Greater London · England
Sand Mastic in Nunhead
Sand mastic for Nunhead and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Draughts and rain around sash boxes
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The amount of work
- Any mould that needs treating
- Working hours on commercial sites
- Access and height
Doing several joints on one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear price for the lot.
What we need to know
When you call or email, it’s useful to know:
- What’s wrong with the joints now
- Where the property is
- Photos by email, if that’s easy
- Whether it’s a home or a business
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
Sand mastic for homes and businesses in Nunhead
Silicone on a period window often looks wrong and is not always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. If you have old sand mastic that has cracked, crumbled or fallen out and failed mastic on an exposed elevation, we can help.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Nunhead.
You’re covered for a year from the day we finish. If anything isn’t right with it, phone 0345 464 0079 or email us.
- Place
- Nunhead (SE15, SE4, SE14)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
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.
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, and the work is guaranteed for a year.
What the job involves on each surface
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
Stone surrounds
Old stone surrounds are often uneven, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
How the visit works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. It normally takes a few hours for a single window, longer for several. In Nunhead, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at the surrounds with you and agree the joints to renew.
- 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.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
- Tell us about any water getting in
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or email us.
Read more
Nearby places to Nunhead
Also in Nunhead
Aftercare tips
Good habits help new joints last longer. A few tips:
- Look over the window mastic once a year
- Find out about consent before window work on a listed home
- Do not paint over the new mastic
- Get any rot dealt with first
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Nunhead: your questions answered
Is parking an issue for sand mastic in Nunhead?
Parking in Nunhead, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
I let a flat near Nunhead station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Where are you based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
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.
How long does the job take?
That depends on the amount of work, but as a guide it takes a few hours per window, depending on the condition of the joints. We’ll tell you when we quote.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
What happens if it’s left?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and blends with the stone or brick. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Nunhead.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Why Nunhead clients choose us
- More than 20 years in sealant work
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
- One-year guarantee on every job
Take a look at our cost guide or our reviews.
What sand mastic looks like in Nunhead
London and the South East are among 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 Queen's House (about 2.4 miles north-east) nearby, there’s older building stock in the area around Nunhead as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Ivydale Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Nunhead station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Nunhead is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Nunhead is about 1 mile south-west of New Cross, in Greater London. We provide sand mastic to homes and businesses in Nunhead. We cover 764 towns and villages across Greater London, large and small.
Postcode districts we cover here for sand mastic: SE15, SE4 and SE14. We cover properties on Rye Road, Nash Road and Kitto Road. We also cover the places around Nunhead: Telegraph Hill (1 mile north-east), Honor Oak (1 mile south), Peckham (1 mile north-west), New Cross (1 mile north-east) and Brockley (1 mile south-east). Further out, we also cover London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles west), St Pancras (5 miles north-west) and Shoreditch (5 miles north).
Near you in Nunhead
Typical jobs here are in homes near The Ivy House, Peckham Rye and Allenby Tutorial Trust. There’s a railway station in Nunhead itself: Nunhead station. A little further out are Greenwich Castle (2.4 miles north-east) and Lewisham Shopping Centre (1.7 miles east). For a walk, there’s Knight's Hill and One Tree Hill.
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for.