Tips for Your Home Extension

Practical advice from Chartered Structural Engineer Mike Byfield to help your extension run smoothly and avoid costly surprises.

Extending your home is a major project, but careful preparation and the right professional advice make all the difference. The tips below outline some of the most important points to consider before you begin.

1. Structural Design and Site Visits

Some engineers charge extra for site visits or for revising drawings when problems arise on site. At Romsey Structural Engineering Ltd, all work is quoted at a fixed price — including site visits and any necessary design revisions. You’ll know the full cost upfront, and your design will include all the details needed for steelwork and fabrication, avoiding surprises later.

2. Use Local Authority Building Control

It’s usually best to use your Local Authority Building Control service for inspections rather than a private inspector chosen by your builder. Local Authority inspectors are independent and typically offer more consistent, impartial assessments throughout the build.

3. Understand the Different Types of Drawings

There are two main kinds of architectural drawings, and each serves a specific purpose:

• Planning Drawings – Used to obtain planning permission.
• Building Regulations Drawings – Contain detailed construction information and are submitted for Building Control approval.

Building Regulations drawings ensure you know exactly what is being built, allow Building Control to approve the design before work starts, and make it easier to obtain comparable quotes from different builders — because everyone is pricing the same specification.

4. Don’t Skip Detailed Drawings

Some homeowners try to save on fees by building directly from planning drawings. This often leads to problems: unclear specifications, quality issues, and disputes during construction. Detailed Building Regulations drawings set clear standards for materials and workmanship, helping to ensure your extension is built correctly.

5. Architect Fees and Drawing Quality

Architects vary widely in both fees and the level of detail they provide. The best drawings include full specifications — even down to light fittings and extractor fans — so builders can price the job accurately. Less-detailed drawings can result in missing items and unexpected extra costs during the build.

By planning carefully and working with experienced professionals, you’ll avoid common pitfalls and achieve a smoother, higher-quality result for your home extension.