Many homeowners focus on planning permission when they start thinking about an extension — but building regulations are just as important, and apply to almost every building project regardless of whether you needed planning permission. Here’s what you need to know.

What Are Building Regulations?

Building regulations are a set of minimum standards for the design, construction, and alteration of buildings in England. They cover structural stability, fire safety, energy efficiency, drainage, ventilation, and more. While planning permission is about whether a building can be built (its size, position, and impact on the area), building regulations are about how it must be built.

The regulations are administered locally — in Leeds, by Leeds City Council Building Control, or by an approved private inspector.

Do I Always Need Building Regulations for an Extension?

Almost always, yes. Building regulations apply to:

• All new extensions, regardless of size
• Loft conversions
• Garage conversions to habitable rooms
• Structural alterations (removing walls, creating new openings)
• New bathrooms or en suites
• Electrical works beyond like-for-like replacement

Minor works like replacing like-for-like windows, doors, or roofing materials don’t usually need building regulations approval, but there are exceptions — particularly for energy performance (Part L) compliance.

Full Plans vs Building Notice

There are two main routes to building regulations approval:

Full Plans submission: You submit detailed construction drawings to Building Control before work starts. They check the drawings for compliance and issue an approval notice. This is the approach YPDS recommends because it gives your contractor clear, approved drawings to build from, reduces the risk of costly changes on site, and protects you if queries arise later.

Building Notice: You notify Building Control that work is starting (without submitting drawings) and they inspect during construction. This is quicker to set up but riskier — if an inspector finds non-compliance on site, remedial work can be expensive.

YPDS produces Full Plans construction drawings from £800 inc. VAT for single storey extensions.

What Do Building Regulations Construction Drawings Include?

Our building regulations drawings package typically includes:

• Fully dimensioned floor plans and elevations
• Section drawings showing structural details, insulation, and foundation depths
• Roof construction details
• Window and door schedules
• Notes referencing compliance with relevant Approved Documents

For projects requiring structural engineering (e.g. steel beams, large spans), we coordinate with a structural engineer whose calculations are submitted alongside the drawings.

Leeds City Council Building Control Fees (2026)

Building control fees vary by project type and value. For a typical single storey rear extension, Leeds City Council charges approximately:

• Plan charge: £200–£350 (paid on Full Plans submission)
• Inspection charge: £300–£550 (paid before or during construction)

Private approved inspectors offer an alternative and are sometimes faster, though fees are broadly similar.

Structural Requirements for Extensions

All extensions must be structurally stable — foundations must be adequate for the ground conditions (variable across Leeds, from clay in the south to rock in the north), walls must transfer loads safely, and roofs must be designed to carry wind and snow loads. A structural engineer’s input is often needed for flat roofs, large spans, or where existing walls are being removed.

Energy Efficiency (Part L)

New extensions must meet current energy efficiency standards under Part L of the Building Regulations. This means properly insulated walls, roofs, and floors, and glazing that meets current U-value requirements. For larger extensions, a SAP (Standard Assessment Procedure) calculation may be required to demonstrate overall dwelling compliance.

How YPDS Helps

Our construction drawings service produces everything you need for a Full Plans submission to building control. We draw in detail, coordinate with your structural engineer, and ensure your drawings meet current Approved Documents requirements. Get a free quote today — fixed fees, no surprises.