Greater London · England
Sand Mastic in Wandsworth
We cover Wandsworth for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Modern sealant on a period surround
How we handle sand mastic in Wandsworth
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Like-for-like sand mastic is often the preferred finish. We work on sash and case windows, stone surrounds and period & listed homes, and the jobs we see most are patchy fillers round a sash window and silicone on a period window that looks wrong.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Location
- Wandsworth (SW18, SW15, SW11)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
FAQs for Wandsworth
Do you work for landlords with property near Wandsworth Town station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit in Wandsworth?
Parking in Wandsworth, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
How long will you be here?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer, and we will tell you how long to expect.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What exactly is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
What guarantee comes with the work?
Our 12-month guarantee applies to all our work.
Also near Wandsworth
Other services in Wandsworth
Landlords, agents and businesses in Wandsworth
We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured.
Landlords and letting agents in Wandsworth can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Sand mastic in Wandsworth: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Fulham Palace (about 1.5 miles north-west) are a reminder that the area around Wandsworth has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as St Anne's CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s. In the older streets around St Anne's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Wandsworth is about 3 miles south-west of Brompton, in Greater London. For sand mastic in and around Wandsworth, it’s easy to get a quote: please ring 0345 464 0079 or email us. We are based in Crawley and cover Greater London. Our area takes in 764 places across Greater London, large and small.
Jobs for sand mastic in SW18, SW15 and SW11 is quoted and booked the same way as anywhere else. That includes homes and businesses on Alma Road, Marl Road and Knoll Road. Other places close to Wandsworth include Southfields (1 mile south), Earlsfield (1 mile south), Hurlingham (1 mile north), Clapham Junction (1 mile north-east) and Battersea (1 mile north-east). We also work in nearby towns such as London (5 miles north-east), City of Westminster (4 miles north), Marylebone (5 miles north-east), Kensington (3 miles north), St Pancras (6 miles north-east) and Shoreditch (7 miles north-east).
Near you in Wandsworth
Locally, jobs take us to homes and businesses close to Ashcroft Technology Academy, Emanuel School and Spread Eagle pub. There’s a railway station in Wandsworth itself: Wandsworth Town station. Other landmarks nearby include Southside Wandsworth (within half a mile west) and Antique Breadboard Museum (1.4 miles north-west). Open spaces near Wandsworth include Battersea Park Lake and Henman Hill.
Leave it or put it right?
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Wandsworth, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll explain what it covers.
What you get with us
- 12-month guarantee on every job
- Anti-fungal silicone where joints get wet
- We leave the area clean and tidy
- Homes, businesses and hotels
Take a look at how sealant jobs are priced or what customers say.
Different surfaces, different methods
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. We rake it out and renew it.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
How it works
Most of a good job is in the preparation, so that’s where we spend the time. 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. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Wandsworth. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Keep pets and children clear of the area while we work
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Ask for a quote
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
Advice
Signs you need sand mastic in Wandsworth
Rain on the window surround works into any crack and loosens it further. Exposed elevations normally fail first.
It’s worth asking for a quote if you see:
- Silicone on a period window that looks wrong
- Draughts and rain around sash boxes
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
As a London address, Wandsworth can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Which colour the sealant will be
- Who does the work, and how experienced they are
- How the surfaces are prepared before sealing
- Are they insured?
What affects the cost of sand mastic
Jobs vary more than people expect. The main factors:
- Whether the work is at height
- Working hours on commercial sites
- Mould in or behind the old joints
- The size of the job
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
You don’t need to know the technical terms. Just tell us:
- Photos by email, if that’s easy
- Any access issues, like height or stairs
- Where the job is, and your postcode
- The problem you’ve noticed
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or drop us an email.