At KT5 Construction, your local builder serving London and Surrey, we understand that choosing between a rear vs side extension isn’t just about space—it’s about creating a home that works better for your lifestyle. Whether you’re dreaming of an open-plan kitchen or simply need a functional utility room, the right extension can make a world of difference.

This comprehensive guide compares both extension types and highlights how KT5 can help bring your vision to life—on time, within budget, and built to last.

What Is a Rear Extension?

A rear extension expands your home into the garden and is ideal if you want more space for everyday living or entertaining.

Key Benefits:

• • Perfect for open-plan designs – Create a spacious kitchen, dining, or family zone.

  • Brings in natural light – With skylights and bi-fold doors, enjoy a bright, airy feel.

  • Great for entertaining – Seamlessly connect indoor spaces to your garden.

  • Boosts property value – Especially effective in high-demand areas of London and Surrey.

What Is a Side Extension?

A side extension makes use of the often-unused alley space beside your home. It’s a smart choice if your garden is limited but you still need more internal space.

Key Benefits:

• • Optimises ‘dead’ space – Maximise narrow side returns found in many Victorian and Edwardian homes.

  • Preserves your garden – Ideal for urban properties where green space is valuable.

  • Perfect for functional spaces – Add a utility room, WC, cloakroom or compact study.

  • Discreet construction – Often more straightforward to approve in planning applications.

Rear vs Side: Which One Suits You?

Should You Consider a Wraparound Extension?

Why choose one when you can have both? A wraparound extension combines rear and side designs for maximum internal space and flexibility.

Ideal For:

• • Open-plan kitchen-diner-lounge combinations

  • Extra bathrooms, utility areas, or boot rooms

  • Period homes with awkward floorplans

  • Homeowners wanting a transformative layout upgrade

Factors to Consider Before You Decide

Every home is different. At KT5, we help you think beyond the floorplan to make sure your extension supports your life.

1. Outdoor Space

Is preserving your garden a priority, or do you prefer indoor comfort? We’ll help you find balance.

2. Functionality

Need somewhere practical like a utility space or home office? A side extension may be your answer.

3. Budget

Smaller side extensions are usually less expensive. Rear extensions offer bigger visual impact. KT5 will guide you through what’s achievable within your budget.

4. Permissions & Regulations

Some extensions fall under permitted development, others need planning approval. We’ll handle it all—drawings, submissions, and building regs—so you don’t have to.

Why KT5 Construction Is the Right Choice

When it comes to house extensions in London and Surrey, KT5 Construction brings unmatched expertise, quality, and support to every build.

Our Promise:

• • Expert project guidance from concept to completion
  • Honest pricing with cost-saving recommendations
  • Planning and regulation support
  • Premium materials and lasting workmanship
  • A team that listens, advises, and delivers

We don’t just build extensions—we create lifestyle upgrades. Many clients choose us not just for our quality builds, but because we help value-engineer the entire process, often saving them thousands.

Frequently Asked Questions

1. Is a side or rear extension more cost-effective?
Side extensions are typically more affordable. Rear extensions add more space and long-term value.

2. Will I need planning permission?
Possibly. Many rear extensions fall under permitted development, but we always confirm this before starting.

3. Can I combine both?
Yes—KT5 are specialists in wraparound extensions. They offer maximum floor space and visual impact.

4. How long will it take?
Most single-storey extensions take 10–16 weeks. We provide a detailed programme and stay on track.

Ready to Extend Your Home?

Whether you’re still deciding or already planning, KT5 Construction is ready to help. We’ve supported homeowners across London and Surrey with stunning, functional, and budget-conscious home extensions.

Email us your requirements today
Book a free consultation with our extension experts
Contact KT5 Construction Now

Let’s turn your extension ideas into something you’ll love living in—start your journey with KT5 today.