Greater London · England
Sand Mastic in Mortlake
Our applicators work in Mortlake on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- A silicone bead on a sash window that spoils the look
- Draughty sash windows at the surround
- Gaps where the frame meets the masonry
Sand mastic in Mortlake, done properly
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. Common call-outs are for draughty sash windows at the surround and gaps where the frame meets the masonry, on tenement windows, period & listed homes and stone surrounds.
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.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Where
- Mortlake (SW14, SW13, SW15)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Sort the mastic before the decorators arrive
- Look over the window mastic once a year
- Ask the planning authority about consent for listed or conservation-area homes
- Ask a joiner to look at soft timber first
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Mortlake homes and the weather
Historic houses like Chiswick House (about 1.3 miles north) are a reminder that the area around Mortlake 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. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
If you let a flat or house near Mortlake station, older sash windows in a rental need their mastic kept sound to keep the weather out. In the older streets around All Saints' Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
Mortlake is about 3 miles west of Fulham, in Greater London. Homes, rented property, offices and hotels in Mortlake can book us for sand mastic. The work is guaranteed for a year. Across Greater London, we cover 764 places, Mortlake among them. Our London page covers work nearby, about 8 miles away.
Every address in SW14, SW13 and SW15 is covered for sand mastic. We cover properties on Elm Road, Well Lane and Coval Road. With the A3003 close by, Mortlake is easy for our applicators to reach. Other places close to Mortlake include East Sheen (1 mile south-west), North Sheen (1 mile north-west), Barnes (1 mile north-east), Grove Park (1 mile north) and Roehampton (1 mile south-east). Larger places within reach include London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles north-east).
What’s near Mortlake
In Mortlake, that means homes and buildings near Richmond Park Academy, Hare and Hounds pub and Palewell Park and the streets around them. Mortlake has its own railway station: Mortlake station. Other landmarks nearby include Ubuntu Museum: African Museum of Humanity (1.1 miles south-east) and Barnes Hospital (within half a mile east). Open spaces near Mortlake include Richmond Hill and Kew Gardens Lake.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes a few hours per window, depending on the condition of the joints, including the tidy-up. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Nearby places to Mortlake
More services for Mortlake
Why it’s worth doing now in Mortlake
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Mortlake, the repair is bigger than the sealant job would have been.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Mortlake
- Every job guaranteed for a year
- Old sealant always removed completely
- We leave the area clean and tidy
- Quality sealants from Arbo and Everbuild
What we can’t put right
To be straight with you, there are a few things sealant will not fix:
- Decisions on consent for listed homes
- Putty and glazing repairs
- Decayed frames that need repair
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before booking.
Where we work in Mortlake
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Tenement windows
- Brick reveals
- Timber door frames
Common problems we fix in Mortlake
Most of it is simply age. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
Most people get in touch after spotting something like this:
- Patchy fillers round a sash window
- Mastic that needs renewing before redecorating
- Silicone on a period window that looks wrong
- Weathered mastic on the most exposed windows
For site and facilities teams at buildings such as Thomson House School, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Whether they’re fully insured
- Which sealant they’ll use, and why
- Whether you can choose the colour
- Is VAT in the price?
Questions from Mortlake
Can you do sand mastic in Mortlake?
Yes, Mortlake is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Can parking be tricky for a visit in Mortlake?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
How long does sand mastic take?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer.
Is consent needed for window work on a listed home?
Check with your local planning authority. They decide whether consent is needed for work to your windows.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will advise.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
What affects the quote in Mortlake
You will get a clear quote before work begins. It takes into account:
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- How much old sealant there is and how hard it is to remove
- The number and length of the joints
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
To make quoting easier, let us know:
- The rough size of the job
- Pictures of the joints, sent by email
- Where the property is
- Any previous sealing or DIY work
To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear quote before any work starts.
Landlord and commercial work in Mortlake
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.