Mastic sealing for building owners and managing agents in North End, Greater London
Mastic sealing for building owners, managing agents and housing associations in North End and across Greater London. CHAS accredited and fully insured, with a 12-month guarantee.
- Water getting in round frames after rain
- Draughts at frames across a block
- Window mastic that has split and shrunk
Mastic sealing for businesses in North End
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Maintenance after handover
Problems stay small when the joints are checked regularly. Specifically:
- Make mastic part of routine maintenance checks
- Protect low-level joints in entrances
- Prioritise elevations facing the weather
- Check the asbestos register before any old mastic is disturbed
Where a paintable product was specified, it can be painted after curing. Silicone normally can’t be painted, so keep decorators off it.
One failed perimeter typically means others on the same building are close so a single failure is a sign to check the rest. Doing them together saves going back again and again.
Mastic sealing in North End
For over 20 years we have resealed joints for owners, agents and landlords. Our applicators are CSCS-carded, and the work is backed by public liability insurance. Each building we complete carries a 12-month guarantee on our workmanship. The enquiries we see most involve worn sealant at communal door frames and open joints in brickwork or panels, on external wall and movement joints, shopfronts below residential blocks and balcony and threshold joints. A single leaking joint is often how a building in North End first comes to us: we look at the rest while we are there and tell you what we find.
London has a large stock of purpose-built blocks, mansion flats and converted buildings managed by agents and housing associations. Window and door perimeters, balcony joints and communal areas all have mastic that ages together across a building.
Our workmanship is guaranteed for 12 months, in North End as everywhere else we work. If our installation lets you down in that time, we return and fix it.
- Place
- North End (NW3, NW11, N2)
- Region
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Planned mastic for North End portfolios
The 2 miles around North End include six care or nursing homes. Owners of care premises can bring window and door mastic into a phased programme planned around the home. Blocks in London are usually run by managing agents, landlords or housing associations, with residents to notify and access to arrange. We fit the programme to your notice periods.
For a school such as The King Alfred School, perimeter mastic on windows and doors is a holiday job. Student blocks close to universities like American University in London, 2.9 miles to the east of North End, are easiest to work on between tenancies. If you are responsible for a building such as Church of St Alban the Martyr, frame and door mastic needs the same attention as any other property.
North End is about 1 mile north of Greenhill, in Greater London. We send applicators to North End for mastic joints, handled exactly as we handle every other area. 764 places across Greater London fall within our area, including North End. For work in that direction, see our London page (6 miles or so).
We cover the NW3, NW11 and N2 postcode districts. For a building on Sandy Road, Park Avenue and Platt's Lane or nearby, send details and we’ll quote for mastic joints. Being close to the A502, North End is straightforward for us to reach. Close to North End, our area also takes in Vale of Health (1 mile south-east), Childs Hill (1 mile south-west), Golders Green (1 mile north-west), Greenhill (1 mile south) and West Hampstead (1 mile south). Further afield, our area takes in London (6 miles south-east), City of Westminster (4 miles south), Marylebone (4 miles south-east), Kensington (5 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles south-east).
Around North End
We work on buildings around The Old Bull and Bush pub, Childs Hill Park and The Henrietta Barnett School and the streets around them. The nearest railway station is Hampstead Heath station, roughly 1.1 miles south-east. A little further out are O2 Centre (1.4 miles south) and New End Hospital (0.7 miles south). The countryside around North End includes Turner's Wood and Darland's Lake.
What the job involves on each surface
Tenement and older buildings
Older mastic can contain asbestos, so we check the asbestos register or survey first. If it’s suspected, work stops until it’s tested.
Commercial and mixed-use buildings
Tenants in commercial buildings need to keep trading, so we plan around them.
On site: what to expect
Diagnose, treat, sign off: that’s the shape of every visit. First comes an inspection and agreement on scope, then we prepare and seal each joint with the specified product, and we finish with a walk round so the work can be signed off. In North End, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- We check the asbestos register for older buildings and look at the joints.
- The products and programme are set out in a fixed quote.
- We strip out the old sealant.
- Joint faces are cleaned, backed and resealed.
- Buildings are completed in turn.
Preparing the site
- Point out parking and an unloading spot
- Move anything stored against the joints
- Let us know about inductions and permits
Getting a fixed quote
Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. For smaller jobs, photos and a description will do.
Read more
Honest limits
Being straight saves everyone time. New sealant won’t cure:
- Failed window or door frames, which need a window contractor
- Masonry that has broken away beside the joint
- Roof leaks, gutters or failed flashings that aren’t sealant joints
If you are not sure, just speak to us on 01277 525 020 or email us and we will give you a straight answer.
What we seal
- Balcony and threshold joints
- External wall and movement joints
- Communal entrances and stairwells
- Window and door perimeters on blocks
- Shopfronts below residential blocks
- Communal kitchens and washrooms
For managing agents and facilities managers
Main contractors use us as their sealant subcontractor. We work to your programme, your specification and your site rules.
We work for building owners and managing agents on everything from one building to a spread of sites around North End. Several sites can go on one quote, which keeps the paperwork simple.
Nearby places to North End
More services for North End
North End: questions and answers
Will you work in a care home in North End without moving residents out?
Yes, with the manager deciding the order and timing of rooms. Tell us about any infection-control or safeguarding requirements and we will work to them.
Will you take on a block within reach of Hampstead Heath station?
Yes, and several blocks can go on one quote. Give us the building’s details and say how residents are notified, and we’ll quote and plan to suit.
How do you reach windows on upper floors?
We talk through access for each building when we quote. Tell us the number of storeys and whether scaffold or other access is planned and we’ll confirm the approach in the quote.
Does the weather affect the work?
It can, when the joints are outside. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so we watch the forecast and rearrange outside work if we have to. Internal work is far less affected.
Can you follow the specification on our project?
Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it, flagging anything that needs clarifying.
When is resealing likely to be due?
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.
How many days will you need on site?
It depends on the scope, though a typical visit typically takes anything from a day to a few weeks, depending on the number of buildings and joints. For bigger or phased jobs, we’ll set out a timescale with the quote.
Leave it or put it right?
Dealing with failed joints one report at a time is slow and scattered. A planned programme treats each building once and is simpler to manage and budget. Failed sealant in a building in North End can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Dealing with it early is simpler for everyone.
Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well.
Why appoint us
- Old sealant cut out, never sealed over
- One number for every site we cover
- A Constructionline member, so easy to vet
- Specification-led, product-correct work
Read what affects the cost and our accreditations.