Building Control & Inspections UK 2025—The Complete Homeowner’s Guide

When planning any building work in the UK—whether it’s a loft conversion, rear extension, or a full new build—you’ll encounter a key legal requirement: Building Control.

This guide explains exactly what building control is, why inspections matter, how they work in 2025, and what every UK homeowner must do to stay compliant and avoid costly mistakes.

What Is Building Control?

Building Control is the statutory system that checks whether building work complies with UK Building Regulations. Unlike planning permission (which governs what you can build and how it looks), Building Control ensures your project is structurally safe, energy-efficient, accessible, and healthy to live in.

Building control is a legal requirement for most construction work in the UK—from major renovations to new builds and even some internal alterations.

Why Is Building Control So Important?

It Keeps Buildings Safe

Building Control protects occupants by making sure structures can bear loads, resist collapse, and meet fire, ventilation, and drainage standards.

It Enforces Minimum Standards

UK building regulations set minimum standards for:

• Structural stability (Part A)

• Fire safety (Part B)

• Insulation and energy efficiency (Part L)

• Soundproofing (Part E)

• Drainage and waste (Part H)

• Electrical safety (Part P)

• Accessibility (Part M)

It Protects Property Value

If your build doesn’t comply, you risk:

• Enforcement action by your local authority

• Problems when selling or remortgaging

• Having to undo non-compliant work at your own expense

When your work passes final inspection, you get a Building Regulations Completion Certificate—vital proof your project is legally compliant and safe.

Which Projects Need Building Control?

Most common residential works require building control, including:

• Loft conversions

• Rear, side, or wraparound extensions

• Garage or basement conversions

• New builds and self-builds

• Structural changes (e.g., removing a load-bearing wall)

• Roof alterations

• Major electrical or plumbing installations

• Installing new bathrooms or kitchens where drainage is affected

Who Provides Building Control?

You have two main options:

1️⃣ Local Authority Building Control (LABC)
Your local council’s Building Control department inspects your build and issues certificates.

2️⃣ Approved Inspectors
Private building control companies approved by the government. They offer the same checks, often with faster turnaround or more flexible appointments.

How Do Building Control Inspections Work?

When you start a project, you must notify Building Control—either through a Full Plans Application or a Building Notice.

Full Plans Application

• You submit detailed drawings and structural calculations up front.

• Plans are checked for compliance before work begins.

• Ideal for larger or complex projects.

Building Notice

• Simpler, faster option for straightforward residential work.

• No detailed plans are needed in advance, but you risk having to correct work if it fails an inspection.

• Not permitted for new builds or buildings with public access.

Key Inspection Stages

Once your work begins, building control officers or approved inspectors will carry out site visits at key stages. Typical inspection stages include:

1️⃣ Foundation Excavation
Check soil condition, depth, and size of footings.

2️⃣ Foundation Pouring
Ensure correct concrete depth and materials.

3️⃣ Damp Proof Course (DPC)
Check for correct height and damp-proofing method.

4️⃣ Structural Elements
Inspect steel beams, roof structure, floor joists, and load-bearing walls.

5️⃣ Insulation & Fire Safety
Ensure thermal and fire-resistant materials meet standards.

6️⃣ Drainage
Check new pipes, connections, and manholes before backfilling.

7️⃣ Final Completion Inspection
The final sign-off to confirm the building work complies and is safe to occupy.

What Happens If You Don’t Comply?

If you skip inspections or fail to meet building regulations:

• You can face enforcement action, fines, or even court.

• You may be ordered to demolish or redo non-compliant work.

• You’ll struggle to sell your property without a Completion Certificate.

• Insurers may refuse to cover defects or claims.

Who Pays for Building Control?

Fees vary by project size and local authority but are usually

• £300–£800 for simple conversions or extensions.

• £1,000+ for complex builds or multiple inspections.

• Private Approved Inspectors may charge more for extra service flexibility.

These fees cover plan checks, site visits, and final certification.

Do You Need Structural Calculations?

Yes—for any work involving load-bearing changes (e.g., adding RSJs or loft dormers), you’ll need structural calculations from a qualified engineer. These form part of your building control submission.

Building Control in 2025—What’s New?

In 2025, building regulations continue to evolve with a focus on:

• Higher energy standards for new extensions and builds.

• Better ventilation and airtightness to combat dampness and overheating.

• Fire safety upgrades, especially after updated rules for multi-storey homes.

• Digitisation, making submissions and inspection scheduling faster and more transparent.

Final Thoughts

Building control is not just paperwork—it’s your guarantee that your new space is safe, legal, energy-efficient, and future-proof. It protects your family, your neighbours, and your investment.

If you’re planning a loft conversion, rear extension, wraparound, or new build in 2025, make building control a non-negotiable step—not an afterthought. Hire experienced professionals, get your inspections done on time, and keep every certificate. You’ll thank yourself when it’s time to enjoy your new space—or sell your home for maximum value.