When planning a home extension, renovation, loft conversion, or new build, two phrases often come up: planning permission and building regulations approval.
They are closely linked, but they are not the same thing. In simple terms, planning permission looks at the principle and impact of your project, while building regulations focus on how the work is designed and built safely.
Some projects need both. Others may only need one. Getting clear on the difference early can help avoid delays, extra costs, and problems later in the process.
Planning permission is concerned with the effect your proposed development may have on the surrounding area.
Your local planning authority will usually consider things such as:
Planning permission may be needed if you want to build something new, make a major change to a building, or change the use of a building.
That said, not every project needs a full planning application. Some works can be carried out under Permitted Development Rights, as long as they meet specific rules. These rights can also be affected by property type, location, and restrictions such as conservation areas or listed status.
Building regulations are different. They deal with the technical performance, safety, and quality of the building work.
This includes areas such as:
Building regulations approval helps confirm that the work complies with the required standards. This usually involves technical drawings, construction details, specifications, structural calculations, and other supporting information for building control.
So, while planning may approve the appearance and principle of an extension, building regulations make sure it is structurally sound, safe, and suitable to use.
In many cases, yes.
For example, a large rear extension may need planning permission because of its size and impact on neighbouring properties. It will also need building regulations approval because it involves foundations, walls, insulation, structural openings, electrics, drainage, and roof construction.
Some smaller internal alterations may not need planning permission but could still require building regulations approval, especially if structural walls, fire safety, or drainage are affected.
A common mistake is assuming that because planning permission is not required, no other approvals are needed. That is not always the case.
In most cases, planning comes first.
The usual route is:
Once planning is complete, the design usually needs further technical development before it is ready for building control. This can include detailed construction drawings, engineering calculations, insulation details, drainage information, and specifications.
If you carry out work without the planning permission you need, the local authority can take enforcement action. In some cases, this may mean changing or removing completed work.
If building regulations approval is missed, issues can appear later when selling the property, dealing with insurers, or trying to regularise the work. Missing approvals can also create uncertainty around safety, compliance, and build quality.
Planning permission and building regulations approval serve different purposes, but both help make sure your project is suitable, safe, and legally compliant.
The best approach is to check what your project needs at the start. Western Building Consultants can advise on planning permission, permitted development, technical drawings, building regulations approval, and the wider design process.
From small home alterations to larger residential projects, getting the right advice early can make the whole process much smoother. If you’re planning a project and are unsure which approvals you need, get in touch with Western Building Consultants today for clear, practical advice before work begins.