How much does an extension cost in Buckinghamshire, Hertfordshire and surrounding arears – Structural pricing guide only

Wondering how much a home extension costs in Buckinghamshire, Hertfordshire, or nearby areas? At Urban & Rural Construction, we’ve created a clear and transparent structural extension pricing guide to help you budget for your project with confidence. Our prices focus on the core structural work only—from foundations and walls to roofing and standard windows—delivered wind- and watertight and ready for follow-on work. This gives you a realistic idea of starting costs before adding bespoke finishes, kitchens, bathrooms, or interior details.

What’s included in our extension costs?

Our structural pricing covers:

  • Foundations & groundworks
  • External & internal walls
  • Roof structure & finish
  • Structural steelwork
  • Standard windows & external doors

This gives you a watertight, enclosed shell that’s ready for follow-on work such as plumbing, electrics, insulation, plastering, and internal finishes.

What’s NOT included – And why it’s important

We want to be clear: our prices do not include internal fit-out or finishing costs. These vary hugely depending on your choices, property type, and the professionals you hire.

Factors that influence internal costs include:

  • Kitchen/bathroom fitting
  • Electrics, heating & plumbing
  • Interior finishes & bespoke joinery
  • Planning & architectural services

Because of the many personal, design, and site-specific variables, it’s impossible to give an accurate total cost without a full survey and scope. Quoting inclusive figures without this information would be misleading and unrealistic.

Home extension cost estimates – Structural work only

Here’s a general guide to help you understand the starting cost of typical extensions. All prices are based on standard build specifications and include a wind- and water-tight structure only.

Extension Size Estimated Cost (Structural Only)
Small (6m x 3m) £48,000 – £67,000
Medium (7m x 3m) £56,000 – £71,000
Large/Wrap £60,000 – £93,000+

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💬 Let’s Build Something Great Together
At Urban & Rural Construction, we don’t just build extensions, we build trust, comfort, and long-term value into every home.

Ready to turn your kitchen into the space you’ve always dreamed of, then let’s create the space your home deserves by completing our online enquiry form below to book a free consultation and quote. We’re happy to discuss your ideas and guide you through the process.

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    Examples of extension costs.

    All estimated prices is for structural, simple steels, windows, doors and screeded floor.

    For more information please contact us on freephone number 0800 644 6114 or email info@urbanandruralconstruction.co.uk.

    Large Rear Flat Roof Extension

    Structural Work Only Starting At:

    £64,000.oo

    Small Rear Flat Roof Extension

    Structural Work Only Starting At

    £48,000.oo

    Medium Rear Flat Roof Extension

    Structural Work Only Startin At:

    £56,000.oo

    Large Rear Pitch Roof Extension

    Structural Work Only Starting At:

    £64,000.oo

    Small Rear Pitch Roof Extension

    Structural Work Only Starting At:

    £52,000.oo

    Medium Rear Pitch Roof Extension

    Structural Work Only Starting At:

    £61,000.oo

    Large Rear Pitch Roof Extension

    Structural Work Only Starting At:

    £71,000.oo

    Small Rear Pitch Roof Extension

    Structural Work Only Starting At:

    £52,000.oo

    Medium Rear Pitch Roof Extension

    Structural Work Only Starting At:

    £69,000.oo

    Small Wrap Around

    Crown / Pitch Roof Extension

    Structural Work Only Starting At:

    £65,000.oo

    Small Wrap Around

    Rear Flat Roof Extension

    Structural Work Only Starting At:

    £60,000.oo

    Medium Wrap Around

    Rear Flat Roof Extension

    Structural Work Only Starting At:

    £72,000.oo

    Large Wrap Around

    Rear Crown Roof Extension

    Structural Work Only Starting At:

    £91,000.oo

    Small Wrap Around

    Rear Crown Roof Extension

    Structural Work Only Starting At:

    £65,000.oo

    Medium Wrap Around

    Rear Crown Roof Extension

    Structural Work Only Starting At:

    £78,000.oo

    Small Wrap Around

    Rear Gable Roof Extension

    Structural Work Only Starting At:

    £67,000.oo

    Medium Wrap Around

    Rear Gable Roof Extension

    Structural Work Only Starting At:

    £80,000.oo

    Large Wrap Around

    Rear Gable Roof Extension

    Structural Work Only Starting At:

    £93,000.oo