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

Floor Joint Sealing contractors in High Barnet

Our CSCS-carded applicators take on floor joint sealing and filling in warehouses, factories and industrial units in High Barnet and the surrounding area. Send photographs or drawings for a fixed quote.

  • Old filler gone hard, cracked or loose
  • Grimy joint lines spoiling a showroom floor
  • Joint fill separating from the concrete
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
South East, London & Scotland
CHAS & Constructionline
£5m public liability

Floor joint sealing for High Barnet sites

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

How a job runs

When we get to site, we report to your site contact and complete whatever induction the building runs. Everything around the joints gets protected before any cutting starts, and the work usually takes a day or more, depending on the metres of joint and how many zones the floor is split into. For a job in High Barnet, access comes first. Send the building rules and access times with your enquiry.

  1. First comes a walk of the floor to record joint sizes, broken edges and traffic routes.
  2. The quote fixes the price, names the filler or sealant and shows how the floor will be zoned.
  3. We remove failed material and packed debris until sound concrete is exposed on both faces.
  4. We vacuum each run and prime it if the chosen product requires a primer.
  5. Filler or sealant goes in to the right depth and is finished flush with the slab.
  6. We tell you when each zone can carry trucks again and move on to the next.

What we need from you

  • Move anything stored against the joints
  • Tell us what induction or permit system the site runs
  • Point out any areas we must not close

Getting a fixed quote

Quotes are fixed against the scope you send, so the cost is agreed before work starts. To start the process, call the office on 01277 525 020 or send photos by email.

Get a price

Related advice

Floor joint sealing in High Barnet

Floor joint sealing for us covers warehouse aisles, loading bays, production halls, retail floors and showroom slabs. Pricing depends on the length of joint, how worn the edges are and when we can get in and the figure is fixed before work begins. If you are dealing with broken arrises where pallet trucks cross and drivers complaining about joints on a route, we can put it right. A specialist sealant contractor works differently from a general builder: on jobs in High Barnet, preparation and product choice get the time they need.

Around High Barnet, as across London, joints are under constant load, from basement car parks and loading bays to podium decks and busy mall floors. When a joint fails, grit and water get in and the arrises start to break up, so it pays to act early.

A 12-month guarantee applies to all our work. If an installation problem shows up, call 01277 525 020 or send details through our quote form and we will arrange a return visit.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
High Barnet (EN5)
Region
Greater London
Guarantee
12 months on every job
Price
Quoted before any work starts
Phone
01277 525 020
Updated
3 November 2026

Honest limits

We seal joints; we don’t mend everything behind them. Sealant alone won’t deal with:

  • Wide or random cracking that suggests a structural issue
  • Broken concrete either side of the joint
  • Level or flatness problems across the floor

If in doubt, call 01277 525 020 or email the details over and we will say what we think.

Where we work in High Barnet

  • Saw-cut induced joints
  • Forklift and pallet-truck routes
  • Loading bays
  • Construction joints
  • Joints along racking aisles
  • Retail and showroom floors

Floor joint sealing in High Barnet: the local picture

Basement car parks and service yards in London tend to be in use all working day, so we seal in sections and hand areas back as each cures. At least three named trading, business or retail sites lie within about 3 miles of High Barnet. Floors, loading bays and yards on sites like these are where floor and movement joints work hardest.

For estates staff at a university like Middlesex University (4.4 miles south of High Barnet), building and paving joints are part of the planned maintenance list. Sites like Barnet Hospital (0.5 miles south-west of High Barnet) carry ambulances, deliveries and visitors’ cars over their road and deck joints. Across sites such as Wrotham Business Park, which lies north of High Barnet, floor and movement joints can be sealed in phases so units keep working.

High Barnet is about 1 mile north-west of Barnet, in Greater London. If you’re looking for floor joint sealing in High Barnet, we can help, as we do across Greater London. Our Greater London coverage takes in 764 places. Our London page has more on work in that area.

Business premises anywhere in EN5 are within our area. Among the streets we cover are Byng Road, Park Road and Kings Road. Main routes into High Barnet include the A1081. Close to High Barnet, our area also takes in Hadley (1 mile east), Arkley (1 mile south-west), Kitts End (1 mile north), Totteridge (1 mile south) and Rowley Green (2 miles west). Nearby towns on our patch include London (12 miles south-east), City of Westminster (10 miles south), Marylebone (10 miles south), Kensington (11 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).

What’s near High Barnet

Locally, jobs take us to sites close to Susi Earnshaw Theatre School, The White Lion pub and Queen Elizabeth's School. High Barnet’s nearest station is Hadley Wood station, roughly 1.6 miles north-east. Other landmarks nearby include Spires Shopping Centre (less than half a mile east) and Barnet General Hospital (0.5 miles south-west). Green spaces nearby include Barnet Countryside Centre and Darland's Lake.

Map of High Barnet © OpenStreetMap contributors

Should maintenance staff do it?

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.

The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.

Building owners, agents and FMs in High Barnet

Planned maintenance programmes are welcome: working through a building or an estate in stages that fit your budget. Sites in High Barnet can sit alongside others in a wider programme across Greater London.

As a CHAS accredited contractor and Constructionline member, we are straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.

Why deal with it now?

Some runs only need partial renewal or topping up. Where existing filler is well bonded and the gap beside it is small, a full strip-out isn’t always needed, and we’ll say which joints need what. Getting scaffold, permits or access booked in High Barnet takes effort, so it makes sense to deal with every failing joint while access is in place.

The product called for affects the cost, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site rules also count.

Why appoint us

  • Work carried out by CSCS-carded applicators
  • Over 20 years of commercial sealing
  • Products installed to the manufacturer’s instructions
  • Old sealant cut out, never sealed over

Take a look at what affects the cost or our accreditations and insurance.

What sets the cost

Sealant work doesn’t have a standard rate, because every site is different. What we look at:

  • Location, for remote and island sites
  • The site’s rules and procedures
  • Any access equipment needed
  • Working within restricted access windows

There’s no price list, because the scope varies so much from one building to the next. Call for a quote.

What to include in your enquiry

The more we know, the firmer the quote. Helpful details to send:

  • Any specification or named product
  • The type of building and who uses it
  • Photos of the joints, close up and from further back
  • Rough lengths or quantities, or drawings if you have them

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to ring 01277 525 020 or send details through our quote form with what you know.

FAQs: High Barnet

Do you work in London buildings with loading restrictions?

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. All of Greater London is inside the ULEZ, and our planning allows for it

Can you work at a site such as Hadley Manor Trading Estate, by High Barnet?

Yes, sites like Hadley Manor Trading Estate are within our area, along with the rest of High Barnet. To start, just speak to us on 01277 525 020 or use the quote form with the unit, the joints involved and your access times.

How do you deal with asbestos in old sealant?

The duty to manage asbestos sits with the building’s dutyholder, so for older buildings we ask for the asbestos register first. If anything suspect turns up, we stop until it’s tested.

Can you work to our specification?

Yes. Send it with your enquiry, and we will price the work to it, flagging anything that needs clarifying.

Are you insured?

Yes. We are fully insured, and the certificate can go with your quote.

Can the sealant be colour-matched?

That depends on the product. Some ranges offer many colours, others very few, so we’ll confirm the colours available for the specified product with the quote.

Can you phase floor joint work around operations?

We phase it. We work aisle by aisle or zone by zone so the rest of the floor stays in use. Tell us your site hours and access windows and we will plan around them.

Accreditations

Trusted. Accredited. Insured.