Facade Sealing in New Southgate
Facade joint and window perimeter sealing on commercial buildings in New Southgate and across Greater London. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Water coming in around window frames
- Patch repairs that keep failing
- Facade joints cracked through the middle
Facade sealing across New Southgate
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Facade sealing in New Southgate, done properly
We don’t install glazing systems or replace glass. What we seal are the joints around them: perimeter joints where frames meet the structure, panel joints and window perimeters, using sealants classified for facade or glazing use. We work on perimeter joints where frames meet the structure, window and door perimeters and cladding panel joints, and what we are called in for most is water coming in around window frames and previous reseals run over old sealant. Looking for mastic applicators who cover New Southgate? Mastic Doctor has worked for contractors, FMs and building owners since 2005, CHAS accredited and a Constructionline member.
A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building, so tidy, well-planned work matters.
Building owners and contractors get the same cover: a 12-month guarantee on our workmanship. It doesn’t extend to damage, faults in the building or work by others, and we’re upfront about that.
- Location
- New Southgate (N11, N10, N14)
- Region
- Greater London
- Cover
- 12 months on every job
- Quote
- Quoted before any work starts
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Common questions from New Southgate clients
Can you work in a London building with booked loading and goods-lift slots?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Say when the building is occupied and when it’s quiet, and we will plan accordingly. All of Greater London is inside the ULEZ, and our planning allows for it
Will you plan work around the academic year at somewhere like American University in London?
Yes, holiday working periods are the norm on campus jobs. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
Do you take on small jobs?
Whatever the size, the process is the same: send details, get a fixed quote, we seal, guaranteed.
Do you work to architects’ specifications?
Yes. Send it with your enquiry, and the quote will be based on it, flagging anything that needs clarifying.
Can you find out why a window is leaking?
Yes. Photos are often enough to start, followed by a visit if needed. Failed perimeter sealant is a common cause, but not the only one, and we’ll tell you which.
Do we need an asbestos check before resealing?
For older buildings, yes, check before work starts. The duty to manage asbestos sits with the dutyholder. If asbestos is suspected, work stops until it is tested.
Do you replace windows or glass?
No. A glazing contractor handles that. What we seal are the joints around frames and panels on commercial buildings.
Work for main contractors and building owners
We work for building owners and managing agents on everything from one building to a spread of sites. Several sites can go on one quote, so there’s one set of paperwork to deal with.
Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm with the quote.
Surface by surface
Brick and stone facades
On masonry, the sealant has to suit a porous, textured surface. Neutral-cure products are used because acetoxy types can mark some stone.
Perimeter joints at frames and structure
Where framed systems such as shopfronts meet the building structure, there is a perimeter joint to seal. Our work is that perimeter joint, not the framing or glazing itself.
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, so the real damage is often some distance away. In a London building, a failed joint rarely affects only one party: water travels through shared structures, and a small leak becomes a dispute between occupiers. Dealing with it early is simpler for everyone.
The work involved drives the cost: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a fixed quote and we will explain how it’s made up.
Why appoint us
- Coloured sealants to suit the setting, where available
- Work to your specification and the manufacturer’s guidance
- Constructionline member for supplier checks
- Colours confirmed for the specified product
Read how commercial sealant jobs are priced or how we’re accredited.
Contractors’ notes for New Southgate
Every borough of Greater London is inside the ULEZ, and that applies to contractors’ vehicles on any job in New Southgate. Delivery slots and scarce storage shape how and when the mastic goes in. A 2-mile radius around New Southgate takes in a good number of hotels. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up.
For contractors at a college like Oak Hill College, 1.8 miles north of New Southgate, perimeters and internal sealant are timed for the holidays. Work at a hotel such as Southgate Hotel London, 1.4 miles north-east of New Southgate, tends to be programmed around bookings, mastic included. New units and refits on sites such as Friern Bridge Retail Park, under half a mile south of New Southgate, need their panel and perimeter joints sealed to the specification.
New Southgate is about 2 miles north-east of Finchley, in Greater London. Any commercial site in New Southgate is covered. 764 places across Greater London fall within our area, including New Southgate. London is covered too, around 8 miles from New Southgate.
Commercial sites across N11, N10 and N14 are covered. Buildings on High Road, Orion Road and Atlas Road are within our area. Access to New Southgate is via the A1003 and A1110, so getting applicators and materials to site is simple. Nearby places we also cover include Friern Barnet (1 mile west), Arnos Grove (1 mile east), Bounds Green (1 mile south-east), Brunswick Park (1 mile north) and Southgate (1 mile north). Further afield, our area takes in London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (6 miles south) and Shoreditch (7 miles south-east).
Local landmarks in New Southgate
Around New Southgate, our work takes us to commercial buildings near Friern Barnet School, Ming-Ai and The Ranelagh pub. Other local landmarks include O. R. Tambo Recreation Ground (0.9 miles south-east) and Francis Skaryna Belarusian Library and Museum (1.8 miles west). There’s a railway station in New Southgate itself: New Southgate station. Well-known places in the area include Grand Arcade (1.5 miles west) and Broomfield House Museum (1.1 miles east). The countryside around New Southgate includes Barfield Allotments Nature Park and Highgate Hill.
Places near New Southgate
What else we do in New Southgate
Looking after the joints
Every sealant joint needs some looking after, and their life depends on movement, exposure, cleaning and use. We suggest:
- Walk the elevations once or twice a year
- Plan facade sealing alongside redecoration
- Never let anyone seal over old sealant
- Keep pressure washers away from fresh sealant
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, so brief your window cleaners.
Coordinate facade sealing with other external works. Sharing the access keeps the cost down.
On site: what to expect
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Joint faces are cleaned back to sound, dry surfaces, primer goes on where the manufacturer specifies it, and each bead is tooled to a neat concave finish. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- We look at the joints, the drawings and the access before pricing.
- 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.
What we need from you
- Warn occupants and staff about the work
- Flag any permit to work we will need
- Agree which areas must stay open
Request a quote
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, give us a call on 01277 525 020 or email us.
Related advice
When to bring in a specialist
There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and our CSCS-carded applicators are used to working under those rules.
Putting right a botched joint often costs more than sealing it well at the start, since all of it has to come out and the faces be cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.