The Mastic Doctor team standing beside their branded vans outside an office building
Greater London · England

Facade and window perimeter sealing in West Kensington, Greater London

Facade joint and window perimeter sealing on commercial buildings in West Kensington. CHAS accredited and fully insured, with a 12-month guarantee.

  • Weathered facade joints that have lost their grip
  • Patch repairs that keep failing
  • Perimeter joints where frames meet the structure
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
Constructionline member
£5m public liability

Facade sealing across West Kensington

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Quoting for work in West Kensington

A fixed quote reflects the actual work. It allows for:

  • Removal of failed or old sealant
  • Induction, permit and paperwork requirements
  • Distance, for remote addresses
  • The product specified

Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.

Sending details for a quote

Good information means a firmer quote. Helpful details to send:

  • Clear photos of the problem areas
  • The site address and postcode
  • The asbestos register, for older buildings
  • Access details, including height

Send us photographs, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.

Facade sealing in West Kensington, done properly

We seal window and door perimeters, cladding panel joints, external facade joints and perimeter joints where frames meet the structure for clients around West Kensington. Coping and flashing joints are included where sealant is the specified fix. If you have leaks at window and door perimeters and hard, chalky sealant that no longer flexes, we can put it right. For commercial sealant work in West Kensington, you deal with one contact from quote to sign-off, whether it’s one building or several.

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.

Every job is signed off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.

Where
West Kensington (W14, SW6, SW5)
Region
Greater London
Cover
12 months on every job
Quote
Fixed quote, scope in writing
Phone
01277 525 020
Last updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Why it’s worth doing now in West Kensington

The longer a failed joint is left, the more the substrate suffers: edges get wet, render and timber deteriorate and frames can move. Acting at the first sign of splitting keeps the fix simple. In a London building, a failed joint rarely affects only one party. Putting it right early is less disruptive than dealing with the consequences.

The product called for affects the cost, and so does the preparation, such as cutting out, priming or new backing rod. Access, phasing and site requirements come into it too.

Why clients in West Kensington choose us

  • CHAS accredited contractor
  • Fixed quotes based on photographs, drawings or a visit
  • Commercial sealant work since 2005
  • 12-month guarantee on workmanship

See what affects the cost or how we’re accredited.

How a job runs

Before we leave any area, the masking comes off, the area is cleaned and every joint is checked. If an area should be left alone while the sealant cures, we say how long and put signs out. All of Greater London is in the ULEZ, and kerbside space in West Kensington can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.

  1. We look at the joints, the drawings and the access before pricing.
  2. The old bead is cut away completely, not overlaid.
  3. Both faces are cleaned and, where the product needs it, primed.
  4. Backing rod, or bond-breaker tape in shallow joints, limits the depth.
  5. The new sealant goes in and is tooled firmly onto both faces.
  6. The completed runs are checked with you, then the 12-month guarantee applies.

Before we start on site

  • Share the asbestos register for older buildings
  • Let us know about inductions and permits
  • Share your working hours and any access restrictions

Quotes

The quickest route to a quote is a few photos and the site postcode. Send them through the quote form, or call the office on 01277 525 020 or email drawings and photos to discuss it first.

Ask for a quote

Related advice

Building and refurbishing in West Kensington

Every borough of Greater London is inside the ULEZ, and that applies to contractors’ vehicles on any job in West Kensington. Deliveries are booked and storage is tight, so mastic materials come in as needed. West Kensington has plenty of hotels close by, all within 2 miles. Hotel extensions and refits usually have to fit around bookings, so mastic dates are tight.

For contractors on a campus like University of Westminster, which lies north of West Kensington, facade and perimeter sealing has to fit around students and term dates. Hospital estates such as Charing Cross Hospital, 0.6 miles south-west of West Kensington, 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.

West Kensington is about 1 mile south of Kensington, in Greater London. If you are looking for facade sealing in West Kensington, we can help, as we do across Greater London. Across Greater London, 764 places are covered, including West Kensington.

Commercial sites across W14, SW6 and SW5 are covered. For a building on Sun Road, Star Road and Field Road or nearby, we can quote for facade joints. Nearby places we also cover include North End (1 mile west), Brook Green (1 mile north-west), Fulham (1 mile south), Hammersmith (1 mile west) and Brackenbury Village (1 mile north-west) for facade joints. A short drive away, we cover London (5 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).

Local landmarks in West Kensington

Recent enquiries here include premises near Avonmore Primary School, Gwendwr Garden and Seven Stars pub, among other places. The nearest railway station is Kensington Olympia station, about 0.5 miles north of the centre. Well-known places in the area include Chelsea Stadium Tour And Museum (1 mile south-east) and Fulham Hospital (0.6 miles south-west). For a walk, there’s Campden Hill and The Long Water.

Map of West Kensington © OpenStreetMap contributors

Should maintenance staff do it?

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.

What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are easy to get wrong without experience.

When to call us in West Kensington

New sealant run over old sealant rarely holds. Fresh silicone won’t stick to cured silicone.

These are often picked up first by site or facilities staff:

  • Discoloured or dirty facade joints
  • New sealant peeling off old mastic
  • Failed sealant on precast panel joints
  • Facade joints cracked through the middle

When units on a site such as Berghem Mews Business Village, 0.7 miles to the north-west of West Kensington, are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.

Before you book anyone

  • How they handle RAMS and site documents
  • Whether primer will be used where the manufacturer specifies it
  • Their approach to joint depth and backing
  • Whether old or failed sealant will be cut out, not overlaid

How to choose a sealant contractor

What the job involves on each surface

Perimeter joints at frames and structure

Perimeter joints at frames often show their age first. They are cut out, cleaned, backed and resealed.

Precast concrete panels

Precast arrises sometimes crumble or carry old residue. We clean back to sound material and flag edges that need repair before sealing.

Your questions answered

Do you take on jobs in West Kensington where loading and access are tightly controlled?

Yes. Inductions, permits and timed loading are routine for us in London. Say when the building is occupied and when it’s quiet, and we’ll plan accordingly.

Can work at a site such as University of Westminster fit around teaching?

Yes, holiday working periods are the norm on campus jobs. Let us know which documents your site asks for, and we’ll confirm them alongside the quote.

What about RAMS and site documents?

Each site asks for different documents, so tell us what you need and we will confirm it when we quote.

Can staff carry on working while you’re here?

Usually, yes. Phased work can be planned so areas stay in use, with each area protected and signed.

Is it okay to overlay old mastic?

No. Fresh silicone won’t grip cured silicone, so the existing bead is removed entirely. That is what makes the new joint last.

What will the job cost?

There isn’t a price list, as every site differs. Send photos or drawings and we’ll price it at a fixed figure.

Do you work to architects’ specifications?

Yes. The specification and the manufacturer’s installation guidance are what we work to, and we raise anything unclear before work begins.

Accreditations

Trusted. Accredited. Insured.