Greater London · England
Window Mastic in New Southgate
Window mastic for New Southgate and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- A bead that does not match the frame
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
Window mastic for homes and businesses in New Southgate
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty. Where the air is getting in through the window itself, we will say so. Common call-outs are for mastic that’s falling out in pieces and cracked sealant at the sill ends, on composite doors, patio & French doors and timber windows & doors.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in New Southgate.
All our work is covered by our 12-month guarantee.
- Location
- New Southgate (N11, N10, N14)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We’ll tell you which suits your home.
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it.
New Southgate: your questions answered
Can you do window mastic in New Southgate?
Yes. We work across London and the South East, and New Southgate is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Can parking be tricky for a visit in New Southgate?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Is the work guaranteed?
Yes, for 12 months. A yearly look at the joints helps them last.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can you reach windows above the ground floor?
Normally, yes. We plan safe access before the job, so mention the height and anything in the way.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Also near New Southgate
More services for New Southgate
How it works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for a few frames, or a day or more for a whole house, including the tidy-up. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
- Mention any leaks or damp you’ve noticed
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved and give you a clear quote.
Related advice
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What window mastic looks like in New Southgate
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
If you let a flat or house near New Southgate station, renewing tired window mastic between tenants heads off draught and damp complaints. Homes close to St Paul's Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in. Schools such as St Paul's CofE Primary School N11 are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
New Southgate is about 2 miles north-east of Finchley, in Greater London. Across the N11 area, our applicators can take on window mastic. Across Greater London, we cover 764 places, New Southgate among them. There’s also a page for London, roughly 8 miles from New Southgate.
Here we cover the N11, N10 and N14 postcode area for window mastic. If you need window mastic at a property on High Road, Orion Road and Atlas Road or anywhere close by, we can help. New Southgate is on the A1003 and A1110, which makes it straightforward to reach. If you’re just outside New Southgate, we cover 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 out, we also 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 in homes and buildings around Friern Barnet School, Ming-Ai and The Ranelagh pub, among other places. Nearby too are 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. A little further out are Grand Arcade (1.5 miles west) and Broomfield House Museum (1.1 miles east). Open spaces near New Southgate include Barfield Allotments Nature Park and Highgate Hill.
Landlord and commercial work in New Southgate
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Keeping the joints in good condition
Looking after new joints is easy:
- Clear any debris from frame drain holes
- Keep solvents and bleach off the sealant
- Clean frames with a soft cloth and soapy water
- Avoid blasting the frames with a pressure washer
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Honest limits
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Broken hinges, locks or handles
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Composite doors
- uPVC windows
- Aluminium frames
- Patio & French doors
- Window sills
- Timber windows & doors
Quotes for window mastic in New Southgate
You’ll get a clear quote before work begins. It takes into account:
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- Any mould that needs treating
- The number and length of the joints
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
When you call or email, it’s useful to know:
- Whether it’s a home or a business
- What’s wrong with the joints now
- Any access issues, like height or stairs
- Where the job is, and your postcode
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or send us an email and describe the job, and photos are welcome.