Greater London · England
Sand mastic for sash & case windows in Nash, Greater London
Window and door surrounds in Nash need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Failed mastic on an exposed elevation
- Tired mastic found when preparing windows for paint
- Old cement repairs round a window that have failed
About our sand mastic in Nash
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. Typical jobs include a silicone bead on a sash window that spoils the look and mastic round period door frames that has failed, across timber door frames, period & listed homes and stone surrounds.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
Whatever the size of the job, it’s backed by our 12-month guarantee in Nash and across Greater London.
- Place
- Nash (BR2)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Nash
Is Nash in your area for sand mastic?
Yes. We work across London and the South East, and Nash is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Is parking a problem for a job in Nash?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can I add another job to the visit?
Of course. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
Can old silicone round a sash window be swapped for sand mastic?
Yes. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Is the work guaranteed?
Our 12-month guarantee applies to all our work.
Towns and villages near Nash
Other services in Nash
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Sashes that need overhauling
- Whether work needs listed building consent
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Sash and case windows
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Stone surrounds
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to a full day, depending on how many windows. For a job in Nash, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- 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
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will take it from there.
Advice
Windows and doors in Nash
With historic houses such as Down House (about 2.4 miles south-east) nearby, there’s older building stock in the area around Nash 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’s traditional sand mastic. 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.
For site and facilities teams at buildings such as Wickham Common Primary School, the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Hayes (Kent) station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Nash is about 3 miles south of Bromley, in Greater London. Across the BR2 area, we can carry out sand mastic at your property. Nash is one of 764 towns and villages in Greater London where we work. You can also see our page for London, about 11 miles away.
We cover every part of BR2 for sand mastic. We cover properties on Nash Lane and North Pole Lane and the roads around them. Other places close to Nash include Keston (1 mile east), Leaves Green (1 mile south-east), Hayes (1 mile north), New Addington (2 miles south-west) and Farthing Street (2 miles south-east). Larger places within reach include London (11 miles north-west), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (14 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north).
Near you in Nash
Locally, jobs take us to homes and businesses close to The Greyhound pub, All Saints Catholic School and Coney Hall Recreation Ground. Nash’s nearest station is Hayes (Kent) station, roughly 1.4 miles north of the centre. Nearby you’ll also find The Mall (3.2 miles north) and Bethlem Museum of the Mind (1.8 miles north). The countryside around Nash includes Hutchinson's Bank and Summer Hill.
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you’re set on DIY, put the effort into 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.
How the job changes by surface
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
What affects the cost of sand mastic
Every job gets its own quote. These are the things that affect it:
- Whether there’s mould to deal with
- Any working-time requirements on site
- Access and height
- The number of rooms or windows
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- The problem you’ve noticed
- A few photos by email, if you can
- The type of property
- Access, such as stairs, a lift or height
We quote each job on its own, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details, and pictures are welcome.
Landlords, agents and businesses in Nash
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Do you need sand mastic in Nash?
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
These are the problems we’re asked about most:
- Old cement repairs round a window that have failed
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Weathered mastic on the most exposed windows
If you live in an older home near Keston Parish Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before booking anyone
- How long to leave it before use
- Which colour the sealant will be
- What guarantee comes with the work
- What preparation is included