North Finchley mastic sealing
Mastic sealing for building owners, managing agents and housing associations across North Finchley, by CSCS-carded applicators. Fully insured and CHAS accredited.
- Communal area joints that look neglected
- Estate-wide sealant that is simply worn out
- Water getting in round frames after rain
Mastic sealing for businesses in North Finchley
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
How we handle mastic sealing in North Finchley
Managing agents and housing associations normally need paperwork before anyone starts. For documents, tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We’re a Constructionline member and CHAS accredited, and we carry public liability insurance. If you have movement joints with sealant missing and occupiers reporting cold air round windows, we can put it right. One point of contact handles commercial sealant work in North Finchley from the first photos to the final walk-round, whether it’s one building or several.
In a London area such as North Finchley, 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 sign every job off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.
- Place
- North Finchley (N12, N20, N11)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Call
- 01277 525 020
- Page updated
- 3 November 2026
What happens if it’s left?
Piecemeal repairs over the years often leave mismatched sealant. Resealing a whole building gives a consistent finish. Failed sealant in a building in North Finchley can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Putting it right early is less disruptive than dealing with the consequences.
Pricing mastic joints depends on quantities, condition and access, and any specification that applies. Call for a quote.
Why appoint us
- Colours chosen to suit frames, cladding or finishes where possible
- CHAS accredited
- Work to your specification and the manufacturer’s guidance
- 12 months’ guarantee on every job
Read what affects the cost or our accreditations.
Nearby places to North Finchley
More services for North Finchley
Questions about North Finchley
Is Finchley Industrial Centre, near North Finchley, within your area?
Yes. Estates, retail parks and business parks around North Finchley, Finchley Industrial Centre among them, are all within reach. To start, just speak to us on 01277 525 020 or email the details over with the unit, the joints involved and your access times.
Can you work in a London building with booked loading and goods-lift slots?
Yes, most London buildings have access rules of some kind, and we plan around them. Send the building rules and access times with your enquiry. We allow for the ULEZ, which covers every borough
Will you just go over the old sealant?
No. Sealing over old material is one of the classic causes of early joint failure, so it all comes out first.
Do you work to architects’ specifications?
Yes. Send it with your enquiry, and the quote will be based on it.
Who decides which product is used?
The specification comes first, if there is one. Without one, the joint decides: its movement, its surfaces and what it has to cope with.
Can you seal joints high up on a block?
Access is discussed and agreed before the quote is fixed. Tell us the building height and any access already in place and we’ll confirm the approach in the quote.
What will the job cost?
There isn’t a price list, because every site is different. Send photographs or drawings and we’ll price it at a fixed figure.
On site: what to expect
Site rules come first: sign-in, induction and whatever permit system the building uses. With the paperwork done, we take the joints in the sequence agreed with you, and each area is checked before we leave it. All of Greater London is in the ULEZ, and kerbside space in North Finchley can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- First we look at the mastic on each building and note what needs replacing.
- A fixed quote follows, split by block or building if that suits you.
- Dates, areas and access are agreed so residents or tenants can be told in advance.
- We remove the old mastic completely and clean the joint faces back.
- Backing rod and primer go in as the joint requires, then the new bead is placed and tooled.
- Finished joints are looked over and the 12-month guarantee confirmed.
Getting the site ready
- Clear stock, furniture or equipment away from the joints
- Arrange parking or a loading space
- Let us know about inductions and permits
Ask for a quote
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to call the office on 01277 525 020 or email a schedule or drawings with what you know.
Advice
Commercial clients in North Finchley
Planned maintenance programmes are welcome: working through a building or an estate in stages that fit your budget. Sites in North Finchley can sit alongside others in a wider programme.
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.
Mastic sealing in North Finchley: the local picture
For a London block, the agent or landlord usually handles notices to residents and access to flats. We fit the programme to your notice periods. There are seven care or nursing homes within about 2 miles of North Finchley. Frame mastic on care buildings is best renewed elevation by elevation, with the manager deciding timings.
Owners of student blocks near Middlesex University, 3.2 miles south-west of North Finchley, can schedule frame and external mastic for the summer vacation. If you own or manage units on a site such as Finchley Industrial Centre, which lies north-west of North Finchley, failed mastic on frames, door surrounds and external joints can be dealt with unit by unit. Blocks of flats and mixed-use buildings often cluster around stations such as New Southgate station (to the east of North Finchley) and their window and balcony mastic tends to age at the same rate across a building.
North Finchley is about 1 mile north of Finchley, in Greater London. Anywhere in N12, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. North Finchley is one of 764 places we cover in Greater London. There’s a separate page for London, roughly 9 miles from North Finchley.
If you need mastic sealing in N12, N20 and N11, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. If your site is on High Road, Lodge Lane and Percy Road or close by, we can quote for mastic joints. Main routes into North Finchley include the A1000. We also cover Woodside Park (1 mile west), Oakleigh Park (1 mile north), Whetstone (1 mile north), Friern Barnet (1 mile east) and Finchley (1 mile south) for mastic joints. Nearby towns on our patch include London (9 miles south-east), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (7 miles south) and Shoreditch (8 miles south-east).
Near you in North Finchley
Locally, jobs take us to sites close to Friary Park, Woodhouse College and The Bohemia pub and the streets around them. Nearby too are Francis Skaryna Belarusian Library and Museum (0.5 miles west) and St Michael's Catholic Grammar School (less than half a mile south-west). North Finchley’s nearest station is New Southgate station, roughly 1.4 miles east. A little further out are Finchley Memorial Hospital (0.8 miles south) and Francis Skaryna Belarusian Library and Museum (0.5 miles west). Not far away are Darland's Lake and Glebelands Local Nature Reserve.
Honest limits
Honesty saves time and money. New sealant won’t cure:
- Frames that are rotten, warped or broken
- Masonry that has broken away beside the joint
- Glazing that needs replacing
If you are not sure, just call the office on 01277 525 020 or use the quote form and we will give you a straight answer before you book.
Surfaces we seal
- External wall and movement joints
- Communal kitchens and washrooms
- Window and door perimeters on blocks
- Communal entrances and stairwells
- Balcony and threshold joints
- Shopfronts below residential blocks
Doing it in-house
There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are easy to get wrong without experience.
How the quote is worked out
Before we quote, we look at:
- Removal of failed or old sealant
- Site requirements such as inductions and permits
- The product specified
- The total length or number of joints
Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote and we will put a fixed figure on it.
Details that help us quote
Good information means a firmer quote. Helpful details to send:
- Asbestos survey details if the building is older
- The type of building and who uses it
- Your programme or deadline
- Photos of the joints, close up and from further back
Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. The easiest way is to call the office on 01277 525 020 or use the quote form.