Expansion Joint Sealing in St Luke's
Sealant work in St Luke's for main contractors, managing agents and facilities managers: expansion and movement joint sealing in walls, decks and floors, quoted at a fixed price.
- Expansion joints split through the centre of the bead
- Brittle, chalky sealant on external joints
- Previous reseals laid over old sealant
Expansion joint sealing near St Luke's
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Expansion joint sealing for commercial buildings in St Luke's
Long runs of brick or block have movement joints built in that most people only notice when the sealant has gone. Once the seal fails, rain reaches the cavity and the joint can no longer close. The old seal is cut away, backing rod goes in at depth, and a low-modulus masonry sealant is gunned and tooled with primer where the maker calls for it. If you have hardened, cracked sealant on exposed facades and torn sealant in brick or block movement joints, we can help. Facilities teams, main contractors and managing agents in St Luke's tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Distribution and trade units on London’s edges, and deck car parks across the city, hold most of its floor and slab joints. Planning a job in St Luke's means thinking about access, loading times and the ULEZ as well as the joints.
We stand behind the joints we seal: 12 months, guaranteed. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.
- Place
- St Luke's (N1, EC1V, EC2A)
- Wider area
- Greater London
- Cover
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
When to bring in a specialist
For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.
Quoting for work in St Luke's
The price varies from site to site. Expect it to depend on:
- Distance, for remote addresses
- Any access equipment needed
- The total length or number of joints
- How much existing material needs removing
Access can matter as much as the joints themselves: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
What to include in your enquiry
There’s no need for a formal survey. A few details are enough to get going:
- The asbestos register, for older buildings
- Anything awkward about access or site hours
- Approximate linear metres or a joint schedule
- Where the site is, with the postcode
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price against exactly what is specified. For smaller jobs, photos and a description will do.
Places near St Luke's
More services for St Luke's
What we are called out for in St Luke's
Most movement joint failures come down to the joint stretching further than the sealant can take. A joint that’s too narrow for the movement, or a product with the wrong movement class, will split through the middle. Resealing like for like often fails the same way.
Most enquiries start with one or more of the following:
- Hardened, cracked sealant on exposed facades
- Joints packed with grit and debris
- Water getting into the wall through a failed joint
- Spalled or broken joint edges in floors and decks
University campuses such as The University of Law, under half a mile to the south-east of St Luke's, have car parks, paved walkways and building elevations with movement joints.
Comparing quotes
- Health and safety accreditation such as CHAS
- The named product and why it was chosen
- How they handle RAMS and site documents
- Their public liability cover
Owners, agents and contractors
We take on planned maintenance as well as one-off repairs: working through a building or an estate in stages that fit your budget. St Luke's can form part of a wider programme.
CHAS accredited and a Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
Traffic, movement and joints around St Luke's
Less than 3 miles from St Luke's there are at least three named estates and business parks. Their warehouses, yards and car parks are exactly where joints take the most punishment. In London, decks, bays and service yards normally have to keep running, so the work is broken into short sections agreed with the building manager.
Another example is Grand Vitesse Industrial Estate, 1.5 miles south of St Luke's, where floors and yards would be done in stages around the occupiers. Retail centres such as Brunswick Centre, 1.3 miles to the west of St Luke's, have floors, service yards and car parks with joints under constant traffic.
St Luke's is about 2 miles north of London, in Greater London. Any commercial site in St Luke's is covered. Across Greater London, 764 places are covered, including St Luke's.
If you need expansion joint sealing in N1, EC1V and EC2A, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. If your site is on Long Lane, City Road and Moor Lane or close by, send details and we will quote for movement joints. You’ll find St Luke's on or near the A1 and A501, so getting applicators and materials to site is simple. Close to St Luke's, our area also takes in 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). A short drive away, we cover 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
Around St Luke's, our work takes us to commercial buildings 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 (under half a mile east) and Artillery Ground (under half a mile south-east). St Luke's has its own railway station: Old Street station. Other landmarks nearby include Gabriel's Wharf (1.3 miles south-west) and Montfichet's Tower (0.9 miles south-west). The countryside around St Luke's includes St. James's Park Lake and Barnsbury Wood.
Diagnose, treat, sign off
Where the site stays busy, the work is phased so only one area is out of use at a time. Each section is protected, cleaned back and sealed, then handed back before the next one starts. All of Greater London is in the ULEZ, and kerbside space in St Luke's can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- Photos, joint lengths and drawings come to us, or we visit.
- Joint widths and expected movement are checked against what the sealant can take, and flag anything that needs an engineer.
- Old sealant and debris are cut out of every joint.
- Any broken arrises or friable edges are flagged before work goes further.
- The right sealant goes in at the right depth, bonded to the two sides only.
- Areas reopen once cured, and the work carries our 12-month guarantee.
Getting the site ready
- Move anything stored against the joints
- Send any specification or drawings in advance
- Point out any areas we must not close
Request a quote
Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, call the office on 01277 525 020 or email the details over.
Related advice
FAQs: St Luke's
Can you cope with the access rules in a London building?
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 will plan accordingly. The ULEZ covers the whole of Greater London, which we allow for
Would you work within a site like Moorfields Eye Hospital (City Road campus)?
Yes. Healthcare sites are among the places we work. Work is phased so departments keep running, under the site’s own rules.
What exactly is a movement joint?
Put simply, it’s a planned break in a wall, slab or deck so the materials can move. Many people call it an expansion joint and both need a flexible seal.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
When can the area be used after sealing?
We will confirm how long the chosen product needs to cure, and flag anything to keep off until it has cured.
Are your applicators CSCS-carded?
Yes. Should the site need card details in advance, let us know and we’ll send them with the quote.
Can you handle several sites?
Yes. A group of buildings can go on one quote, with one point of contact.
Keeping the joints sound
Every sealant joint needs some looking after, and how long they last depends on how they’re treated. We suggest:
- Include every elevation and deck joint in periodic inspections
- Act on the first tear or lifting edge rather than waiting
- Brief car park operatives to protect joint lines during winter clearance
- Reopen bays and walkways only after the stated cure time
Keep wheels, feet and water off new joints until the sealant has cured. How long that takes depends on the product, the temperature and the depth of the joint. Barriers left in place until then protect the finish.
Unsupported floor joint edges spall under forklift and pallet-truck wheels. Damaged edges make the floor rough and wear wheels faster. Keeping the filler or sealant sound protects the floor.