Facade and window perimeter sealing in Hendon, Greater London
Sealant work in Hendon for main contractors, managing agents and facilities managers: facade joint and window perimeter sealing on commercial buildings, quoted at a fixed price.
- Unsightly perimeter sealant on a visible elevation
- Perimeter sealant that has split or peeled away
- New sealant peeling off old mastic
Facade sealing for Hendon sites
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
On site: what to expect
Working in a building that stays open takes some planning. The work area is signed and kept contained, keep walkways clear and work section by section so the rest of the building stays in use. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. Let us know about any on-site parking or loading arrangements when you send the job details.
- Access, site rules and timing are settled with the client up front.
- Weather and temperature are checked against the product’s limits.
- Each joint is cut out and the edges inspected.
- Faces are cleaned, primed where needed and backed.
- Sealant is gunned in and tooled hard onto both faces.
- Once signed off, the work carries our 12-month guarantee.
What we need from you
- Arrange parking or a loading space
- Send any specification or drawings in advance
- Make sure the joints can be reached
Get a fixed quote
The quickest route to a quote is a few photos and the site postcode. Send them through the quote form, or call the office on 01277 525 020 or email us to discuss it first.
Related advice
How we handle facade sealing in Hendon
Installing framed glazing systems isn’t part of our work. What we seal are the joints around them: perimeter joints where frames meet the structure, panel joints and window perimeters with products suited to facade or glazing perimeter joints. If you have air leaks through failed facade joints and staining on stone next to old sealant, we can help. Most enquiries from Hendon start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
Every London site, Hendon included, is inside the ULEZ, which applies to deliveries and contractors’ vans alike. Add booked delivery slots and limited storage, and a London mastic package needs planning before the first bead.
Guaranteed is the last step of every job. Our workmanship is backed for 12 months, and the quote explains what it covers.
- Location
- Hendon (NW4, NW9, NW2, NW11)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Site staff or a sealant specialist?
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.
A short, simple internal joint is often within reach of a maintenance team. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Hendon: questions and answers
Can you cope with the access rules in a London building?
Yes. Inductions, permits and timed loading are routine for us in London. The building manager’s rules go straight into our method. We allow for the ULEZ, which covers every borough
Can work at a site such as Middlesex University fit around teaching?
Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. We are CHAS accredited and a Constructionline member, and paperwork such as RAMS is confirmed with the quote.
What will the job cost?
Every job gets its own fixed quote. To get one, speak to us on 01277 525 020 or email a schedule or drawings with a description of the work.
Can you just add new sealant on top?
No. Overlaying is a shortcut that peels away quickly. Our method is a full cut-out, cleaning, backing and a new bead.
How long before the joints can be used?
Curing time varies by product, and we confirm it on the day, and sign any area that should be left alone.
Do you use silicone for external joints?
Low-modulus, neutral-cure silicone suits many facade and perimeter joints. Hybrid or MS polymer, polyurethane and polysulphide sealants suit others, as the specification or substrate requires.
Can you send site paperwork?
Each site asks for different documents, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.
What else we do in Hendon
Signs you need facade sealing in Hendon
New sealant run over old sealant rarely holds. Cured silicone won’t accept a new silicone bead.
If one of these sounds familiar, it’s time for a closer look:
- Weathered joints at frame-to-structure perimeters
- Discoloured or dirty facade joints
- Facade joints cracked through the middle
- Gaps between rainscreen or cladding panels
For a contractor at a hotel such as The Pillar Hotel, which lies east of Hendon, the mastic often has to be finished before a reopening date.
Comparing quotes
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- How they’ll work around occupants
- Health and safety accreditation such as CHAS
- Proof of insurance
Facade sealing around Hendon: what changes locally
Plenty of hotels sit less than 2 miles from Hendon. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight. Site traffic in Hendon falls within London’s ULEZ, like everywhere else in Greater London. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for.
University estates such as Middlesex University (1.1 miles north-west of Hendon) tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal. When a college such as College of North West London, 2.4 miles to the south-west of Hendon, builds or refurbishes, the mastic package usually has to fit around students and staff.
Hendon is about 3 miles north-west of Hampstead, in Greater London. We send applicators to Hendon for facade joints, handled exactly as we handle every other area. We work across 764 places in Greater London. London is covered too, around 8 miles from Hendon.
We take on facade joints across the NW4, NW9, NW2 and NW11 postcode area, for business premises of every kind. Streets here include Church Road, Station Road and Sydney Grove. With the A5 and A41 nearby, Hendon is straightforward for us to reach. If your building is just outside Hendon, we cover The Burroughs (1 mile north-west), Brent Cross (1 mile south), Staples Corner (1 mile south), West Hendon (1 mile west) and The Hyde (1 mile west). A short drive away, we cover London (8 miles south-east), City of Westminster (6 miles south-east), Marylebone (6 miles south-east), Kensington (6 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles south-east).
Near you in Hendon
Recent enquiries here include premises near Hasmonean Primary School, The White Bear pub and Kisharon College and the streets around them. For rail, the closest station is Hendon station, about 0.7 miles south-west of the centre. Well-known places in the area include Brent Cross Shopping Centre (0.5 miles south) and St Andrew's Hospital (1.6 miles south). Green spaces nearby include Darland's Lake and Parliament Hill.
When it isn’t the sealant
Some faults sit outside our scope, and we point that out rather than sealing over them:
- Work on the window or framing system itself
- Providing access systems for the work
- Joints too narrow for the movement they take, which need redesign
Not sure which it is? You can give us a call on 01277 525 020 or use the quote form and we will tell you honestly.
Where we work in Hendon
- Window and door perimeters
- Perimeter joints where frames meet the structure
- Cladding panel joints
- Coping and flashing joints
- Shopfront frames
- Stone and brick facade joints
What affects the price in Hendon
A fixed quote reflects the actual work. It takes account of:
- Site requirements such as inductions and permits
- Any access equipment needed
- How much existing material needs removing
- Whether the work must be split into stages
We don’t publish prices, because the scope varies so much from one building to the next. Call for a quote and we will price your job on its own details.
What to include in your enquiry
It doesn’t need to be a full survey. A few details are enough to get going:
- When you need the work done
- Approximate linear metres or a joint schedule
- Clear photos of the problem areas
- Access details, including height
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to phone 01277 525 020 or email the details over with what you know.
Keeping the joints sound
Once the work is signed off, a little attention goes a long way:
- Keep pressure washers away from fresh sealant
- Don’t wait for a second leak before calling
- Inspect facade joints on a regular cycle
- Confirm the survey covers external sealants in older buildings
If new signage, brackets or services are fixed through a sealed joint, the seal needs making good. Make sure the joint is resealed afterwards.
Coordinate facade sealing with other external works. Sharing the access keeps the cost down.