Greater London · England
Sand mastic for sash & case windows in Upper Norwood, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Upper Norwood. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Patchy fillers round a sash window
- Tired mastic found when preparing windows for paint
- Open joints round the window box
The process
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. 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.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work before giving you a price.
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Sand mastic in Upper Norwood
Traditional burnt sand mastic that sits naturally against stone and brick. It’s a good fit for period properties where a modern sealant bead would stand out. We work on brick reveals, tenement windows and timber door frames, and people most often call us about silicone on a period window that looks wrong and wind and rain getting in round a sash window.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Upper Norwood is something to talk through when you book.
All our work is covered by a one-year guarantee, wherever you are in Greater London.
- Where
- Upper Norwood (SE19, SE27, SE21)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
A few problems are outside what sealant work can do:
- Decayed frames that need repair
- Planning or listed building consent (your local planning authority decides)
- Sashes that need overhauling
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
What we seal
- Timber door frames
- Stone surrounds
- Brick reveals
- Sash and case windows
- Period & listed homes
- Tenement windows
Common problems we fix in Upper Norwood
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
Keep an eye out for these signs:
- Window mastic to renew ahead of painting
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
If you let a flat or house near Gipsy Hill station, any sash windows need sound mastic to keep draughts and rain out.
What to look for in a quote
- Whether they’re fully insured
- What preparation is included
- Who does the work, and how experienced they are
- Whether VAT is included
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Find out about consent before window work on a listed home
- Inspect the joints round the windows every year or so
- Ask us before painting near the mastic
- Avoid heavy scraping on the mastic joint
Don’t touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Places near Upper Norwood
Also in Upper Norwood
Windows and doors in Upper Norwood
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Kingswood House (about 0.8 miles north) nearby, there’s older building stock in the area around Upper Norwood as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Homes close to Christ Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. As a London address, Upper Norwood can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Upper Norwood is about 4 miles south-east of Stockwell, in Greater London. We carry out sand mastic for homes and businesses in Upper Norwood and nearby. Upper Norwood is one of 764 places in Greater London where we work. For nearby work, see our London page.
Our applicators cover all of SE19, SE27 and SE21 for sand mastic and the streets around it. If you need sand mastic at a property on Dover Road, Hawke Road and Tudor Road or a nearby road, our applicators can take on the job. Main roads around Upper Norwood include the A214, so getting to you is simple. We also cover the places around Upper Norwood: Norwood New Town (1 mile west), Gipsy Hill (1 mile north-east), West Norwood (1 mile north-west), Crystal Palace (1 mile east) and Anerley (1 mile east). Further out, we also cover London (6 miles north), City of Westminster (7 miles north-west), Marylebone (7 miles north), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Local landmarks in Upper Norwood
Typical jobs here are in homes near The Sparrowhawk pub, Long Meadow and Rockmount Primary School, among other places. There’s a railway station in Upper Norwood itself: Gipsy Hill station. Nearby you will also find St Christopher's Hospice (1.3 miles east) and Crystal Palace Museum (0.5 miles east). Green spaces nearby include Dulwich Upper Wood and Knight's Hill.
FAQs for Upper Norwood
Is parking an issue for sand mastic in Upper Norwood?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is Upper Norwood in your area for sand mastic?
Yes. Our work covers London and the South East, and Upper Norwood is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Are you insured?
Yes. Full insurance covers our work.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and finished to sit neatly against the masonry.
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
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
We quote each job individually. This is what makes a difference:
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- How many rooms, windows or areas are involved
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and give you a clear price before work begins.
What we need to know
To make quoting easier, please include:
- The type of property
- Where the job is, and your postcode
- A few pictures by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Work for landlords, hotels and businesses
If you manage several properties in or around Upper Norwood, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.