Greater London · England
Sand Mastic in Bexley
Window and door surrounds in Bexley need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Mastic that needs renewing before redecorating
About our sand mastic in Bexley
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. Typical jobs include a silicone bead on a sash window that spoils the look and old sand mastic that has cracked, crumbled or fallen out, across period & listed homes, brick reveals and tenement windows.
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.
Whatever the size of the job, you get the same 12-month guarantee in Bexley and across Greater London.
- Location
- Bexley (DA5, DA6, DA14, DA1)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in Bexley
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
Any of these means the joints need attention:
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
- Mastic that needs renewing before redecorating
For an older house near a landmark such as Parish Church of St John the Evangelist, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- How the surfaces are prepared before sealing
- Is VAT in the price?
- What insurance they hold
- When the joint can take water or movement
Different surfaces, different methods
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
What we do, step by step
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for a single window, longer for several. 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 look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
Ask for a quote
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job.
Related advice
What sand mastic looks like in Bexley
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. 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.
Letting a property close to Bexley station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Schools such as Old Bexley Church of England School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Bexley is about 3 miles east of Eltham, in Greater London. Bexley gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Across Greater London, we cover 764 places, and Bexley is one of them. You can also see our page for London, roughly 11 miles from Bexley.
Here we cover the DA5, DA6, DA14 and DA1 postcode area for sand mastic. Whether your property is on Bexley High Street, Camden Road and The North Glade or a nearby road, we can help. You will find Bexley on the A2018 and B2210, which makes it straightforward to reach. If you are just outside Bexley, we cover Blendon (1 mile north-west), North Cray (1 mile south), Bexleyheath (1 mile north), Upton (1 mile north) and Coldblow (1 mile east). Larger places within reach include London (11 miles west), City of Westminster (13 miles west), Marylebone (13 miles north-west), Kensington (15 miles west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Landmarks near Bexley
Around Bexley, our work takes us to homes and buildings near St Columba's Catholic Boys' School, Danson Park and Townley Grammar School, among other places. The nearest railway station is Bexley station, roughly 0.6 miles east of the centre. Other landmarks nearby include Broadway Shopping Centre (1 mile north-east) and Bexley Museum (1.1 miles east). The countryside around Bexley includes Summer Hill and Wansunt Pit.
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Common questions in Bexley
Do you cover Bexley for sand mastic?
Yes. Our work covers London and the South East, and Bexley is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Can parking be tricky for a visit in Bexley?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Should I use sand mastic or silicone?
We will talk it through with you. Sand mastic suits many period homes, and modern sealants suit newer frames.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic can sit properly.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we are using and why.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or email us.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Plan mastic work ahead of painting
- Do not paint over the new mastic
- Check with your local planning authority if your home is listed
- Avoid patching sand mastic with silicone
Avoid painting over the new mastic, which is the traditional advice. If you are redecorating, ask us first.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sash cords, weights and draught-proofing of the sashes
- Decisions on consent for listed homes
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Tenement windows
- Timber door frames
- Period & listed homes
- Sash and case windows
- Brick reveals
- Stone surrounds
Towns and villages near Bexley
More services for Bexley
Quotes for sand mastic in Bexley
Your quote is based on your job. We look at:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- The size of the job
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
Asking for a quote
When you contact us, it’s useful to know:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- If someone has resealed it before
Getting a quote is simple: let us know what needs doing and where and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.