Retaining Wall Reconstruction in Glossop
A stalled project with a single quotation exceeding £40,000. We provided a value-engineered solution, produced an accurate schedule of works, sourced a contractor, and delivered the completed wall for under £15,000 — saving the client over £25,000.
Domestic Client
The project
Two neighbouring period stone properties in Glossop shared a masonry retaining wall running along a narrow ginnel between them. Over time the wall had developed a pronounced lean and was no longer structurally sound. A full demolition and reconstruction were unavoidable.
BEFORE — the failing, leaning stone wall within the narrow ginnel.
A design had already been produced by others: a substantial mass concrete retaining structure, stone-faced, with land drainage and deep foundations. On paper it was a sound engineering solution — but on this site it was heavy, invasive, and expensive. Access was severely restricted; with no vehicular route to the wall, every load of excavated material had to be removed by hand through a private garden, with pathways, steps and the neighbouring property all needing protection throughout.
The original scheme — a mass concrete retaining wall section. Heavy, deep foundations and extensive hand excavation on a tight site.
The practical reality of the scheme was reflected in the pricing. The client had been unable to find a sub-contractor willing to take the works on, and the single quotation they had managed to obtain exceeded £40,000. With no contractor and no affordable route forward, the project had ground to a complete halt.
The Service Provided
Keystone Black were contacted once the project had stalled.
We attended site, reviewed the existing design against the real constraints of the location, and looked for a route that would resolve the engineering problem without the cost and disruption of the original scheme.
Rather than simply re-pricing what was already on the table, we presented the client with two fully considered options:
● Option 1 — construct the retaining wall broadly as originally designed.
● Option 2 — a value-engineered alternative: a stone-faced gabion basket retaining wall.
The gabion solution was the clear fit for the site. It removed almost all of the concrete, reduced the volume of excavation and spoil that had to be carried out by hand, and reused the reclaimed stone from the demolished wall as facing — keeping the finished result sympathetic to the period surroundings while cutting both cost and disruption.
The reclaimed stone from the demolished wall, hand-packed into the gabion baskets — a modern engineered solution with a traditional stone face.
Crucially, we produced a detailed, itemised Schedule of Works. This meant every contractor invited to price was working to identical, clearly defined scope — enabling accurate, transparent, like-for-like tenders rather than the guesswork that had produced the original £40,000+ figure. We then supported the client in sourcing and appointing a suitable contractor to carry out the works.
AFTER — the completed wall, looking down the same ginnel as the first image. Vertical, stone-faced, with new drainage and the alley fully usable again.
AFTER — full elevation of the finished stone-faced gabion wall, with new timber fencing above.
The completed retaining wall was delivered for under £15,000 — a saving of more than £25,000 against the original quotation — with our own involvement charged on a modest, rolling hourly basis. The client paid only for the support they needed to get a stalled, unaffordable project moving and finished to a high standard.
Keystone Black
The Right Solution, Accurately Scoped
A better-suited engineering approach and a detailed schedule of works turned a stalled £40,000+ project into a completed scheme for under £15,000.
Precise scoping is integral to delivery — it removes risk, invites fair competitive pricing, and keeps costs firmly under control.
