsistent sealant finishes from plot to plot
For a contractor working at a hospital such as Darent Valley Hospital, 4.5 miles north of Speed Gate, perimeter and facade sealing is planned around patients and deliveries.
What to look for in a quote
- Whether primer will be used where the manufacturer specifies it
- Whether their applicators hold CSCS cards
- Their pre-qualification and accreditations
- Their public liability cover