Construction and new-build mastic in Kennington, Greater London
Sealant work in Kennington for main contractors, managing agents and facilities managers: mastic packages for new-build and refurbishment projects, with a fixed quote first.
- External joints sealed in damp or cold conditions that are now failing
- Perimeter gaps outside the sealant’s range
- A long mastic snag list close to completion
Construction mastic near Kennington
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
About our construction mastic in Kennington
The specification and the programme set the job, not to habit. If a product is named, that’s what goes in. Joint widths, backing, primers and tooling follow the manufacturer’s guidance, so the joints perform as the designer intended. We work on cladding and panel joints, internal decorators’ caulk and floor and skirting junctions, and what we’re called in for most is external joints sealed in damp or cold conditions that are now failing and sanitary sealant damaged by following trades. Most enquiries from Kennington 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.
A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. New frames, overcladding and fit-outs all end in perimeter and facade joints, frequently with occupants close by.
What our 12-month guarantee covers is the way we did the job: preparation, application and finish. Damage, later alterations by others and movement beyond what the joint was designed for sit outside it.
- Location
- Kennington (SW8, SW1P, SE11)
- Region
- Greater London
- Guarantee
- 12 months on our workmanship
- Price
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Work for main contractors and building owners
Hotels, schools, healthcare sites, offices and retail units come to us directly as well. We plan around the way the building is used, so the building keeps working while we do.
Building owners and managing agents use us on sealant work across single buildings or whole portfolios. One quote can cover more than one site, which keeps the paperwork simple.
Do you need construction mastic in Kennington?
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, so they end up back on the snag list.
Any of the following is a good reason to get the joints checked over:
- Sealant knocked or painted over by other trades
- Frame perimeters left unsealed or poorly sealed
- Internal caulk splitting as the building dries out
- A long mastic snag list close to completion
Hospital estates such as Gordon Hospital, 1 mile to the north-west of Kennington, tend to grow and change in phases, often next to occupied wards, so facade and perimeter sealing has to fit the estates team’s plan.
Questions to ask before you book
- Their public liability cover
- Will RAMS and insurance details be available?
- The terms of the workmanship guarantee
- Will failed sealant be removed rather than covered?
Mastic packages on Kennington sites
Site traffic in Kennington falls within London’s ULEZ, like everywhere else in Greater London. Add booked deliveries and tight storage, and the mastic package needs planning with the site team. There are plenty of hotels within about 2 miles of Kennington. When hotels extend or refit, the work is typically squeezed between peak periods, mastic included.
For a contractor at a hotel such as Belgrave Hotel London (less than half a mile east of Kennington), the mastic often has to be finished before a reopening date. University estates such as University of the Arts London (to the west of Kennington) tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal.
Kennington is about 2 miles south-west of London, in Greater London. Businesses, contractors and managing agents in Kennington use us for work on mastic packages. Our Greater London coverage takes in 764 places, from busy centres to rural villages.
Anyone looking for construction mastic in SW8, SW1P and SE11 gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. We cover commercial and managed buildings on Kay Road, Lett Road and Rita Road and the roads nearby. Being close to the A203 and A3204, Kennington is straightforward for us to reach. If your building is just outside Kennington, we cover Oval (1 mile north), South Lambeth (1 mile south-west), Little Portugal (1 mile south), North Brixton (1 mile south-east) and Vauxhall (1 mile north). Bigger towns within reach include City of Westminster (3 miles north-west), Marylebone (3 miles north-west), Kensington (4 miles west), St Pancras (3 miles north), Shoreditch (4 miles north-east) and Walthamstow (8 miles north-east).
What’s near Kennington
Locally, jobs take us to sites close to St Peter's School, Archbishop Tenison's Church of England School and Lambeth Palace Library. Also close by are Crown and Thistle pub (under half a mile south-west) and Vauxhall Park (under half a mile north-west). There’s a railway station in Kennington itself: Vauxhall station. A little further out are Baynard's Castle (2.2 miles north) and Type Museum (0.5 miles south). Green spaces nearby include Bellenden Road Nature Garden and Ludgate Hill.
When it isn’t the sealant
Some faults sit outside our scope, and we say so rather than covering them up:
- Frames fitted out of tolerance
- Faulty frames rather than failed sealant
- Damage to finishes by other trades after we have sealed
Not sure which it is? You can call 01277 525 020 or send photos by email and we will tell you honestly before you book.
Where we work in Kennington
- Sanitary and kitchen joints
- Floor and skirting junctions
- Window and door perimeters
- Internal decorators’ caulk
- Cladding and panel joints
- Brick and block movement joints
Our process
A typical day starts with protection: tape along each joint edge and covers over finishes, stock and equipment close by. The work itself usually takes whatever the programme allows, since the work follows the trades as areas are released, and our waste is bagged and taken away as we go. In Kennington, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Areas are handed back as each section is finished.
- Drawings, the sealant specification and your programme come to us for pricing.
- A fixed quote sets out the scope, the products and the sequence.
- You tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we confirm it with the quote.
- We seal each plot or floor as it’s released to us.
- Every joint is prepared, set to depth and sealed with the specified product.
- Before handover, snags are dealt with and the package is signed off under our 12-month guarantee.
What we need from you
- Let building users know which areas are affected
- Share your working hours and any access restrictions
- Have the specification and drawings to hand
Get a fixed quote
The quickest route to a quote is a few photographs and the site postcode. Send them through the quote form, or ring 01277 525 020 or send details through our quote form if you’d rather talk the job through.
Advice
Towns and villages near Kennington
What else we do in Kennington
Questions we are asked in Kennington
Will you plan work around the academic year at somewhere like University of the Arts London?
Yes. We plan campus work around teaching, exams and residence turnarounds. We’re CHAS accredited and a Constructionline member, and paperwork such as RAMS is confirmed with the quote.
Can you cope with the access rules in a London building?
Yes, most London buildings have access rules of some kind, and we plan around them. The building manager’s rules go straight into our method. We allow for the ULEZ, which covers every borough
Which sealant will you use?
The specification comes first, if there is one. Without one, the joint decides: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
What will the job cost?
We don’t publish prices, as every site differs. Send photographs or drawings and we’ll price it at a fixed figure.
Can you follow the specification on our project?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and any queries are raised before we start.
Do you install fire-rated sealant as part of a package?
It can be part of the package where specified. Tell us what records you need and we will confirm with the quote.
What site paperwork can you supply?
Each site asks for different documents, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.
Looking after the joints
For the best life from the joints:
- Brief the final clean team to avoid blades near sealant
- Bring the mastic contractor in after the last trades are through
- Brief following trades on areas that have been sealed
- Ask for joint and product checks before the package is urgent
If a joint is damaged after sealing, flag it early. We can return to clear snags before handover as agreed in the quote.
One unsealed frame can let water into finished internal areas. That normally means redoing finishes in a completed area and possibly a delayed handover. Checking perimeters before internal finishes go on avoids it.
What sets the cost
Each job is priced on its own details. The things that drive the figure:
- Removal of failed or old sealant
- The size and state of each joint
- Any access equipment needed
- Location, for remote and island sites
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
What we need to price the job
There’s no need for a formal survey. These details are enough to start:
- How the joints are reached, and at what height
- Clear photographs of the problem areas
- Where the site is, with the postcode
- Whether an asbestos survey exists
Photos, drawings or a schedule of the joints are often enough for a fixed quote. Where a site visit makes more sense, we will arrange one.