Greater London · England
Commercial sealant contractors in NW7
Commercial sealant, construction mastic and joint sealing across NW7, from Mill Hill, Burnt Oak and Edgware, with a fixed quote before we start.
Need sealant work in NW7?
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Towns and villages in NW7
Our services across NW7
- Industrial and floor joint sealing
- Expansion and movement joint sealing
- Construction and new-build mastic
- Facade and window perimeter sealing
- Commercial washroom and wet-area sealing
- Commercial sealant contractors
- Mastic sealing for building owners and managing agents
- Fire-rated sealing and fire stopping
- Coloured and colour-matched sealant
- See all services
Tell us what needs doing and your postcode and we’ll come back with a price: speak to us on 01277 525 020 or email drawings and photos.
How commercial sealant contractors works in NW7
Most of the buildings we seal stay open while we’re there. Tell us your site hours and access windows and we will plan around them. That applies whether the building is an office, a shop, a hotel, a college or a care home. Most enquiries involve expansion joints with the sealant torn out and smeared sealant across finishes from a rushed job, on movement joints in walls and floors, washrooms and tea points and external facade joints.
We schedule the visit to fit the site hours and access windows you give us. On the day, the work area is kept contained and tidy, and your contact hears from us before we move to the next area.
- Site photos, drawings or a visit tell us what’s there and how it has failed.
- A fixed quote follows, with removal and preparation included.
- Sequence, access and working times are settled before the first joint is touched.
- Each joint is stripped, cleaned back to sound faces and primed where the maker specifies.
- Depth is set with backing, then the sealant is applied, tooled and the area tidied.
- We hand back each area with its cure time and our 12-month guarantee.
What you’ll pay
The specified product makes a difference, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site requirements come into it too.
Why choose Mastic Doctor
- Fully insured
- Work to your specification and the manufacturer’s guidance
- Constructionline member
- Work carried out by CSCS-carded applicators
Request a quote
Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings you can plan around. If you have questions first, ring 01277 525 020 or email the details over.
Around Mill Hill
In Mill Hill, that means premises near Copthall School, St Paul's CofE Primary School NW7 and Bittacy Hill Park, among other places. Also close by are St Paul's Church (less than half a mile north-west), Mill Hill School (under half a mile south), Rising Sun pub (0.7 miles north-west) and Francis Skaryna Belarusian Library and Museum (2 miles east). For rail, the closest station is Mill Hill Broadway station, about 1 mile south-west of the centre. Well-known places in the area include Broadwalk Centre (2 miles west) and Francis Skaryna Belarusian Library and Museum (2 miles east). The countryside around Mill Hill includes The Mill Field and Darland's Lake.
Commercial premises across NW7
Commercial buildings across NW7 range from older premises altered many times to recent units on business parks. Each building needs the right product for its surfaces, from stone and brick to coated aluminium and laminate.
Around the motorway corridors of the South East, business parks and industrial estates are common, and NW7 is part of the area we cover.
Mill Hill: Shopping centres and retail parks such as Broadwalk Centre, 2 miles to the west of Mill Hill, see a steady turnover of shop fits, each leaving joints where colour and finish matter. With Mill Hill inside the ULEZ and kerb space scarce, we sort access and loading before the first day on site.
Site staff or a sealant specialist?
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.
Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Work for main contractors and building owners
Blocks and communal areas make up much of the work for housing associations and agents. We phase the work so people keep access, and each stage is agreed with your contact.
Main contractors use us as their sealant subcontractor, on new build and refurbishment alike. Programme, specification and site rules come first, and our applicators hold CSCS cards.
Leave it or put it right?
Some managers wait for a fit-out before touching the mastic. For internal joints that are only cosmetic, that can make sense, but a joint letting water in now keeps doing damage until the refurb arrives. We can seal the urgent joints now and leave the rest for the programme.
What your quote should include
- Is the sealant right for the movement and the substrate?
- The terms of the workmanship guarantee
- Who will actually carry out the work
- Their pre-qualification and accreditations
Aftercare for building managers
Once the work is signed off, a little attention goes a long way:
- Check sealant as part of routine building inspections
- Have extract fans checked so wet areas dry out
- Check the asbestos register before anyone disturbs old sealant in an older building
- Log reseals in the O&M or maintenance records
In washrooms and kitchens, extraction makes a real difference to sealant life. Fans that are broken or switched off leave joints damp for longer. It’s worth having fans checked while the sealant is fresh.
Once sealant fails in a movement joint, grit and debris get in. With nothing soft to close against, the materials either side take the load and start to break up. At that point it’s a repair job rather than a reseal.
What we are called out for in NW7
Plenty of failed joints were never sealed with the right product. Painters’ acrylic in a moving joint, vinegar-smelling silicone on metal or natural stone, or a high-modulus product where a low-modulus one was needed all let go sooner than they should. Guidance such as BS 6213 exists to steer sealant selection for exactly this reason, and many specifications refer to it.
Common reasons buildings call us in:
- Expansion joints with the sealant torn out
- Leaks that seem to come through a sealant line
- Messy, uneven beads from earlier work that let the building down
- Frame sealant that has cracked, shrunk or pulled away
Questions about NW7
How long will the new sealant last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
Is it OK to apply fresh sealant over existing beads?
Full removal is part of every quote. Sealing over traps water and lifts once the joint moves and isn’t worth paying for.
Will you just go over the old sealant?
No, never. Sealing over old material is one of the classic causes of early joint failure, so it all comes out first.
Does weather matter for sealant work?
It can, when the joints are outside. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so external work may be moved if conditions aren’t right. Internal work is far less affected.
Do you hold CHAS accreditation?
Yes. We’re CHAS accredited, we’re a Constructionline member and we use CSCS-carded applicators.
Can you handle sealant work across several sites?
Yes. Send a list of addresses and what’s needed at each, and fixed prices follow, with a suggested sequence.
Is your work guaranteed?
The work is guaranteed for 12 months. Should a joint we sealed give trouble during those 12 months, let us know and we will look at it.