Grinding out the old grout
Before any new pointing could go in, all the old grout was fully ground out of the joints across the whole patio, so the new mortar bonds properly instead of sitting on top of failing joints.
Case study · Wimbledon SW19 · March 2026
Yorkstone patio repointing and cleaning in Wimbledon
Robert's Yorkstone patio in Wimbledon, around 60m², had dirty, stained slabs and tired joints. In three days we ground out all the old grout and repointed it the traditional way in a 3:1 sand and cement mix, jet washed the stone and treated it with professional products to remove the black spots and algae. We also jet washed the decking around the pool and did a little garden tidying. £5,000 including VAT.
- Location
- Wimbledon, SW19
- Client
- Robert
- Price
- £5,000 inc. VAT
- Time on site
- 3 days
- Patio
- Yorkstone, around 60m²
- Pointing
- Ground out, 3:1 sand & cement
Where we started
The brief
Robert's home in Wimbledon has around 60m² of Yorkstone patio running along the house and round to a circular seating area, plus a swimming pool with timber decking. Over the years the slabs had become stained with black spots and algae, and the old grout between them had worn.
The stone itself was sound, so it did not need replacing. It needed a deep clean and new pointing to bring it back. It is a good example of the patio repairs in Wimbledon and patio cleaning in Wimbledon we carry out.
Before & after
The same patio, before and after
The tricky parts
What went into it
Step by step
How we built it
Grinding out the old grout
All the old grout was ground out of the joints across the 60m² patio.
Jet washing and treating the stone
The Yorkstone was jet washed, then treated with professional products to remove the black spots, algae and green staining.
Jet washing the stained Yorkstone 
Cleaning the circular Yorkstone patio Repointing in 3:1 sand and cement
All the joints were repointed by hand in a traditional 3:1 sand and cement mix.
Newly repointed Yorkstone patio by the back doors 
Fresh sand and cement pointing between the slabs Pool decking and garden tidy
The decking around the pool was jet washed and the garden was given a light tidy.
Jet washed timber decking around the pool 
The tidied garden and lawn
The finished work
The restored patio
Budget
What it cost
This job came to £5,000 including VAT over three days, covering grinding out the old grout across around 60m² of Yorkstone, full traditional repointing in 3:1 sand and cement, jet washing, professional treatment for black spots and algae, jet washing the pool decking and a light garden tidy. That is roughly £83 per m², a fraction of the cost of replacing the patio. See our patio repairs in Wimbledon page for more options.
Get a free quote- Price
- £5,000 inc. VAT
- Time on site
- 3 days
- Patio
- Yorkstone, around 60m²
Questions
About patio repointing and cleaning
Thinking about something similar? These are the questions we hear most.
How much does patio repointing and cleaning cost in Wimbledon?
Robert's 60m² Yorkstone patio in Wimbledon SW19 came to £5,000 including VAT over three days: grinding out the old grout, repointing in 3:1 sand and cement, jet washing and black spot treatment, plus the pool decking and a light garden tidy. That is roughly £83 per m².
What are the black spots on my patio?
They are usually lichen, which grows into the surface of the stone. A jet wash alone will not remove them; they need treating with a specialist product.
What is 3:1 sand and cement pointing?
It is a traditional mortar of three parts sand to one part cement, pressed firmly into the joints by hand. It sets hard, keeps weeds out and suits natural stone patios.
Why grind out the old grout before repointing?
New mortar needs a clean, deep joint to bond to. Grinding out the old, cracked grout first means the new pointing is solid and lasts, instead of flaking off a thin layer on top.
Can Yorkstone be cleaned and repointed?
Yes. Yorkstone is a durable natural stone, so an old Yorkstone patio can usually be restored with careful cleaning and new pointing rather than replaced.
Is it worth repointing an old patio instead of replacing it?
If the slabs are sound and level, yes. Cleaning and repointing brings a stone patio back for a fraction of the cost of new paving.
Can you clean decking as well?
Yes. We jet washed the decking around Robert's pool at the same time as the patio.
Do you restore patios near Wimbledon?
Yes, including Wimbledon Village, Putney and Raynes Park. See all our landscaping in Wimbledon.
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020 3633 5529 info@finelandscape.co.ukFine Landscape Ltd
31 Tylecroft Road, Norbury, London SW16 4BL
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