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

Facade Sealing contractors in St Luke's

Need facade sealing in St Luke's? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.

  • Unsightly perimeter sealant on a visible elevation
  • Cladding panel joints that have opened up
  • Old perimeter mastic that has dried out
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
Covering the South East & Scotland
CHAS accredited
£5m PL insurance

Facade sealing across St Luke's

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Facade sealing for commercial buildings in St Luke's

Our facade sealing work covers external facade joints, window and door perimeters, cladding panel joints and the perimeter joints where frames meet the structure on offices, blocks and industrial units. Where sealant is the specified fix, we also take on coping and flashing joints. If you’re dealing with perimeter sealant that has split or peeled away and unsightly perimeter sealant on a visible elevation, we can put it right. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in St Luke's, preparation and product choice get the time they need.

Around St Luke's, as across London, much of the work is refurbishing existing buildings as well as building new ones. New frames, overcladding and fit-outs all end in perimeter and facade joints, frequently with occupants close by, so tidy, well-planned work matters.

The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.

Place
St Luke's (N1, EC1V, EC2A)
Wider area
Greater London
Guarantee
A 12-month guarantee
Price
Fixed quote, scope in writing
Telephone
01277 525 020
Last updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

When to call us in St Luke's

Product choice matters: an acetoxy cure can mark stone or corrode some metals, and interior products break down outdoors. Neutral-cure, facade-grade products are what most external joints need.

Clients normally get in touch after noticing something like this:

  • Draughts around frames and panels
  • Staining on stone next to old sealant
  • Weathered facade joints that have lost their grip
  • Failed sealant on precast panel joints

For contractors on a campus like The University of Law, which lies south-east of St Luke's, facade and perimeter sealing has to fit around students and term dates.

Before you book anyone

  • The terms of the workmanship guarantee
  • Will failed sealant be removed rather than covered?
  • Their plan for phasing and protecting the area
  • How joint depth will be controlled

Choosing a commercial sealant contractor

When to bring in a specialist

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.

Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and our CSCS-carded applicators are used to working under those rules.

Honest limits

Our job is the joint, not everything around it. On its own, sealant can’t deal with:

  • Joints too narrow for the movement they take, which need redesign
  • Specialist high-level access methods
  • Render or concrete edges that have broken away

If in doubt, give us a call on 01277 525 020 or email a schedule or drawings and we will say what we think.

Surfaces we seal

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

Questions we’re asked in St Luke's

Does your area include sites such as Southwark Bridge Business Centre, near St Luke's?

Yes, sites like Southwark Bridge Business Centre are within our area, along with the rest of St Luke's. Photos and a short description are enough for a first look.

Will you plan work around the academic year at somewhere like The University of Law?

Yes. Tell us the term dates, vacation periods and access windows, and we’ll plan the work around them. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Are you insured?

Yes. We are fully insured, including public liability cover.

How is access to upper-level joints handled?

That comes down to the access arranged for the job. When you call 01277 525 020 or email drawings and photos, describe the access, and we’ll plan the work with you.

How long will the new sealant last?

There isn’t a single answer, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.

Is colour matching possible?

It depends on the product specified. Some ranges offer many colours, others very few, so the available colours are confirmed with the quote.

Do we need an asbestos check before resealing?

In older non-domestic buildings, old sealant can contain asbestos. The dutyholder’s asbestos register should be checked first; if it’s suspected, work stops until it has been tested. Removal of asbestos isn’t something we do.

Our process

A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself normally takes anything from a single day to several weeks, depending on joint lengths, access and the weather, and we clear our waste as we work. All of Greater London is in the ULEZ, and kerbside space in St Luke's can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.

  1. First we review photographs, drawings or what we saw on a visit, and agree how each joint will be reached.
  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. A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
  6. The completed runs are checked with you, then the 12-month guarantee applies.

Preparing the site

  • For older buildings, check the asbestos register before work
  • Tell staff and tenants when we will be in
  • Point out parking and an unloading spot

Ask for a quote

A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we’ll fill any gaps with a visit.

Get a price

Read more

Mastic packages on St Luke's sites

St Luke's has a good number of hotels close by, all within 2 miles. When hotels extend or refit, the work is typically squeezed between peak periods, mastic included. As part of Greater London, St Luke's is inside the ULEZ, which applies to every van on site. Delivery slots and scarce storage shape how and when the mastic goes in.

For a contractor at a hotel such as Thistle City Barbican Hotel, less than half a mile to the north-west of St Luke's, the mastic often has to be finished before a reopening date. For contractors refurbishing units at places like Southwark Bridge Business Centre, 1.5 miles south of St Luke's, the mastic covers cladding panels, roller-door and window perimeters.

St Luke's is about 2 miles north of London, in Greater London. Anywhere in N1, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. We work across 764 places in Greater London, large and small.

Anyone looking for facade sealing in N1, EC1V and EC2A gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. For a building on Long Lane, City Road and Moor Lane or nearby, we can quote for facade joints. With the A1 and A501 nearby, St Luke's is straightforward for us to reach. If your building is just outside St Luke's, we cover Finsbury (1 mile south), Barbican Estate (1 mile south), Shoreditch (1 mile east), Hoxton (1 mile north-east) and City of London (1 mile south). Further afield, our area takes in City of Westminster (3 miles west), Kensington (5 miles west), Walthamstow (5 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west) and Brompton (4 miles south-west).

Around St Luke's

In St Luke's, that means premises near Barts Health Archives, Charterhouse Square School and The Masque Haunt pub and the streets around them. Nearby too are St Mary-at-Hill (1.1 miles south), Central Foundation Boys' School (less than half a mile east) and Artillery Ground (less than half a mile south-east). There’s a railway station in St Luke's itself: Old Street station. Well-known places in the area include Gabriel's Wharf (1.3 miles south-west) and Montfichet's Tower (0.9 miles south-west). For a walk, there’s St. James's Park Lake and Barnsbury Wood.

Map of St Luke's © OpenStreetMap contributors

Commercial clients in St Luke's

FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.

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.

Looking after the joints

Sealant joints are maintenance items, and their life depends on movement, exposure, cleaning and use. Our advice:

  • Avoid harsh cleaners on facade sealant
  • Investigate damp beside windows promptly
  • Note when each elevation was last resealed
  • Keep sills, gutters and drainage paths clear

Blocked sills and gutters push water at the joints. Sealant copes better when water runs off the facade as designed rather than sitting against the joints.

Deal with sections that fail early as soon as they show. Small repairs stop small leaks becoming large ones behind the facade.

Accreditations

Trusted. Accredited. Insured.