Facade and window perimeter sealing in Greenhill, Greater London
We carry out facade joint and window perimeter sealing on commercial buildings in Greenhill. Send details for a fixed quote.
- Gaps between rainscreen or cladding panels
- Patch repairs that keep failing
- Perimeter joints where frames meet the structure
Facade sealing for Greenhill sites
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Signs you need facade sealing in Greenhill
Adhesive failure, where the sealant peels away from one face, usually comes from poor preparation. Dust, old sealant residue, damp or a missing primer stop it bonding properly, and movement soon pulls it away.
What tends to prompt an enquiry:
- Damp patches beside frames after rain
- Staining on stone next to old sealant
- Perimeter sealant that has split or peeled away
- Cold air coming in at window perimeters
Further education sites such as Working Men’s College (to the east of Greenhill) are extended and refurbished from time to time, with mastic often programmed into the summer break.
Questions to ask before you book
- Will CSCS-carded applicators be on site?
- What the guarantee covers, and for how long
- How they’ll work around occupants
- Whether primer will be used where the manufacturer specifies it
About our facade sealing in Greenhill
We are often asked to look at water coming in around frames. Failed perimeter sealant is a frequent cause. We’ll tell you if we think the leak is coming from somewhere sealant won’t fix. If you have water coming in around window frames and failed sealant on precast panel joints, we can put it right, on window and door perimeters, perimeter joints where frames meet the structure and cladding panel joints alike. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Greenhill, preparation and product choice get the time they need.
The ULEZ covers the whole of Greater London, so contractors’ vehicles on a job in Greenhill must meet its standards or pay the daily charge. Alongside that, sites usually need booked deliveries and a plan for where materials go.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.
- Place
- Greenhill (NW3, NW6)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Price
- Quoted before any work starts
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
After the work
To get the most from the new sealant:
- Avoid harsh cleaners on facade sealant
- Plan facade sealing alongside redecoration
- Avoid patch repairs on failed facade joints
- Confirm the survey covers external sealants in older buildings
Hold back any cleaning crew until the joints have had their stated cure time. Keep high-pressure jets and strong chemicals away from new sealant.
Don’t wait for a full elevation to fail. Small repairs stop small leaks becoming large ones inside the building.
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.
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.
Greenhill: questions and answers
Will you take on work at estates like Regis Road Business Park, close to Greenhill?
Yes. Estates, retail parks and business parks around Greenhill, Regis Road Business Park among them, are all within reach. A few photos and the unit address let us price the work.
Do you take on work at healthcare sites like Royal Free Hospital?
Yes, hospitals are one of the sectors we cover. Work is phased so departments keep running, under the site’s own rules.
Will you come and look before quoting?
It depends on the job. Straightforward work can often be priced from photos and measurements, while larger or less clear jobs get a site visit first.
What about RAMS and site documents?
Requirements differ from site to site, so tell us what you need and we’ll confirm it when we quote.
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.
Will your applicators have CSCS cards?
Yes. We use CSCS-carded applicators.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Cost factors for facade joints
There’s no standard rate for sealant work, because every site is different. What we take into account:
- Working within restricted access windows
- Whether old sealant has to be cut out first
- Joint width, depth and condition
- The product specified
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.
Before you send an enquiry
Whether it’s one area or a whole building, the same details help:
- Any specification or named product
- Whether the building will be occupied during the work
- Anything awkward about access or site hours
- When you need the work done
Photos, drawings or a schedule of the joints and a fixed quote comes back to you. If the job needs a look first, we will arrange a site visit.
How a job runs
The first thing on site is a walk round with your contact, to confirm the scope, the order of work and any areas we must keep clear. Then we strip out anything that has failed, prepare every joint and seal it. All of Greater London is in the ULEZ, and kerbside space in Greenhill can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- We plan access and the order of elevations with the client.
- 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.
Preparing the site
- Agree which areas must stay open
- Clear stock, furniture or equipment away from the joints
- Send asbestos survey details if the building is pre-2000
Get a fixed quote
Quotes are fixed against the scope you send, so the cost is agreed before work starts. To start the process, call the office on 01277 525 020 or email the details over.
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What we can’t put right
Honesty saves time and money. New sealant won’t cure:
- Joints too narrow for the movement they take, which need redesign
- Installing or repairing glazing systems
- Damaged frames that need replacing
Not sure which it is? You can ring 01277 525 020 or email drawings and photos and we will tell you honestly before you book.
Where we work in Greenhill
- Cladding panel joints
- Perimeter joints where frames meet the structure
- Stone and brick facade joints
- Window and door perimeters
- Coping and flashing joints
- Shopfront frames
Towns and villages near Greenhill
More services for Greenhill
Sites and facades in and around Greenhill
There are plenty of hotels within about 2 miles of Greenhill. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades. The ULEZ covers the whole of Greater London, Greenhill included, so site vehicles need to meet its standards or pay the daily charge. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for.
Hotel extensions and refits, at places such as Quality Hotel Hampstead, under half a mile south-west of Greenhill, normally run between busy periods, so the sealing is squeezed into short windows. Building work at universities like Regent's University London, 2.2 miles south-east of Greenhill, is often timed for the summer, mastic included.
Greenhill is about 1 mile north-east of Hampstead, in Greater London. Our applicators travel to Greenhill for work on facade joints, handled exactly as we handle every other area. 764 places across Greater London fall within our area, including Greenhill.
We take on facade joints across the NW3 and NW6 postcode area, for business premises of every kind. Buildings on Back Lane, Well Road and Ornan Road are within our area. Just outside Greenhill, we also work in Hampstead (1 mile south-west), Vale of Health (1 mile north), West Hampstead (1 mile west), Fortune Green (1 mile west) and Haverstock (1 mile south-east). Further afield, our area takes in London (5 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east).
Local landmarks in Greenhill
Locally, jobs take us to sites close to Cecil Sharp House, Fitzjohn's Primary School and King William IV Public House. Other local landmarks include South Hampstead High School (0.6 miles south) and Hampstead Heath (0.7 miles north-east). Greenhill has its own railway station: Hampstead Heath station. A little further out are New End Hospital (under half a mile north-west) and Montfichet's Tower (4.3 miles south-east). Green spaces nearby include Belsize Wood and Parliament Hill.