Maintaining a Grade II* Listed Building – Restoring Y Felin in St Dogmaels with Lime

Standing proudly beside the historic ruins of St Dogmaels Abbey, Y Felin (Welsh for The Mill) is one of the last working water mills in Wales still producing traditional stoneground flour. Dating back to the 12th century, this remarkable Grade II* listed building is not only an important part of Welsh heritage but also a wonderful example of sustainable living, powered entirely by water.

When local lime specialist Jud from Just in Lime collected NHL 2 Lime from our Cardigan warehouse for a repointing project at Y Felin, we couldn't wait to hear more about the work. We caught up with second-generation miller Emma Hall to learn about the history of the mill, the restoration work, and why lime continues to play such an important role in preserving this unique building.

Bringing a Historic Water Mill Back to Life

Although Y Felin dates back to the 12th century, it stopped operating in the 1920s and gradually fell into disrepair.

Everything changed in 1981 when Emma's father, Mike Hall, undertook the enormous task of restoring the mill to full working order.

The restoration involved far more than simply repairing the building. The mill pond had to be excavated once again, a suitable water wheel sourced, timber structures rebuilt, and the original machinery and millstones carefully restored to working condition.

More than forty years later, the mill continues to operate much as it always has.

Emma returned home in 2018 to learn the traditional milling process from her father and now proudly continues the family tradition, producing stoneground flour using nothing more than the power of the water wheel.

The result is flour that retains all of the natural goodness of the grain while being produced using entirely renewable energy.

Just as importantly, Emma works closely with a small number of British family farms, ensuring every batch of grain meets the exceptional quality expected from Y Felin.

Caring for a Grade II* Listed Building

Maintaining a building that has stood for centuries requires careful thought and sympathetic materials.

When the time came to repair the external masonry, Emma turned to local lime specialist Jud from Just in Lime.

Before any work began, Jud carefully assessed the building and recommended a traditional lime mortar that would both protect the historic stonework and preserve the character of the mill.

One of the biggest challenges with any heritage restoration project is ensuring that repairs blend seamlessly with the original building. Jud carefully matched the existing mortar colour, helping the new pointing sit naturally alongside centuries of history.

The work was also planned so that milling could continue uninterrupted, allowing Y Felin to remain fully operational throughout the restoration.

Emma described the results perfectly:

"Working with Jud and his team was a joy. He matched the original colour of the mortar so beautifully that the mill looks as though it has always been this way.

Jud had previously lime rendered the lower floor of the mill, and it genuinely felt like new life had been breathed back into the building. Once the front had been lime pointed, the natural beauty of the stonework simply shone through."

Why NHL 2 Lime Was the Right Choice

For historic buildings like Y Felin, choosing the correct mortar is every bit as important as the workmanship itself.

Traditional stone buildings were designed to breathe. Unlike modern cement mortars, which can trap moisture inside walls, Natural Hydraulic Lime (NHL 2) allows moisture to move naturally through the building fabric.

This breathability helps reduce damp problems while allowing the stonework to expand and contract naturally with seasonal changes, making NHL 2 particularly suitable for older, softer masonry.

The finished pointing not only looks authentic but also helps protect the building for many years to come.

Looking to the Future

The restoration work doesn't stop there.

Emma hopes to continue improving the mill over time, with plans to gradually lime render more of the interior as funding allows.

For a Grade II* listed building, every repair is another step towards preserving an important piece of Welsh history for future generations.

Preserving Heritage with Traditional Materials

Projects like Y Felin remind us why traditional lime products remain just as relevant today as they were hundreds of years ago.

Whether you're repairing a listed building, restoring an old cottage or simply maintaining a historic property, choosing breathable materials that work in harmony with the original building is one of the most important decisions you can make.

At Celtic Sustainables, we're proud to supply a wide range of natural lime products for heritage restoration projects across the UK. If you're unsure which lime mortar, render or plaster is right for your project, our team is always happy to offer practical advice based on real experience.

A huge thank you to Emma Hall and Jud from Just in Lime for sharing the story of Y Felin and allowing us to feature their wonderful restoration work.

If you're ever visiting the Cardigan area, Y Felin is well worth a visit. Emma runs guided tours of the working mill, and you can even take home some of its beautiful traditional stoneground flour.