Construction and new-build mastic in Bishopsgate, City of London
We carry out mastic packages for new-build and refurbishment projects in Bishopsgate and the surrounding area. Send photos or drawings for a fixed quote.
- Bath and shower joints scraped during the final clean
- Mastic snags holding up handover
- New external sealant already peeling away
Construction mastic near Bishopsgate
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Construction mastic in Bishopsgate
On refurbishments, the mastic package usually includes cutting out old sealant as well as sealing new work. Old beads come out completely, as fresh silicone can’t grip old, and on older buildings we ask for the asbestos survey before disturbing anything. New and existing joints then get the same preparation. We work on window and door perimeters, brick and block movement joints and sanitary and kitchen joints, and the usual reasons a site gets in touch are cracks opening in caulked internal joints and perimeter gaps outside the sealant’s range. A specialist sealant contractor works differently from a general builder: on jobs in Bishopsgate, preparation and product choice get the time they need.
Around Bishopsgate, as across London, much of the work is refurbishing existing buildings as well as building new ones. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building.
We stand behind the joints we seal with a 12-month guarantee. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.
- Place
- Bishopsgate (E1, EC2A, EC1Y)
- Region
- City of London
- Guarantee
- A 12-month guarantee
- Price
- A fixed quote before we start
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
When it isn’t the sealant
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Joint design decisions that belong to the architect or engineer
- Faulty frames rather than failed sealant
- Frames fitted out of tolerance
Not sure which it is? You can phone 01277 525 020 or email a schedule or drawings and we will tell you honestly.
What we seal
- Internal decorators’ caulk
- Floor and skirting junctions
- Sanitary and kitchen joints
- Brick and block movement joints
- Cladding and panel joints
- Window and door perimeters
Signs you need construction mastic in Bishopsgate
Wide, tapered or inconsistent gaps around frames are a common problem. Every product has limits on how wide a joint it can bridge, so gaps outside that range need sorting by the installer first. Better to raise it at the start than seal a joint that’s bound to fail.
If one of these sounds familiar, it’s time for a closer look:
- Frame perimeters left unsealed or poorly sealed
- Bath and shower joints scraped during the final clean
- Perimeter gaps outside the sealant’s range
- Snag items on joints that need redoing before handover
New units and refits on sites such as Southwark Bridge Business Centre, 1 mile south-west of Bishopsgate, need their panel and perimeter joints sealed to the specification.
What to look for in a quote
- Will RAMS and insurance details be available?
- Which product they’ll use, and why it suits the joint
- Their pre-qualification and accreditations
- How joint depth will be controlled
Work for main contractors and building owners
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.
For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first, and our applicators hold CSCS cards.
After the work
A few simple habits keep the new joints working:
- Flag uneven or tapered frame gaps early
- Brief following trades on areas that have been sealed
- Ask cleaners to use soft cloths around fresh sealant
- Don’t force external sealing on a damp or frosty day
Tell the builders’ clean team which areas have new sealant. Blades and abrasive pads are the commonest cause of damage at the final clean.
Sanitary joints that fail early become defects soon after occupation. Water gets behind trays, vanity tops and panels, and the repair falls into the defects period. Getting the product and preparation right first time avoids that.
Our process
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Any old material is cut back to clean, sound faces, the manufacturer’s primer is applied where it’s called for, and each bead is tooled to a neat concave finish. Planning a London job such as one in Bishopsgate starts with access. Send the building rules and access times with your enquiry.
- Drawings, the sealant specification and your programme come to us for pricing.
- We return a fixed quote that ties the mastic package to your programme.
- You tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we confirm it with the quote.
- Work follows the programme, area by area, as rooms and elevations become ready.
- Every joint is prepared, set to depth and sealed with the specified product.
- We close out snagging and hand over with a 12-month guarantee.
Preparing the site
- Confirm the product named in the specification
- Let us know about inductions and permits
- Send your site hours and access windows
Getting a fixed quote
Photos, drawings or a schedule of the joints are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.
Related advice
Surface by surface
Bathrooms, en suites and washrooms
Sanitary joints around baths, showers, basins and WCs need anti-mould sanitary silicone. Joints are cleaned, sealed and tooled neatly and baths are loaded where appropriate before sealing.
Kitchens and utility areas
Commercial kitchens often need hygienic or food-safe sealants. We follow the specification and seal to a smooth, cleanable finish.
FAQs: Bishopsgate
Can you cope with the access rules in a London building?
Yes, we plan every London job around the building’s own access rules. Share the building’s contractor rules and we’ll work to them. The ULEZ covers the whole of Greater London, which we allow for
Would you work within a site like London Bridge Hospital?
Yes, healthcare and care buildings are part of our work. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Can one quote cover more than one building?
Yes. A group of buildings can go on one quote, with one point of contact.
Can you seal external joints in wet or cold weather?
Outside, the joint has to be dry and the temperature within the product’s limits. Damp, frost or condensation on frames can stop work.
How long does a typical visit take?
It depends on the scope, but the work normally takes a day or two on a small fit-out and several weeks on a large multi-storey package. Larger or phased jobs take longer, and we’ll give you a timescale with the quote.
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.
Do you use the sealant named in the specification?
We use the product the specification names. If we think an alternative would suit better, we put it to you first.
Construction mastic around Bishopsgate: points for this area
Bishopsgate has a good number of hotels close by, all within 2 miles. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up. The ULEZ covers the whole of Greater London, Bishopsgate included, so site vehicles need to meet its standards or pay the daily charge. Delivery slots and scarce storage shape how and when the mastic goes in.
For contractors at a college like London College of Marketing and Technology (under half a mile east of Bishopsgate), perimeters and internal sealant are timed for the holidays. University estates such as Coventry University London Campus, under half a mile north-east of Bishopsgate, tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal.
Bishopsgate is about 1 mile north-east of London, in City of London. We send applicators to Bishopsgate for mastic packages. 7 places across City of London fall within our area, including Bishopsgate.
Anyone looking for construction mastic in E1, EC2A and EC1Y gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. If your site is on Bush Lane, Swan Lane and Love Lane or close by, we can quote for mastic packages. With the A3 and A10 nearby, Bishopsgate is straightforward for us to reach. Sites close to Bishopsgate are covered too, including Aldgate (1 mile south-east), Spitalfields (1 mile east), City of London (1 mile west), Tower Hill (1 mile south) and Whitechapel (1 mile east).
Landmarks near Bishopsgate
We work on buildings around St Mary-at-Hill, Finsbury Circus and White Hart pub. Nearby too are The Aldgate School (less than half a mile south-east), Bishopsgate Institute Special Collections and Archives (under half a mile north-east) and Central Foundation Boys' School (0.7 miles north). Bishopsgate has its own railway station: London Liverpool Street station. Other landmarks nearby include Tower of London (0.6 miles south-east) and Gabriel's Wharf (1.2 miles south-west). Open spaces near Bishopsgate include Lavender Pond and Tower Hill.