Mastic sealing for building owners and managing agents in Clerkenwell, Greater London
Mastic sealing in Clerkenwell, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Worn sealant at communal door frames
- Mastic failing across several blocks on an estate
- Window mastic that has split and shrunk
Need mastic sealing in Clerkenwell?
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
About our mastic sealing in Clerkenwell
On a residential block, the work happens around people’s lives. The sequence, the areas and the dates are settled with you so you can let residents know what is happening. Entrances and stairwells are kept in use throughout. If you’re dealing with a mix of products and colours from past repairs and no planned programme for sealant, we can help, on window and door perimeters on blocks, communal entrances and stairwells and external wall and movement joints alike. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in Clerkenwell is the same: the right product in a properly prepared joint.
In a London area such as Clerkenwell, many buildings are blocks of flats or mixed-use buildings run by managing agents, landlords or housing associations. Mastic around windows, doors and balconies tends to fail across a whole block at a similar time, which is why block-wide programmes make sense.
We stand by our work: 12 months, guaranteed. That covers our preparation and application, and if something we did falls short, we return to it.
- Location
- Clerkenwell (N1, EC1V, WC1X)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Quote
- A fixed quote before we start
- Call
- 01277 525 020
- Page updated
- 3 November 2026
Planned mastic for Clerkenwell portfolios
In London, mastic work on a block goes through the managing agent or landlord, with notice to residents. We plan around the notices and access you arrange. Clerkenwell has two care or nursing homes no more than 2 miles away. For owners and operators of care buildings, window perimeters and external joints are best renewed in planned phases around residents.
For a school such as St Peter and St Paul RC Primary School, perimeter mastic on windows and doors is a holiday job. Landlords with units on estates such as Roman Way Industrial Estate, 1.3 miles to the north of Clerkenwell, can bring frame, door and external mastic across several units into one programme.
Clerkenwell is about 2 miles north of London, in Greater London. Businesses, contractors and managing agents in Clerkenwell use us for work on mastic joints, as part of our coverage of Greater London. Across Greater London, 764 places are covered, Clerkenwell among them.
We take on mastic joints across the N1, EC1V and WC1X postcode area, whatever the building. For a building on Long Lane, City Road and Noel Road or nearby, we can quote for mastic joints. With the A1 and A5201 nearby, Clerkenwell is straightforward for us to reach. Sites close to Clerkenwell are covered too, including Farringdon (1 mile south), Angel (1 mile north), Smithfield (1 mile south), Holborn (1 mile south-west) and St Pancras (1 mile west). Nearby towns on our patch include Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south).
What’s near Clerkenwell
Around Clerkenwell, our work takes us to commercial buildings near Barts Health Archives, The Sekforde pub and Elizabeth Garrett Anderson School. You’ll also find Tech City College (less than half a mile north-east) and King Square Gardens (under half a mile north-east). There’s a railway station in Clerkenwell itself: Farringdon station. Other landmarks nearby include Brunswick Centre (0.9 miles west) and Montfichet's Tower (0.9 miles south). Open spaces near Clerkenwell include St. James's Park Lake and Ludgate Hill.
Towns and villages near Clerkenwell
What else we do in Clerkenwell
How the job changes by surface
External movement joints
Movement joints are cleaned out, backed with rod and resealed with a sealant of the right movement class.
Planned maintenance
Planned resealing replaces emergency callouts and keeps budgets predictable.
Do you need mastic sealing in Clerkenwell?
Poor preparation explains many failed joints. Where the faces weren’t cleaned or primed as specified, the bead peels off one side.
Clients typically get in touch after noticing one or more of the following:
- Damaged joints in communal entrances and corridors
- Complaints coming in block by block
- Open joints in brickwork or panels
- Damp patches beside frames
Trustees of buildings like St James's Church can bring frame and external mastic into a planned maintenance list.
Before you book anyone
- The named product and why it was chosen
- Will RAMS and insurance details be available?
- Whether primer will be used where the manufacturer specifies it
- Whether their applicators hold CSCS cards
Cost factors for mastic joints
Sealant work doesn’t have a standard rate, since sites vary so much. What we look at:
- Distance, for remote addresses
- The size and state of each joint
- Whether old sealant has to be cut out first
- The site’s rules and procedures
We don’t publish prices, since every building and every scope is different. For a fixed figure, call for a quote.
Sending details for a quote
For an accurate fixed quote, we need a clear picture of the site. Useful things to include:
- Drawings or a marked-up plan, if available
- Clear photos of the problem areas
- The product your specification calls for
- Access details, including height
Quotes are fixed against the scope you send, so the cost is agreed before work starts. To start the process, phone 01277 525 020 or email the details over.
Site staff or a sealant specialist?
For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are easy to get wrong without experience.
Work for main contractors and building owners
CHAS accredited and a Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
We work for building owners and managing agents on sealant work across single buildings or whole portfolios. One quote can cover more than one site, so there’s one set of paperwork to deal with.
From enquiry to sign-off
We follow your site rules from the start: signing in, inductions and any permit to work. Once we are cleared to begin, the joints are worked through in the order agreed with your site contact. Most London premises stay occupied while we’re on site, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- We inspect each building and record the joints that have failed.
- You get a fixed quote, per block or for the whole programme.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- New sealant goes in with backing rod and primer where needed.
- We check the finished work and confirm the guarantee.
What we need from you
- Let us know about inductions and permits
- Share the asbestos register for older buildings
- Send your site hours and access windows
Get a fixed quote
To get a fixed quote, call the office on 01277 525 020 or use the quote form, telling us the site location and the nature of the job. You can also send details through our quote form.
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Your questions answered
Can you work at a site such as Roman Way Industrial Estate, by Clerkenwell?
Yes. We cover Clerkenwell and the area around it, including industrial estates, business parks and retail parks such as Roman Way Industrial Estate. A few photographs and the unit address let us price the work.
Do you work for managing agents with blocks near Farringdon station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. Photos of each elevation help us quote accurately.
What paperwork can you provide?
We’re CHAS accredited, a Constructionline member and carry public liability insurance. Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote.
Do you work for managing agents and housing associations?
Yes, block and estate work is a core part of what we do. Buildings are scheduled in turn so you can plan around it.
Can weather delay the job?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.
Do you seal on top of existing sealant?
No, never. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
What if the old mastic contains asbestos?
We don’t remove asbestos-containing materials. If old sealant is suspected, work stops until it’s tested in line with the dutyholder’s asbestos management.