Facade and window perimeter sealing in Upper Holloway, Greater London
Facade joint and window perimeter sealing on commercial buildings across Upper Holloway, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Perimeter joints where frames meet the structure
- Sealant pulling away from frames or panels
- New sealant peeling off old mastic
Facade sealing for businesses in Upper Holloway
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
When it isn’t the sealant
Before quoting, we check that sealant is the right answer. It isn’t the answer for:
- Water getting in through cracked render or porous masonry
- Damaged frames that need replacing
- Work on the window or framing system itself
If you are not sure, just speak to us on 01277 525 020 or send details through our quote form and we’ll give you a straight answer.
Surfaces we seal
- Perimeter joints where frames meet the structure
- Cladding panel joints
- Shopfront frames
- Coping and flashing joints
- Stone and brick facade joints
- Window and door perimeters
Facade sealing in Upper Holloway, done properly
External sealing depends on the weather more than most trades. Joints have to be dry and the air and surface temperature within the product’s range, so frosty or damp mornings can hold work back. We plan for that and keep you updated. The enquiries we see most involve perimeter sealant that has split or peeled away and new sealant peeling off old mastic, on stone and brick facade joints, window and door perimeters and shopfront frames. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Upper Holloway, preparation and product choice get the time they need.
Building sites in London tend to be tight: limited storage, booked deliveries and access shared with other trades. Mastic is typically one of the last trades on each elevation or floor, so we keep to the programme and the order of trades the site sets.
What our 12-month guarantee covers is the way we did the job: preparation, application and finish. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Where
- Upper Holloway (N19, N7, N6)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Towns and villages near Upper Holloway
More services for Upper Holloway
Cost factors for facade joints
Quotes vary with the job. Expect it to depend on:
- Specialist products, such as fire-rated or hygienic sealants
- Location, for remote and island sites
- Induction, permit and paperwork requirements
- Access and working height
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.
Details that help us quote
A few photos plus some basic facts will normally do. Please tell us:
- Asbestos survey details if the building is older
- Drawings or a marked-up plan, if available
- Specification clauses that apply
- Anything awkward about access or site hours
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to speak to us on 01277 525 020 or email a schedule or drawings with what you know.
Common problems we fix in Upper Holloway
New sealant run over old sealant rarely holds. Fresh silicone won’t stick to cured silicone.
Typical triggers for a call:
- Unsightly perimeter sealant on a visible elevation
- Cold air coming in at window perimeters
- Leaks at window and door perimeters
- Cladding panel joints that have opened up
Extensions at sites like The Whittington Hospital, less than half a mile north-west of Upper Holloway, normally sit beside working departments, and the mastic follows strict access rules.
What to look for in a quote
- Their plan for phasing and protecting the area
- Do they follow the manufacturer’s priming guidance?
- Will RAMS and insurance details be available?
- The terms of the workmanship guarantee
Why it’s worth doing now in Upper Holloway
Patch repairs over old sealant tend to come back. A full cut-out and fresh bead is the repair that holds, so you aren’t paying for the same joint twice. In Upper Holloway, each extra visit means more notices, permits and disruption, so cutting the old sealant out fully and doing it right once is the better route.
A quote for facade joints depends on how many there are, their condition and the access. Ask us for a fixed quote.
Why clients in Upper Holloway choose us
- Colour agreed before work starts
- Sealing commercial buildings since 2005
- CSCS-carded applicators
- One number for every site we cover
See what affects the cost and our accreditations.
On site: what to expect
At the end of each section, we remove the tape, clean down and inspect every joint with your site contact. If an area should be left alone while the sealant cures, we say how long and put signs out. For a job in Upper Holloway, access comes first. Give us the hours we can be on site and we will schedule to suit.
- First we review photographs, drawings or what we saw on a visit, and agree how each joint will be reached.
- Failed sealant is cut out along its full length.
- Both faces are cleaned and, where the product needs it, primed.
- Backing rod, or bond-breaker tape in shallow joints, limits the depth.
- The new sealant goes in and is tooled firmly onto both faces.
- We walk the finished joints with you before handing over.
Preparing the site
- Agree which areas must stay open
- Arrange parking or a loading space
- Send any specification or drawings in advance
Quotes
For a fixed quote, give us a call on 01277 525 020 or email a schedule or drawings with the site address and an outline of the work. You can also send details through our quote form.
Advice
Your questions answered
Is hospital work, at somewhere like The Whittington Hospital, something you do?
Yes, healthcare and care buildings are part of our work. We follow the site’s permits, sign-in and infection-control procedures in every area.
Can you work in a London building with booked loading and goods-lift slots?
Yes, we plan every London job around the building’s own access rules. Say when the building is occupied and when it’s quiet, and we’ll plan accordingly. We allow for the ULEZ, which covers every borough
Do you hold CHAS accreditation?
Yes. Mastic Doctor is CHAS accredited and a Constructionline member, which helps with supplier vetting.
Can you find out why a window is leaking?
Yes. Photos help, and you can call 01277 525 020 or email a schedule or drawings to arrange a visit. Failed perimeter sealant is a common cause, but not the only one, and we’ll be honest about which it is.
What type of sealant goes on window perimeters?
It depends on the joint, the substrate and any specification. Specifications often refer to BS EN 15651-1 for facade sealants or BS EN 15651-2 for glazing.
Is it okay to overlay old mastic?
No. Fresh silicone won’t grip cured silicone, so the existing bead is removed entirely and the faces are cleaned before resealing. That is what makes the new joint last.
Can you work to our specification?
Yes. Include it with the drawings when you ask for a quote, and we’ll price the work to it.
Sites and facades in and around Upper Holloway
As part of Greater London, Upper Holloway is inside the ULEZ, which applies to every van on site. Add booked deliveries and tight storage, and the mastic package needs planning with the site team. A 2-mile radius around Upper Holloway takes in a good number of hotels. When hotels extend or refit, the work is typically squeezed between peak periods, mastic included.
On a campus such as American University in London, 0.8 miles to the east of Upper Holloway, new teaching buildings and residences are normally built and refurbished around the academic year. Further education sites such as City and Islington College (0.8 miles south-east of Upper Holloway) are extended and refurbished from time to time, with mastic often programmed into the summer break.
Upper Holloway is about 2 miles east of Hampstead, in Greater London. We cover Upper Holloway and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. 764 places across Greater London fall within our area, Upper Holloway among them.
Commercial sites across N19, N7 and N6 are covered. Buildings on Ward Road, Kiver Road and Foxham Road are within our area. You’ll find Upper Holloway on or near the A103, so getting applicators and materials to site is simple. Sites close to Upper Holloway are covered too, including Tufnell Park (1 mile south), Dartmouth Park (1 mile south-west), Highgate (1 mile north-west), Nag's Head (1 mile south-east) and Holloway (1 mile south-east). Bigger towns within reach include London (5 miles south), City of Westminster (4 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Local landmarks in Upper Holloway
Locally, jobs take us to sites close to City of London Academy, Whittington Park and The Mother Red Cap pub, among other places. Other local landmarks include Asanté Academy of Chinese Medicine (1.2 miles north-west) and Vaughan Williams Memorial Library (2 miles south). Upper Holloway has its own railway station: Upper Holloway station. Well-known places in the area include The Mall Wood Green (2.3 miles north-east) and Royal Northern Hospital (0.5 miles south-east). Green spaces nearby include Dartmouth Park Hill and Parkland Walk.
Should maintenance staff do it?
A short, simple internal joint is often within reach of a maintenance team. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Some joints are best left to specialists: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.