Facade Sealing in Underhill
Work needed on a facade joint in Underhill? We look at it, seal it with the right product and hand it over with a 12-month guarantee.
- Leaks at window and door perimeters
- Patch repairs that keep failing
- Hard, chalky sealant that no longer flexes
Facade sealing across Underhill
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
How we handle facade sealing in Underhill
Most facade joint failures trace back to the joint, not just the sealant. The width has to suit the expected movement and the sealant’s movement capability, and closed-cell rod sets the depth, keeping the bond to two faces. The enquiries we see most involve cladding panel joints that have opened up and sealant pulling away from frames or panels, across window and door perimeters, coping and flashing joints and stone and brick facade joints. For commercial sealant work in Underhill, you deal with one contact from quote to sign-off, for single jobs and planned programmes alike.
Construction in a London area such as Underhill means working on constrained sites: 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.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Where
- Underhill (EN5, N20)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Underhill: questions and answers
Do you work in London buildings with loading restrictions?
Yes. Inductions, permits and timed loading are routine for us in London. Send the building rules and access times with your enquiry.
Do you cover business parks and estates near Underhill, such as Hadley Manor Trading Estate?
Yes. Our area takes in Underhill and its surroundings, with estates and business parks such as Hadley Manor Trading Estate included. To start, just call the office on 01277 525 020 or email a schedule or drawings with the unit, the joints involved and your access times.
Is old mastic on our building likely to contain asbestos?
In older non-domestic buildings, old sealant can contain asbestos. Check the asbestos register or survey before it is disturbed. Removal of asbestos isn’t something we do.
Will rain stop the work?
Rain and frost can pause external sealing. The programme allows for it and we tell you if the forecast changes things throughout the job.
Do you hold CHAS accreditation?
Yes. CHAS accredited, Constructionline member, and our applicators hold CSCS cards.
When can the area be used after sealing?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, so we’ll confirm the curing time on the day.
Can you find out why a window is leaking?
Yes. We look at the perimeter sealant and tell you whether it has failed before quoting. If the water seems to come from a roof, sill or the glazing unit instead, we say so.
How a job runs
A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself typically takes anything from a single day to several weeks, depending on joint lengths, access and the weather, and we clear our waste as we work. For a job in Underhill, access comes first: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Send the building rules and access times with your enquiry.
- Access, site rules and timing are settled with the client up front.
- Weather and temperature are checked against the product’s limits.
- We remove the old bead and check the edges are sound.
- 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.
Getting the site ready
- Point out any areas we must not close
- Share the asbestos register for older buildings
- Explain the parking and delivery arrangements
Quotes
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, call 01277 525 020 or use the quote form.
Related advice
New build and refits around Underhill
As part of Greater London, Underhill is inside the ULEZ, which applies to every van on site. Deliveries are booked and storage is tight, so mastic materials come in as needed. Several hotels sit less than 2 miles from Underhill. When hotels extend or refit, the work is typically squeezed between peak periods, mastic included.
Further education sites such as Oak Hill College, 2.1 miles east of Underhill, are extended and refurbished from time to time, with mastic often programmed into the summer break. When units on a site such as Hadley Manor Trading Estate (0.5 miles north of Underhill) are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.
Underhill is about 1 mile west of Barnet, in Greater London. Any commercial site in Underhill is covered, whether it’s a single job or part of a planned programme. Our Greater London coverage takes in 764 places. London is covered too, some 11 miles away.
We take on facade joints across the EN5 and N20 postcode area, whatever the building. For a building on Park Road, May's Lane and Manor Road or nearby, we can quote for facade joints. Sites close to Underhill are covered too, including Barnet (1 mile east), New Barnet (1 mile east), Monken Hadley (1 mile north), Hadley Wood (1 mile north-east) and Cockfosters (2 miles east). Further afield, our area takes in London (11 miles south-east), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (9 miles south) and Shoreditch (10 miles south-east).
Local landmarks in Underhill
Recent enquiries here include premises near Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub, among other places. The nearest railway station is New Barnet station, roughly 1 mile east. Well-known places in the area include Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). Open spaces near Underhill include Greenhill Gardens and Darland's Lake.
Leave it or put it right?
A few metres of new sealant compare well with replacing ceilings, linings or damaged stock. Water through a failed joint rarely stays where it starts. In a London building, a failed joint rarely affects only one party. Dealing with it early is simpler for everyone.
Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits.
What you get with us
- Specification-led, product-correct work
- 12-month guarantee on workmanship
- Clear, fixed quotes
- Old sealant cut out, never sealed over
Take a look at how commercial sealant jobs are priced and how we’re accredited.
Building owners, agents and FMs in Underhill
For main contractors, we work as the sealant subcontractor. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.
Hospitality, education, healthcare, office and retail clients book us directly too. The work is planned around how the building runs, so the building keeps working while we do.
Places near Underhill
Other services in Underhill
How the quote is worked out
Each job is priced on its own details. The things that drive the figure:
- Whether the work must be split into stages
- Access and working height
- How much existing material needs removing
- Site requirements such as inductions and permits
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 you’ll have a fixed figure to work with.
Details that help us quote
The more we know, the firmer the quote. Helpful details to send:
- How the joints are reached, and at what height
- Specification clauses that apply
- Where the site is, with the postcode
- The asbestos register, for older buildings
Let us know the site, the scope and your timescale, and we will put a fixed quote together. To get it moving, ring 01277 525 020 or send details through our quote form.
Signs you need facade sealing in Underhill
Product choice matters: an acetoxy cure can mark stone or corrode some metals, and interior products break down outdoors. Neutral-cure, facade-grade products are what most external joints need.
Things that typically lead to an enquiry:
- Failed seals around shopfront and entrance frames
- Patch repairs that keep failing
- Hard, chalky sealant that no longer flexes
- Water coming in around window frames
Hotel extensions and refits, at places such as The Barrington Hotel (less than half a mile east of Underhill), usually run between busy periods, so the sealing is squeezed into short windows.
What your quote should include
- Will CSCS-carded applicators be on site?
- Their public liability cover
- Health and safety accreditation such as CHAS
- Will RAMS and insurance details be available?
When it isn’t the sealant
Some faults sit outside our scope, and we point that out rather than sealing over them:
- Installing or repairing glazing systems
- Providing access systems for the work
- Damp caused by condensation inside the building
If you are not sure, just call 01277 525 020 or send photos by email and we will give you a straight answer.
Joints and surfaces we work on
- Cladding panel joints
- Window and door perimeters
- Shopfront frames
- Coping and flashing joints
- Perimeter joints where frames meet the structure
- Stone and brick facade joints