PetraCore Developments specialises in domestic building — from stone masonry and home extensions to new builds and landscaping. One trusted team, every trade covered.
PetraCore Developments is a specialist domestic building company led by Jakub Kowalski, with a passion for quality craftsmanship and a personal approach to every project.
We specialise in stone masonry, home extensions, new builds, and landscaping — and because we handle every trade in-house (plumbing, electrics, roofing, plastering and more), you deal with one reliable team from start to finish.
From a single-storey extension to a full new build, we treat every home with the care and precision it deserves — delivering on time, within budget, and with a finish you'll be proud of for years to come.
Every stone laid and every joint finished to the highest standard.
We show up, we communicate, and we deliver what we promise.
Plumbing, electrics, roofing and more — all handled in-house.
Jakub is hands-on throughout every project from day one.
Our signature craft. From natural stone walls and feature facades to garden boundaries and restoration work — built to last and beautiful to look at.
Single-storey, double-storey, side returns and wrap-arounds. We design and build extensions that feel like they were always part of your home.
Full new-build homes from groundwork to final finish. We manage the entire process so you can enjoy the journey of building your dream home.
Patios, driveways, garden walls, steps and planting. We transform outdoor spaces into beautiful, practical extensions of your home.
Fully qualified in-house plumbers and electricians. No subcontracting headaches — all trades coordinated seamlessly under one roof.
Roofing, plastering, tiling, carpentry, rendering and more. Whatever your project needs, our team has the skills to get it done right.
Every project below was built by Jakub and the PetraCore team. No stock photos — just honest craftsmanship.
📍 Snowdonia, Wales
A standalone stone building constructed entirely from Welsh slate in the heart of Snowdonia National Park — walls, flat roof and all finishing completed by PetraCore.
📍 Yorkshire Moors
A full dry stone compound enclosure built on open moorland — perimeter walling, gate post setting and gravel groundworks across a large rural site.
📍 West Yorkshire
A large-scale private estate featuring dry stone boundary walling with dressed coping, curved feature walls, herringbone brick pathways, flagstone terracing, formal gardens and large retaining walls. A true showcase of PetraCore's range.
📍 Peak District
A curved dry stone garden wall wrapping the frontage of a traditional stone cottage — built to complement the property's character and create a charming planted border.
📍 Yorkshire Dales
Complete barn conversion including dry stone walling, traditional stone roof, full repointing, landscaped courtyard, stone lintels and window alterations — every element handled in-house.
📍 West Yorkshire
A purpose-built stone cabin with traditional slate roof, dressed quoins and cast iron guttering — constructed to house electrical infrastructure while blending beautifully into the landscape.
Jakub rebuilt our garden boundary wall in natural stone — the craftsmanship is superb. He was reliable, tidy and kept us informed every step of the way. Would absolutely use PetraCore again.
We had a single-storey extension built by PetraCore. Jakub handled everything — from the foundations and stonework right through to the plumbing and electrics. Brilliant quality and a pleasure to deal with.
Jakub repointed our cottage and rebuilt a collapsed section of dry stone wall at the front. The finish blends perfectly with the original stonework. Excellent attention to detail — highly recommended.
Ready to start your project? Call or message Jakub directly for a free, no-obligation quote. We cover all domestic building work — no job too big or too small.