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

Facade Sealing in Chelsea Harbour

Planning work on a facade joint in Chelsea Harbour? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Leaks at window and door perimeters
  • Failed seals around shopfront and entrance frames
  • New sealant peeling off old mastic
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
London, the South East & Scotland
CHAS accredited
Fully insured: £5m PL

Facade sealing in Chelsea Harbour

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

Leave it or put it right?

Resealing a few window perimeters is a small job; repairing water-damaged interiors and fixings is not. Water through a failed joint rarely stays where it starts, so the real damage is often some distance away. Repeat call-outs disrupt occupied London buildings, so a proper job first time, with the old sealant fully removed, is worth it.

The product called for affects the cost, and so does the preparation, from cutting out to priming and backing rod. Access, phasing and site rules also count.

Why us?

  • A range of standard colours, depending on the product
  • Commercial sealant work since 2005
  • Health and safety: CHAS accredited
  • Fully insured

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

How we handle facade sealing in Chelsea Harbour

We seal window and door perimeters, cladding panel joints, external facade joints and perimeter joints where frames meet the structure on commercial buildings in Chelsea Harbour. Coping and flashing joints are included where sealant is the specified fix. The enquiries we see most involve new sealant peeling off old mastic and draughts around frames and panels, across coping and flashing joints, cladding panel joints and shopfront frames. Whether you call it commercial sealant work, mastic application or joint sealing, the work in Chelsea Harbour is the same: the right product in a properly prepared joint.

Construction in a London area such as Chelsea Harbour means working on constrained sites: limited storage, booked deliveries and access shared with other trades. Mastic is normally one of the last trades on each elevation or floor, so we keep to the programme and the order of trades the site sets.

The 12-month guarantee is for workmanship rather than 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.

Location
Chelsea Harbour (SW6, SW11, SW10)
Wider area
Greater London
Cover
A 12-month guarantee
Price
Quoted before any work starts
Call
01277 525 020
Updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Signs you need facade sealing in Chelsea Harbour

Sometimes the substrate is the problem: crumbling render, spalling concrete or flaking paint take the sealant with them. When the joint edges need repair first, we say so.

Common reasons buildings call us in:

  • Failed seals around shopfront and entrance frames
  • Cladding panel joints that have opened up
  • Discoloured or dirty facade joints
  • Water coming in around window frames

New wings at hospitals like Chelsea and Westminster Hospital, 0.6 miles north of Chelsea Harbour, bring long runs of window and panel joints to seal.

Before you book anyone

  • How they’ll work around occupants
  • What the guarantee covers, and for how long
  • How they handle RAMS and site documents
  • Their public liability cover

How to choose a sealant contractor

When it isn’t the sealant

Not every problem is a sealant problem, and we are upfront when that’s the case. These need a different solution:

  • Replacing glass or failed glazing units
  • Leaks from roofs, gutters or failed flashings rather than sealant joints
  • Cracked or spalling substrates that need repair before sealing

Not sure which it is? You can call the office on 01277 525 020 or email a schedule or drawings and we will tell you honestly.

Joints and surfaces we work on

  • Coping and flashing joints
  • Window and door perimeters
  • Perimeter joints where frames meet the structure
  • Stone and brick facade joints
  • Cladding panel joints
  • Shopfront frames

Your questions answered

Could you schedule work at a campus like Royal College of Art for the vacation?

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.

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. Say when the building is occupied and when it’s quiet, and we will plan accordingly.

Do you run new sealant over the existing bead?

No. New sealant won’t hold on old sealant, so the old bead is cut away and the joint cleaned back to sound material. That is what makes the new joint last.

Is colour matching possible?

It depends on the product. Some ranges are wide, others limited, so the available colours are confirmed with the quote.

Do you cover Chelsea Harbour?

Yes. We take on work across Chelsea Harbour.

How long does a job like this take?

We plan the time on site around your programme and access. You will have an expected duration with the quote.

What do you charge?

We don’t publish prices, as every site differs. With photographs or drawings, we can give you a fixed quote.

Our process

Occupied buildings need a little choreography. The work area is signed and kept contained, with routes through the building left open and move on in phases so staff and visitors can carry on around us. For a job in Chelsea Harbour, access comes first: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Give us the hours we can be on site and we’ll schedule to suit.

  1. First we review photographs, drawings or what we saw on a visit, and agree how each joint will be reached.
  2. Failed sealant is cut out along its full length.
  3. Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
  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.

Getting the site ready

  • Move anything stored against the joints
  • Point out any areas we must not close
  • Point out parking and an unloading spot

Getting a fixed quote

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 send details through our quote form if you’d rather talk the job through.

Ask for a quote

Related advice

New build and refits around Chelsea Harbour

The area within 2 miles of Chelsea Harbour holds plenty of hotels. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades. As part of Greater London, Chelsea Harbour is inside the ULEZ, which applies to every van on site. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.

Hotel extensions and refits, at places such as Chelsea Harbour Hotel (less than half a mile north-west of Chelsea Harbour), normally run between busy periods, so the sealing is squeezed into short windows. University estates such as Royal College of Art, 0.6 miles to the north-east of Chelsea Harbour, tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal.

Chelsea Harbour is about 2 miles south-east of Kensington, in Greater London. Our applicators travel to Chelsea Harbour for work on facade joints. Chelsea Harbour is one of 764 places we cover in Greater London for facade joints.

If you need facade sealing in SW6, SW11 and SW10, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Among the streets we cover are Ann Lane, York Road and Lots Road, and sites on any of them can send details for a fixed quote. Sites close to Chelsea Harbour are covered too, including Sands End (1 mile south), Walham Green (1 mile north-west), World's End (1 mile north), Little Chelsea (1 mile north) and Parsons Green (1 mile west). Bigger towns within reach include London (4 miles north-east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (4 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).

Landmarks near Chelsea Harbour

Around Chelsea Harbour, our work takes us to commercial buildings near Heatherley School of Fine Art, Lots Road pub and Imperial Park and the streets around them. Also close by are Langford Primary School (less than half a mile south-west) and Natural History Museum Library and Archives (1.5 miles north). There’s a railway station in Chelsea Harbour itself: Imperial Wharf station. A little further out are Baynard's Castle (4.3 miles north-east) and Chelsea Stadium Tour And Museum (0.6 miles north-west). Green spaces nearby include WWT London Wetland Centre and Battersea Park Lake.

Map of Chelsea Harbour © OpenStreetMap contributors

Quoting for work in Chelsea Harbour

We price every job individually. The things that drive the figure:

  • Working within restricted access windows
  • Induction, permit and paperwork requirements
  • The total length or number of joints
  • Any access equipment needed

We don’t publish prices, because the scope varies so much from one building to the next. For a fixed figure, call for a quote and we’ll price your job on its own details.

Details that help us quote

Diagnosis starts before we arrive. Let us know:

  • Access details, including height
  • The postcode of the building
  • The asbestos register, for older buildings
  • Approximate linear metres or a joint schedule

We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To ask for one, call the office on 01277 525 020 or email the details over.

Looking after the joints

Once the work is signed off, a little attention goes a long way:

  • Share access with other external trades
  • Clear debris that holds water against joints
  • Never let anyone seal over old sealant
  • Ask about asbestos in pre-2000 mastic

Hold back any cleaning crew until the joints have had their stated cure time. Pressure washers and harsh cleaners can damage a fresh bead and tell your cleaning contractor.

Coordinate facade sealing with other external works. Sharing the access keeps the cost down and cuts time on site.

Accreditations

Trusted. Accredited. Insured.