Construction Mastic in New Southgate
We carry out mastic packages for new-build and refurbishment projects in New Southgate and the surrounding area. Send details for a fixed quote.
- Early adhesion failures on new external joints
- Snag items on joints that need redoing before handover
- Frame gaps too wide for sealant alone
Construction mastic for businesses in New Southgate
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
New Southgate: questions and answers
Can work at a site such as American University in London fit around teaching?
Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Can you work at a site such as Friern Bridge Retail Park, by New Southgate?
Yes. Estates, retail parks and business parks around New Southgate, Friern Bridge Retail Park among them, are all within reach. To start, just call the office on 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
Do you offer coloured sealant?
In many cases, yes. Many products come in a range of standard colours, and matching to RAL references or surrounding finishes is often possible. We confirm what’s available for the specified product when we quote.
Do you take on small jobs?
Small jobs are welcome alongside larger packages. Send details for a fixed quote.
Do you do internal caulk as well as external mastic?
The scope comes from the specification and drawings, but frames, sanitary, kitchens, caulk where specified and snagging are typical.
Do you seal on top of existing sealant?
No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.
Can you fit around our programme?
The programme sets the job. Share the release dates and we will match our work to them, sealing as areas become ready.
How we handle construction mastic in New Southgate
Mastic follows everyone else, which means it absorbs every delay upstream. We agree a sequence at the start and adjust it as the site manager releases areas. That keeps the work right first time and saves rework. If you’re dealing with window and door perimeters that won’t pass inspection and different trades sealing to different standards, we can put it right, whatever the surface. For commercial sealant work in New Southgate, you deal with one contact from quote to sign-off, whether it’s one building or several.
Around New Southgate, as across London, much of the work is refurbishing existing buildings as well as building new ones. 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.
The 12-month guarantee covers our workmanship: the preparation, the sealing and the tooling. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Location
- New Southgate (N11, N10, N14)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Price
- A fixed quote before we start
- Call
- 01277 525 020
- Page updated
- 3 November 2026
What happens if it’s left?
Patching snags as they appear can feel quicker than a proper close-out. A planned sweep of each plot or floor catches the lot in one go, and avoids repeated visits. Snagging can be priced as a separate stage. 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.
Cost follows what’s involved: stripping out, preparation, sealing, access and phasing. Call for a fixed quote.
Why appoint us
- Clear, fixed quotes
- One contact handling all your sites
- Constructionline member
- Standard and matched colours in many product ranges
Take a look at how commercial sealant jobs are priced and how we’re accredited.
When something else is needed
Being straight saves everyone time. New sealant won’t cure:
- Designing joint widths or choosing the specification (that sits with the designer)
- Defective windows, doors or glazing units (the supplier or installer’s job)
- Fire-stopping design or sign-off (that’s for the designer, fire engineer and building control)
If you are not sure, just call the office on 01277 525 020 or email the details over and we’ll give you a straight answer.
Joints and surfaces we work on
- Cladding and panel joints
- Floor and skirting junctions
- Brick and block movement joints
- Window and door perimeters
- Internal decorators’ caulk
- Sanitary and kitchen joints
Also near New Southgate
More services for New Southgate
Facades, frames and programmes in New Southgate
As part of Greater London, New Southgate is inside the ULEZ, which applies to every van on site. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for. New Southgate has a good number of hotels close by, all within 2 miles. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades.
Further education sites such as Oak Hill College (to the north of New Southgate) are extended and refurbished from time to time, with mastic often programmed into the summer break. Hotels like Southgate Hotel London (1.4 miles north-east of New Southgate) rarely close for long, so refurbishment mastic is phased floor by floor.
New Southgate is about 2 miles north-east of Finchley, in Greater London. Anywhere in N11, the process is the same: send details, get a fixed quote, we seal, and the work is guaranteed. New Southgate is one of 764 places we cover in Greater London for mastic packages. For work in that direction, see our London page (8 miles or so).
Business premises anywhere in N11, N10 and N14 are within our area for mastic packages. We cover commercial and managed buildings on High Road, Orion Road and Atlas Road and the roads nearby. Main routes into New Southgate include the A1003 and A1110, useful when we plan access and materials. 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). A short drive away, we cover 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).
Landmarks near New Southgate
We work on buildings around 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). New Southgate has its own railway station: New Southgate station. Well-known places in the area include Grand Arcade (1.5 miles west) and Broomfield House Museum (1.1 miles east). For a walk, there’s Barfield Allotments Nature Park and Highgate Hill.
When to call us in New Southgate
Value-engineered products sometimes end up in the wrong joints. A general-purpose silicone on a facade or a caulk in a wet area won’t perform like the specified product. We stick to the specified product, or put any alternative to you first.
Common reasons buildings call us in:
- A mastic package split between trades with no clear owner
- Perimeter gaps outside the sealant’s range
- Old sealant on a refurbishment that needs stripping before new work
- Cracks opening in caulked internal joints
Units on estates such as Friern Bridge Retail Park (to the south of New Southgate) tend to be reclad and refitted as tenants change, and each job leaves cladding and perimeter joints to seal.
Comparing quotes
- Will failed sealant be removed rather than covered?
- Are they CHAS accredited or on Constructionline?
- Their approach to joint depth and backing
- Whether primer will be used where the manufacturer specifies it
How the quote is worked out
These are the things that shape the price:
- Quantities, in metres or numbers
- Which sealant the job calls for
- Whether the work must be split into stages
- How accessible the joints are
The price depends on how many linear metres there are, how much old material needs removing and the access. Call for a quote once you have the details.
What we need to price the job
Good information means a firmer quote. When you get in touch, include:
- The type of building and who uses it
- Whether an asbestos survey exists
- A wide shot and a close-up of the area
- How the joints are reached, and at what height
Send us photographs, drawings or a joint schedule are often enough for a fixed quote. If the job needs a look first, we’ll arrange a site visit.
Diagnose, treat, sign off
We begin with a short walk round with whoever looks after the building, 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. For a job in New Southgate, 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.
- Drawings, specification and programme come to us.
- Quantities are measured and a fixed price returned.
- The sequence is agreed with the site manager.
- Each area is sealed when it’s released.
- Joints are prepared, backed and sealed to the specification.
- Snags are cleared and the package signed off with our 12-month guarantee.
What we need from you
- Point out parking and an unloading spot
- Warn occupants and staff about the work
- Flag any permit to work we’ll need
Ask for a quote
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, phone 01277 525 020 or email us.
Related advice
Looking after the joints
After handover, a little attention goes a long way:
- Ask for joint and product checks before the package is urgent
- Stick to the specified sealant rather than a generic substitute
- Protect sealed areas from following trades
- Allow flexibility for external sealing in damp or cold weather
If a joint is damaged after sealing, flag it early. Snags can be picked up in a planned close-out visit, priced as part of the package or separately.
Snag items left to the last week put handover at risk. A planned close-out through each area as it completes keeps the list short, and avoids a rush.