Greater London · England
Sand Mastic in Norwood New Town
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Norwood New Town. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Failed mastic on an exposed elevation
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
Sand mastic in Norwood New Town
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. We work on brick reveals, timber door frames and period & listed homes, and people most often call us about crumbling sand mastic round a window and window mastic to renew ahead of painting.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Norwood New Town (SE19, SE27, SE21)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
How we quote for sand mastic
There’s no set price list, because no two jobs are the same. What we look at:
- The type of sealant required
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
What to tell us for a quote
When you call or email, it’s useful to know:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
- If someone has resealed it before
- The address or postcode of the job
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
What the job involves on each surface
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Leave the new mastic unpainted
- Renew mastic before redecorating the windows
- Ask a joiner to look at soft timber first
- Make sure water runs off the sill
Do not touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
How it works
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to a full day, depending on how many windows. In Norwood New Town, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Advice
What sand mastic looks like in Norwood New Town
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
If you live in an older home near New Covenant Church-Equipping People, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Norwood New Town can be tricky for parking: let us know about parking bays, permits or a driveway. Letting a property close to Gipsy Hill station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Norwood New Town is about 4 miles south of Stockwell, in Greater London. Jobs in Norwood New Town get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 764 places across Greater London.
Postcode districts we cover here for sand mastic: SE19, SE27 and SE21. If you need sand mastic at a property on Dover Road, Moore Road and Gipsy Road or anywhere close by, our applicators can take on the job. Norwood New Town is on the A214, so it’s easy for us to get to with everything needed for sand mastic. If you are just outside Norwood New Town, we cover Upper Norwood (1 mile east), Gipsy Hill (1 mile north-east), West Norwood (1 mile north), Crystal Palace (1 mile east) and West Dulwich (1 mile north). Larger places within reach include London (5 miles north), City of Westminster (7 miles north), Marylebone (7 miles north), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Landmarks near Norwood New Town
Typical jobs here are in homes near Hillcrest, Virgo Fidelis Convent Senior School and The Sparrowhawk pub. The nearest railway station is Gipsy Hill station, roughly 0.5 miles north-east. Well-known places in the area include Whitgift Centre (3.1 miles south) and Crystal Palace Museum (0.7 miles east). Green spaces nearby include Battersea Park Lake and Dulwich Upper Wood.
Towns and villages near Norwood New Town
Other services in Norwood New Town
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Norwood New Town questions
Is parking a problem for a job in Norwood New Town?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Can you do sand mastic in Norwood New Town?
Yes, Norwood New Town is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Do you work for landlords and businesses?
Yes, often. Several properties can go on one quote.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Where is Mr Mastic based?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Broken panes
- Timber that has rotted
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before you book.
What we seal
- Brick reveals
- Period & listed homes
- Sash and case windows
- Timber door frames
- Tenement windows
- Stone surrounds