Construction and new-build mastic in Kensington, Greater London
Construction mastic for Kensington, from a contractor working since 2005. Fully insured, with a 12-month guarantee.
- Sanitary sealant damaged by following trades
- Perimeter gaps outside the sealant’s range
- Missed perimeter joints on a new elevation
Construction mastic near Kensington
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Construction mastic in Kensington, done properly
Buyers, tenants and clients notice sealant lines long before they notice the structure. A smeared bead round a window or a gap behind a worktop ends up on the snag list and clearing them late eats into the handover window. Our aim is joints that pass at the first inspection, area by area through the programme. If you are dealing with mastic snags holding up handover and existing joints on a refurb that need cutting out and resealing, we can put it right, on floor and skirting junctions, window and door perimeters and brick and block movement joints alike. One point of contact handles commercial sealant work in Kensington from the first photos to the final walk-round, whether it’s one building or several.
Every London site, Kensington included, is inside the ULEZ, which applies to deliveries and contractors’ vans alike. Add booked delivery slots and limited storage, and a London mastic package needs planning before the first bead.
Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If our installation lets you down in that time, we return and fix it.
- Where
- Kensington (W11, W8, W14, SW7)
- Wider area
- Greater London
- Cover
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Commercial clients in Kensington
If you look after buildings for someone else, you need clear quotes and clear reporting. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative.
Blocks and communal areas make up much of the work for housing associations and agents. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.
Your questions answered
Do you cover business parks and estates near Kensington, such as Berghem Mews Business Village?
Yes. Estates, retail parks and business parks around Kensington, Berghem Mews Business Village among them, are all within reach. To start, just give us a call on 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
Can work at a site such as University of Westminster fit around teaching?
Yes. We plan campus work around teaching, exams and residence turnarounds. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Is it fine to apply new sealant on top of old?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Can you work to our specification?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and any queries are raised before we start.
Who decides which product is used?
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.
Do you take on mastic snagging only?
Yes. We clear snags by redoing joints rather than patching them.
Are you CHAS accredited?
Our applicators are CSCS-carded, and we hold CHAS accreditation and Constructionline membership. Tell us what site paperwork you need and we’ll confirm with the quote.
Towns and villages near Kensington
More services for Kensington
Why act early in Kensington
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 rather than at the snagging stage. Called in at the end, the same issues surface during handover. In Kensington, each extra visit means more notices, permits and disruption, so a proper job first time, with the old sealant fully removed, is worth it.
The price depends on how many linear metres there are, how much old material needs removing and how the joints are reached. Call for a fixed quote once you have the details.
Why clients in Kensington choose us
- Colours confirmed for the specified product
- Sealing commercial buildings since 2005
- Health and safety: CHAS accredited
- Fully insured, including public liability cover
Take a look at what affects the cost and our accreditations and insurance.
Should maintenance staff do it?
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Putting right a botched joint often costs more than sealing it well at the start, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
Signs you need construction mastic in Kensington
A joint without backing rod or bond-breaker often fails early. Bonded to the base of the joint and both sides, sealant can’t stretch evenly, so depth is controlled with backing rod or bond-breaker tape.
Most enquiries start with one or more of the following:
- Inconsistent sealant finishes from plot to plot
- Internal caulk splitting as the building dries out
- External joints sealed in damp or cold conditions that are now failing
- Existing joints on a refurb that need cutting out and resealing
Hotels like London Visitors Hotel, under half a mile south-west of Kensington, rarely close for long, so refurbishment mastic is phased floor by floor.
Questions to ask before you book
- What level of public liability insurance do they hold?
- How joint depth will be controlled
- Whether old or failed sealant will be cut out, not overlaid
- Whether primer will be used where the manufacturer specifies it
How a job runs
We begin with a short walk round with whoever looks after the building, 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. In Kensington, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- Drawings, specification and programme come to us.
- Quantities are measured and a fixed price returned.
- We agree with the site team which areas come first.
- Plots or floors are sealed as they’re handed over.
- Every joint is cleaned, set to depth and sealed with the specified product.
- After snagging, the work is handed over under our 12-month guarantee.
Before we start on site
- Tell us your opening times and when work is allowed
- Agree which areas must stay open
- Move anything stored against the joints
Ask for a quote
We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To start the process, call the office on 01277 525 020 or email the details over.
Related advice
How the job changes by surface
Bathrooms, en suites and washrooms
Across a block of flats or a hotel, sanitary sealing is repeated in every room. One applicator team gives the same finish everywhere, plot by plot or floor by floor.
Internal decorators’ caulk
Acrylic caulk fills internal gaps around trims, boards and frames ahead of decorating. It’s for gaps that stay still and get painted, and we use a flexible sealant where there’s movement.
New build and refits around Kensington
The area within 2 miles of Kensington holds plenty of hotels. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up. The ULEZ covers the whole of Greater London, Kensington included, so site vehicles need to meet its standards or pay the daily charge. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.
Recladding or extending a unit at a site like Berghem Mews Business Village, 0.7 miles to the west of Kensington, brings panel joints and frame perimeters into the programme. For a contractor working at a hospital such as Cromwell Hospital (0.6 miles south-east of Kensington), perimeter and facade sealing is planned around patients and deliveries.
Kensington is about 5 miles west of London, in Greater London. We send applicators to Kensington for mastic packages. Kensington is one of 764 places we cover in Greater London for mastic packages.
Work on mastic packages is covered throughout W11, W8, W14 and SW7. We cover commercial and managed buildings on Kensington High Street, Edwardes Square and Somerset Square and the roads nearby. With the A402 and B316 nearby, Kensington is easy to get to with materials and equipment. Nearby places we also cover include Holland Park (1 mile north), Notting Hill (1 mile north), Shepherd's Bush (1 mile west), Notting Dale (1 mile north) and White City (1 mile north-west). Further afield, our area takes in London (5 miles east), Marylebone (3 miles north-east), St Pancras (4 miles north-east), Shoreditch (6 miles east), Walthamstow (10 miles north-east) and Hoxton (6 miles north-east). As one of the bigger centres in Greater London, Kensington has a broad mix of commercial, public and industrial buildings.
Near you in Kensington
Recent enquiries here include premises near Holland Park, Scarsdale Tavern and Holland Park School and the streets around them. Also close by are Kensington School (0.5 miles east) and Abdus Salam Library (1 mile east). Kensington has its own railway station: Kensington Olympia station. Nearby you will also find Kensington Arcade (under half a mile east) and London Museum (0.7 miles north-east). The countryside around Kensington includes WWT London Wetland Centre and The Long Water.