Greater London · England
Sand Mastic in Hammersmith
Problem with your window and door surrounds in Hammersmith? We cut out the old, prepare the joints and apply the right sealant.
- Open joints round the window box
- Cement or filler used on old window joints that has cracked
- Draughty sash windows at the surround
Hammersmith: your questions answered
I let a flat near Kensington Olympia station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you cover Hammersmith for sand mastic?
Yes, Hammersmith is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
How long does sand mastic take?
As a guide, most jobs take a few hours for a single window, longer for several. Larger jobs naturally take longer, and we will tell you how long to expect.
Are you insured?
Yes. We’re fully insured.
How do I get a quote for sand mastic in Hammersmith?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Is there any odour?
Possibly a little. It fades as the sealant cures, and ventilation helps.
About our sand mastic in Hammersmith
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. Renewing it closes the gap and tidies the surround. If you’re dealing with cement or filler used on old window joints that has cracked and crumbling sand mastic round a window, we can help.
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 there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Where
- Hammersmith (W6, W14, W12, W4)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Hammersmith
What else we do in Hammersmith
Aftercare tips
Good habits help new joints last longer. Our tips:
- Don’t paint over the new mastic
- Keep sills and gutters clear so water drains away
- Find out about consent before window work on a listed home
- Get any rot dealt with first
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
What happens if it’s left?
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic matches what was there and that can be important for listed homes. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Hammersmith.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Hammersmith
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal sanitary silicone in wet areas
- Homes, businesses and hotels
- A 12-month guarantee on all work
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
How the job changes by surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
Quotes for sand mastic in Hammersmith
Your quote is based on your job. We look at:
- Whether the work is at height
- The number of rooms or windows
- Which sealant suits the joint
- Any working-time requirements on site
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or email us.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Where the job is, and your postcode
- How we’d reach the joints
- Any previous sealing or DIY work
- A few photos by email, if you can
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or send us an email.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Housing providers, facilities teams and property managers book us too in Hammersmith and across Greater London. We can quote a run of properties together, and we are fully insured.
The process
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and clear up. Most jobs take a few hours per window, depending on the condition of the joints. In a London area like Hammersmith, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Clear the area around the work
- Let us know about earlier repairs to the joints
Get a quote
We quote each job on its own. Simply ring 0345 464 0079 or email us and describe the job, and photos are welcome.
Read more
Windows and doors in Hammersmith
With historic houses such as Kelmscott House (about 0.5 miles south-west) nearby, there’s older building stock in the area around Hammersmith 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. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Homes close to Church of the Holy Innocents include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Kensington Olympia station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Hammersmith is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Hammersmith is about 1 mile west of Kensington, in Greater London. Every kind of property in Hammersmith can book us for sand mastic. The work is guaranteed for a year. We cover 764 towns and villages across Greater London, large and small. Our London page covers work nearby (6 miles or so).
Here we cover the W6, W14, W12 and W4 postcode area for sand mastic. You will find streets such as The Square, Ravenscourt Square and Westcroft Square, and we cover them all. If you’re just outside Hammersmith, we cover Brackenbury Village (1 mile north-west), Brook Green (1 mile east), North End (1 mile east), West Kensington (1 mile east) and Old Chiswick (1 mile south-west). We also work in nearby towns such as London (6 miles east), City of Westminster (4 miles east), Marylebone (4 miles north-east), St Pancras (5 miles north-east), Shoreditch (7 miles east) and Walthamstow (11 miles north-east).
Landmarks near Hammersmith
We work in homes and buildings around The Duke of Hammersmith pub, Brook Green and Polish Library POSK in London. Hammersmith’s nearest station is Kensington Olympia station, roughly 0.8 miles east of the centre. Well-known places in the area include West London Hospital (less than half a mile south-east) and Kurdish Museum Library and Archive (within half a mile south-west). Not far away are Campden Hill and WWT London Wetland Centre.