Construction Mastic in Smithfield
Commercial sealant work in Smithfield for contractors, FMs and building owners: mastic packages for new-build and refurbishment projects, with a fixed quote first.
- Existing joints on a refurb that need cutting out and resealing
- Frame gaps too wide for sealant alone
- Sanitary sealant damaged by following trades
Construction mastic for Smithfield sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
How a job runs
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 before the next one starts. Planning a London job such as one in Smithfield starts with access. Send the building rules and access times with your enquiry.
- First we take quantities off the drawings and read through the specification.
- You receive a fixed quote listing scope, products and phasing.
- You tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we confirm it with the quote.
- Areas are sealed plot by plot or floor by floor as the trades hand them over.
- Each joint is prepared, backed to depth and sealed in the product the specification names.
- We close out snagging and hand over with a 12-month guarantee.
Preparing the site
- For older buildings, check the asbestos register before work
- Have the specification and drawings to hand
- Send your site hours and access windows
Get a fixed quote
Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we will return a fixed quote that you can work with. For a chat about it beforehand, speak to us on 01277 525 020 or send details through our quote form.
Related advice
Construction mastic in Smithfield
Mastic tends to be one of the final packages before handover, so it lands at exactly the point the programme is tightest. Mastic Doctor takes on mastic packages for main contractors and developers with projects in Smithfield, following the trades through the building as rooms and elevations become ready. We work on window and door perimeters, sanitary and kitchen joints and cladding and panel joints, and what we’re called in for most is oversized or tapered gaps around new frames and early adhesion failures on new external joints. Most enquiries from Smithfield start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
Construction in a London area such as Smithfield means working on constrained sites: small compounds, delivery slots and shared hoists and scaffold. Mastic is usually one of the last trades on each elevation or floor, so we keep to the programme and the order of trades the site sets.
We sign every job off with a 12-month guarantee. It’s a plain promise: if the work we did fails within twelve months, we return to fix it.
- Where
- Smithfield (EC1V, EC1P, EC1R)
- Wider area
- City of London
- Cover
- 12 months on our workmanship
- Price
- A fixed quote before we start
- Call
- 01277 525 020
- Updated
- 3 November 2026
New build and refits around Smithfield
Smithfield has a good number of hotels close by, all within 2 miles. When hotels extend or refit, the work is normally squeezed between peak periods, mastic included. As part of Greater London, Smithfield is inside the ULEZ, which applies to every van on site. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for.
For a contractor at a hotel such as Zetter Hotel, less than half a mile to the north of Smithfield, the mastic often has to be finished before a reopening date. Further education sites such as The Royal College of Radiologists (0.7 miles west of Smithfield) are extended and refurbished from time to time, with mastic often programmed into the summer break.
Smithfield is about 1 mile north of London, in City of London. Businesses, contractors and managing agents in Smithfield can call on us for mastic packages. Our City of London coverage takes in 7 places.
Commercial sites across EC1V, EC1P and EC1R are covered. Buildings on Oat Lane, Shoe Lane and Long Lane are within our area for mastic packages. Being close to the A1 and A4, Smithfield is easy to get to with materials and equipment. Close to Smithfield, our area also takes in Farringdon (1 mile north), Blackfriars (1 mile south), Holborn (1 mile west), Temple Bar (1 mile south-west) and Clerkenwell (1 mile north).
Near you in Smithfield
Around Smithfield, our work takes us to commercial buildings near Oriole pub, London Nautical School and St Alban's Church of England Primary School and the streets around them. Nearby too are St Mary-at-Hill (1 mile south-east), Barts Health Archives (under half a mile south-east) and Postman's Park (less than half a mile south-east). Smithfield has its own railway station: Farringdon station. Nearby you’ll also find Finsbury Health Centre (0.5 miles north-west) and Postal Museum (less than half a mile south-east). For a walk, there’s St. James's Park Lake and Ludgate Hill.
What we’re called out for in Smithfield
Dust is the enemy of adhesion on a construction site. Plaster dust, release agents, protective film residue and damp all stop sealant bonding.
Most enquiries start with something like this:
- New external sealant already peeling away
- Oversized or tapered gaps around new frames
- Internal caulk splitting as the building dries out
- Mastic snags holding up handover
Building work at universities like Queen Mary's University West Smithfield Campus, less than half a mile to the south-east of Smithfield, is often timed for the summer, mastic included.
What to look for in a quote
- Are they CHAS accredited or on Constructionline?
- Who will actually carry out the work
- Can the work be phased to keep areas open?
- How long is the guarantee, and what does it include?
Common questions from Smithfield clients
Is hospital work, at somewhere like St Bartholomew's Hospital, something you do?
Yes, healthcare and care buildings are part of our work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
Could you schedule work at a campus like Queen Mary's University West Smithfield Campus for the vacation?
Yes. Education sites normally want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Can staff carry on working while you’re here?
Yes, as long as we plan it. Tell us your site hours and access windows and we will plan around them.
Can you work to our specification?
The specification decides the product, and we’ll raise it if something in it doesn’t suit the joint. Product standards such as BS EN 15651 are often named in specifications.
What does a mastic package usually include?
The scope comes from the specification and drawings, but most packages include frame perimeters, sanitary and kitchen joints, caulking where specified and a snagging pass.
How long does a typical visit take?
That varies with the scale of the job, though a typical visit normally takes anything from a day of snagging to several weeks of plot-by-plot sealing on a phased scheme. Larger or phased jobs take longer, and we will give you a timescale with the quote.
What happens if it’s left?
Getting the mastic contractor involved early pays off. We can check joint widths, flag frames with gaps that won’t seal and confirm products against the specification, which avoids last-minute problems. Leave it late and they turn up on the snag list. Failed sealant in a building in Smithfield can quickly affect neighbours, tenants or the floor below. Dealing with it early is simpler for everyone.
Access can matter as much as the joints themselves: easy-to-reach joints are quicker than those that need equipment to get to. Tell us how the joints are reached and call for a quote.
Why clients in Smithfield choose us
- CHAS accredited
- Work to your specification and the manufacturer’s guidance
- Workmanship guaranteed for 12 months
- Fully insured, including public liability cover
Take a look at what affects the cost and our accreditations.
Nearby places to Smithfield
Other services in Smithfield
Maintenance after handover
After handover, these steps help:
- Record the products used in the O&M file
- Keep scrapers and abrasive pads off new beads
- Bring the mastic contractor in after the last trades are through
- Keep finished joints away from paint, plaster and scrapers
After we have sealed an area, it helps to keep other trades from damaging the joints. New beads should be left to cure before cleaning or decorating nearby; we confirm the time for each product.
Sealing outside when the joint is damp or too cold leads to poor adhesion. Waiting for a dry joint and the right temperature is better than redoing work.
Quoting for work in Smithfield
Sealant work doesn’t have a standard rate, since sites vary so much. What we take into account:
- The site’s rules and procedures
- Quantities, in metres or numbers
- The size and state of each joint
- Travel to remote or island sites
Cost follows what’s involved: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a fixed quote and we will explain how it’s made up.
Sending details for a quote
There’s no need for a formal survey. These details are enough to start:
- Any dates the work must fit around
- The asbestos register, for older buildings
- Clear photographs of the problem areas
- Where the site is, with the postcode
For a fixed quote, ring 01277 525 020 or send details through our quote form with the site address and an outline of the work. Our quote form is another easy route.
Owners, agents and contractors
Blocks and communal areas make up much of the work for housing associations and agents. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.
Agents, factors and owners’ representatives all follow the same route: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.