Greater London · England
Sand mastic for sash & case windows in New Southgate, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for New Southgate, backed by a one-year guarantee. Call for a quick quote.
- Failed mastic on an exposed elevation
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
How we handle sand mastic in New Southgate
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. We work on period & listed homes, timber door frames and tenement windows, and people most often call us about gaps round a timber door in stone or brick and patchy fillers round a sash window.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in New Southgate as anywhere.
Our work is backed for twelve months, in New Southgate and everywhere else we cover.
- Location
- New Southgate (N11, N10, N14)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
Landlords and agents in New Southgate can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for.
For anyone letting property in or around New Southgate, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
What happens on the day
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes anything from a few hours to a full day, depending on how many windows in most cases. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in New Southgate. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
- Let us know about earlier repairs to the joints
Get a quote
For sand mastic in New Southgate, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Keep sills and gutters clear so water drains away
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
- Find out about consent before window work on a listed home
Leave the new mastic unpainted, as traditional guidance advises. If you’re redecorating, ask us first.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Surface by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
Period and listed homes
A traditional finish suits a period property.
Your questions about sand mastic in New Southgate
Is New Southgate in your area for sand mastic?
Yes. We work across London and the South East, and New Southgate is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Can you help a landlord with a rental near New Southgate station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Do you guarantee sand mastic work?
All our work has a 12-month guarantee, and we are fully insured.
Can you quote for more than one area?
Yes. More than one area can be quoted together.
What information do you need?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Are you insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
When will the new mastic be hard?
Not straight away. It skins first and hardens fully later, and we’ll tell you what to expect.
How much does sand mastic cost in New Southgate?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Also near New Southgate
Also in New Southgate
Leave it or put it right?
Draughts round a sash window are not always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in New Southgate, the repair is bigger than a sealant job.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- Trusted Arbo and Everbuild sealants
- Experience in homes, commercial sites and hotels
- Rated 4.9 stars on Google
What sand mastic looks like in New Southgate
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near New Southgate station, cracked sand mastic around sash windows lets in the draughts tenants complain about. 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. As a London address, New Southgate can be tricky for parking: let us know about parking bays, permits or a driveway.
New Southgate is about 2 miles north-east of Finchley, in Greater London. Our applicators cover sand mastic for householders, landlords and businesses in New Southgate, as part of our work across Greater London. Across Greater London, we cover 764 places, and New Southgate is one of them. There’s also a page for London, roughly 8 miles from New Southgate.
Jobs for sand mastic in N11, N10 and N14 is quoted and booked the same way as anywhere else. Local streets include High Road, Orion Road and Atlas Road, all of which we cover. You will find New Southgate on the A1003 and A1110, which makes it straightforward to reach with everything needed for sand mastic. Neighbouring places we cover for sand mastic 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 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).
What’s near New Southgate
Around New Southgate, our work takes us to homes and buildings near Friern Barnet School, Ming-Ai and The Ranelagh pub, among other places. You’ll also find 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). Green spaces nearby include Barfield Allotments Nature Park and Highgate Hill.
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
What affects the cost of sand mastic
The quote reflects the job in front of us. We take into account:
- Any working-time requirements on site
- Whether the work is at height
- How many areas need sealing
- Mould in or behind the old joints
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- The type of property
- How we’d reach the joints
- Whether it has been sealed before
- Pictures of the joints, sent by email
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.