House Extension Builder Norfolk

House Extension Builders

Home Extensions

Transform your home with the expertise of JNR Building in expanding living spaces. Our house extension services are designed to breathe new life into your property, adding room and value that perfectly complement your needs. Whether you’re looking to create a spacious open plan, a new living room, a home office, or any other extension, we’ll work closely with you to ensure the result aligns with your vision and enhances your quality of life.

Types Of House Extension

Many kinds of extensions could be suitable for your home extension project. The type of extension we recommend will depend on what you’d like to gain from your extension as well as the shape/structure of your house.

Single Storey

From £1250-£1500/m².

A single-storey house extension is one of the most common types of house extension. It offers flexibility in design and is perfect for creating open living spaces.
Double Storey

From £1750-£2000/m².

A double-storey extension provides additional space on both levels of your home, making it ideal for expanding your living area and adding bedrooms or bathrooms.

From £1250-£1500/m².

A rear extension extends your home into your garden, creating extra room and enhancing the connection between your indoor and outdoor spaces.
Side Return

From £1250-£1500/m².

Side return extensions are often added to Victorian and Georgian-era properties, expanding the width of your home and transforming small spaces into functional areas.
L-Shape Wrap Around

From £1250-£1500/m².

These extensions combine side and rear extensions to wrap around your property, offering versatile space for period and detached homes.
Over Structure

From £1750-£2000/m².

Suitable for homes with garages or single-storey extensions, over-structure extensions create additional double-storey space, adding value to your property.


From £1750-£2000/m².

Dormer extensions offer a space-efficient solution for expanding your home’s living areas or adding extra bedrooms. By extending vertically from the existing roofline, these extensions create additional headroom and floor space.

Other extensions may refer to garage conversions, barn conversions, or loft conversions. Read more about domestic conversions.

Home Extension Process

The process of building a home extension is the same for every project, no matter the size or complexity. We start by understanding exactly what is required and through a set of carefully designed steps we arrive at your dream extension built exactly as you wished for.

Step 1:

We begin with a consultation to understand your vision and requirements for your house extension project. Your input is essential to ensure the extension aligns with your lifestyle.

Step 2:
Design & Planning

Our team collaborates with you to design and plan the extension, focusing on your preferences and functional needs. We provide expert guidance on materials, layouts, and design elements.

Step 3:

Once the design is finalised, we move to the construction phase. Our skilled craftsmen and project management team ensure that the extension is built to the highest standards.

Step 4:
Quality Assurance

Quality is paramount in our work. We conduct regular inspections throughout the construction process to guarantee that the extension meets your expectations and industry standards.

Step 5:
Completion & Handover

Upon finishing the construction, a final inspection ensures everything is in order. We then hand over the completed extension, ready for you to enjoy and make it a seamless part of your home.


Got questions about the extension build process? Extending a home can be daunting so we’ve answered frequently asked questions to demystify the extension build process.

The duration of a house extension project varies based on its size and complexity. We provide estimated timelines during the planning phase.

The cost depends on factors like size, design, materials, and location. We work with you to create a budget that aligns with your project requirements.

As a general rule of thumb, here are some average prices for home extensions:

Single storey extension: £1250-£1500/m².

Double storey extension: £1750-£2000/m².

Porch: £8000 – £12000.

Landscaping: £100/m².

Absolutely! We encourage your input and collaborate closely with you to ensure the extension reflects your preferences and style.
Yes, we manage the process of obtaining the necessary permits and approvals to ensure your house extension complies with local regulations.
JNR Building offers a personalised, high-quality service, expert project management, and a commitment to excellence. We’re dedicated to enhancing your living space.

Get a free quote

For a free, transparent quote contact Julian and the JNR Building team today.