Facade and window perimeter sealing in North End, Greater London
Facade joint and window perimeter sealing on commercial buildings across North End, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Cold air coming in at window perimeters
- Perimeter joints where frames meet the structure
- Staining on stone next to old sealant
Facade sealing across North End
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Facade sealing in North End, done properly
We are often asked to look at water coming in around frames. Very often the perimeter bead has cracked or lost its grip. We’ll tell you if we think the leak is coming from somewhere sealant won’t fix. If you are dealing with weathered facade joints that have lost their grip and failed sealant on precast panel joints, we can help. Whether you call it commercial sealant work, mastic application or joint sealing, the work in North End is the same: the right product in a properly prepared joint.
Around North End, as across London, much of the work is refurbishing existing buildings as well as building new ones. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building.
Work we carry out comes with a 12-month guarantee. If an installation problem shows up, phone 01277 525 020 or email us and we’ll arrange a return visit.
- Where
- North End (NW3, NW11, N2)
- Wider area
- Greater London
- Guarantee
- 12 months on every job
- Quote
- Quoted before any work starts
- Call
- 01277 525 020
- Updated
- 3 November 2026
What sealant work can’t fix
A proper diagnosis includes knowing what sealant can’t do. We’ll tell you if the real problem is any of the following:
- Arranging specialist high-level access, which is planned with the client
- Joints whose design needs changing by the specifier
- Leaks from roofs, gutters or failed flashings rather than sealant joints
Not sure which it is? You can call the office on 01277 525 020 or email a schedule or drawings and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Stone and brick facade joints
- Shopfront frames
- Cladding panel joints
- Coping and flashing joints
- Perimeter joints where frames meet the structure
- Window and door perimeters
What the job involves on each surface
Render and coated surfaces
Sealant can only hold as well as the render or paint beneath it. Loose coatings are cleaned back first, and areas needing repair are flagged.
Brick and stone facades
Stone can absorb plasticisers from the wrong sealant. The specified stone-compatible sealant is what we use, and mask the edges carefully.
Site staff or a sealant specialist?
There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we’ll confirm the paperwork you need with the quote.
Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.
What sets the cost
A fixed quote reflects the actual work. It takes account of:
- The total length or number of joints
- Site requirements such as inductions and permits
- Removal of failed or old sealant
- How accessible the joints are
There’s no price list, since every building and every scope is different. Call for a quote and we’ll price your job on its own details.
What we need to price the job
However big the job, the same details help:
- Drawings or a marked-up plan, if available
- The asbestos register, for older buildings
- Your programme or deadline
- Photos of the joints, close up and from further back
Let us know the site, the scope and your timescale, and a fixed quote will follow. To get it moving, phone 01277 525 020 or email the details over.
Towns and villages near North End
More services for North End
Mastic packages on North End sites
Site traffic in North End falls within London’s ULEZ, like everywhere else in Greater London. Add booked deliveries and tight storage, and the mastic package needs planning with the site team. A 2-mile radius around North End takes in a good number of hotels. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades.
Work at a hotel such as Anchor House Hotel (0.6 miles west of North End) tends to be programmed around bookings, mastic included. On a healthcare site such as Nuffield Health Highgate Hospital, 1.2 miles to the north-east of North End, new blocks and refurbishments go on while the hospital keeps running, so mastic work is sequenced carefully. Further education sites such as St. Giles College, 1.9 miles to the east of North End, are extended and refurbished from time to time, with mastic often programmed into the summer break.
North End is about 1 mile north of Greenhill, in Greater London. Businesses, contractors and managing agents in North End can call on us for facade joints. North End is one of 764 places we cover in Greater London for facade joints. There’s a separate page for London, roughly 6 miles from North End.
Anyone looking for facade sealing in NW3, NW11 and N2 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. Among the streets we cover are Sandy Road, Park Avenue and Platt's Lane. North End sits on or close to the A502. We also cover 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). Bigger towns within reach include 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
Locally, jobs take us to sites close to The Old Bull and Bush pub, Childs Hill Park and The Henrietta Barnett School, among other places. The closest station to North End is Hampstead Heath station, roughly 1.1 miles south-east. Other landmarks nearby include 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.
From enquiry to sign-off
The first thing on site is a walk round with your contact, agreeing which joints are in scope, where to start and what must stay open. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. In North End, most buildings stay in use during the work, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.
- We plan access and the order of elevations with the client.
- Weather and temperature are checked against the product’s limits.
- We remove the old bead and check the edges are sound.
- Joints are cleaned, primed if required and fitted with backing rod.
- Facade-grade sealant goes in and is tooled to a tidy concave profile.
- We hand over with our 12-month workmanship guarantee.
Before we start on site
- Flag any permit to work we will need
- Have the specification and drawings to hand
- Tell us which areas need to stay in use
Quotes
We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To start the process, speak to us on 01277 525 020 or email drawings and photos.
Read more
North End: questions and answers
Does your area include sites such as Brent Cross Shopping Park, near North End?
Yes. We cover North End and the area around it, including industrial estates, business parks and retail parks such as Brent Cross Shopping Park. Send details of the unit and the work through our quote form for a quick quote.
Can you work around term dates at a campus such as American University in London?
Yes, holiday working periods are the norm on campus jobs. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Will you check whether the sealant is causing the leak?
Yes. Photos are often enough to start, followed by a visit if needed. Many frame leaks are sealant failures, though not all, and we will be honest about which it is.
Who decides which product is used?
The specification comes first, if there is one. Without one, the joint decides: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
How soon can the area be used again?
The product and site conditions decide that. Some take light use quickly, others need longer to cure, and we confirm it before leaving site.
What site paperwork can you supply?
Let us know which documents the site needs, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm them with the quote.
Do you replace windows or glass?
No. A glazing contractor handles that. What we seal are the joints around frames and panels across the facade.
Maintenance after handover
Your facilities or cleaning team can help the joints last. Pass these on to them:
- Investigate damp beside windows promptly
- Ask about asbestos in pre-2000 mastic
- Plan facade sealing alongside redecoration
- Keep pressure washers away from fresh sealant
Hold back any cleaning crew until the joints have had their stated cure time. Pressure washers and harsh cleaners can damage a fresh bead, so brief your window cleaners.
Coordinate facade sealing with other external works. One set-up for several trades saves money and cuts time on site.