When planning a home extension, understanding planning permission and building regulations is crucial. Getting these right from the start will save you from costly mistakes, project delays, or even legal issues. In this guide, we’ll break down what you need to know to ensure your extension is fully compliant.
What is Planning Permission?
Planning permission is official approval from your local council, allowing you to build, extend, or alter your property. Whether you need it depends on the size, height, and location of your proposed extension.
When Do You Need Planning Permission?
You will need planning permission if:
- The extension is higher than the highest part of your roof.
- It extends beyond the rear wall by more than 3m (for semi-detached/terraced houses) or 4m (for detached houses).
- It covers more than half the land around your home.
- Your property is listed or in a conservation area.
- It includes a balcony, veranda, or raised platform.
💡 Tip: Even if your extension falls within permitted limits, it’s always best to check with your local council to avoid any issues.
What Are Permitted Development Rights?
Permitted Development (PD) rights allow homeowners to extend their property without full planning permission, provided the project meets specific criteria.
✅ Single-storey rear extensions (within size limits)
✅ Loft conversions that don’t exceed height restrictions
✅ Garage conversions that don’t alter the exterior significantly
If your extension meets these conditions, you won’t need to submit a planning application.
How to Apply for Planning Permission
If your extension does require planning permission, follow these steps:
1️⃣ Consult your local planning authority (LPA) – This helps you understand any restrictions in your area.
2️⃣ Hire an architect – A professional can draw up detailed plans that meet council requirements.
3️⃣ Submit your application – This can be done online via the Planning Portal.
4️⃣ Wait for approval – The process typically takes 8-12 weeks.
💰 Planning application cost: Around £200-£500 (varies by location).
Building Regulations: Why They Matter
Even if planning permission isn’t needed, your extension must comply with building regulations. These rules ensure that all construction work is:
✅ Structurally safe – Foundations, walls, and roofs must meet strength standards.
✅ Energy-efficient – Insulation, ventilation, and glazing must comply with regulations.
✅ Fire-safe – Proper escape routes, alarms, and fire-resistant materials must be used.
✅ Electrically sound – Wiring and plumbing must meet safety standards.
How to Get Building Regulations Approval
1️⃣ Submit an application – Your builder or architect will send plans to the local authority or an approved inspector.
2️⃣ Inspections during construction – An inspector will check the work at key stages.
3️⃣ Receive a completion certificate – This proves your extension meets all regulations.
💡 Failing to meet building regulations can result in fines, demolition orders, or issues when selling your home.
Common Mistakes & How to Avoid Them
🚨 Assuming you don’t need permission – Always check with your local council before starting work.
🚨 Ignoring party wall agreements – If your extension affects a shared wall, you need to inform your neighbours.
🚨 Choosing the wrong builder – Poor workmanship could lead to non-compliance.
Final Thoughts: Keep Your Project Compliant
Understanding planning permission and building regulations ensures your extension project runs smoothly. By getting expert advice, following the correct procedures, and working with trusted builders like Kirk Contracts, you can avoid unnecessary delays and costs.
📞 Call us today for expert advice and a FREE consultation!
🌍 Visit our website: www.kirk-contracts.co.uk