House Extension Milton Keynes – A Guide to Costs, Benefits & Process

Expanding your home is a great way to add extra living space and increase property value. If you’re considering a house extension in Milton Keynes, understanding the costs, process, and benefits is essential. This guide will take you through everything you need to know, including estimated prices, types of extensions, planning permissions, and why modular extensions might be the best option for you.

Why Consider a House Extension in Milton Keynes?

Milton Keynes is a thriving area with growing property demand. Whether you need more space for a growing family, a home office, or a modern open-plan kitchen, a house extension can transform your living space without the stress of moving.

Key Benefits of a House Extension:

✔ Increase Property Value – A well-designed extension can significantly boost your home’s market price. ✔ More Living Space – Add extra bedrooms, a larger kitchen, or a dedicated workspace. ✔ Customised to Your Needs – Tailor the design to your lifestyle preferences. ✔ Avoid Moving Costs – Save on legal fees, stamp duty, and the hassle of relocating.

Types of House Extensions in Milton Keynes

When planning your house extension, the first step is choosing the right type based on your needs and budget.

1. Single-Storey Rear Extensions

A rear house extension is one of the most popular options in Milton Keynes. It extends your home into the garden, providing space for a larger kitchen, dining area, or open-plan living.

• Average Cost: £2,250–£2,750 per sqm
• Planning Permission: Often falls under permitted development

2. Side Return Extensions

This is ideal for terraced or semi-detached homes, making use of the narrow space at the side of the property.

• Average Cost: £50,000–£70,000
• Planning Permission: Required if extending beyond permitted development limits

3. Double-Storey Extensions

For homeowners needing multiple rooms, a double-storey extension offers significant extra space.

• Average Cost: £1,750–£2,500 per sqm
• Planning Permission: Required

4. Wraparound Extensions

A combination of a side and rear extension, providing the maximum expansion possible.

• Average Cost: £70,000–£120,000
• Planning Permission: Usually required

5. Modular Extensions – A Modern Solution

Modular extensions are pre-built off-site and installed quickly on your property, reducing construction time and disruption.

• Faster installation (2–8 weeks instead of months)
• More cost-effective than traditional builds
• Sustainable and energy-efficient materials
• Includes a 25-year warranty for peace of mind

House Extension Costs in Milton Keynes

To give you a rough idea of costs, here’s an estimate based on different extension sizes.

House Extension Cost Table

Size (sqm)	Estimated Cost (£)
10 sqm (Small Extension)	£22,500 – £27,500
20 sqm (Medium Extension)	£45,000 – £55,000
30 sqm (Large Extension)	£67,500 – £82,500
40 sqm (Extra-Large Extension)	£90,000 – £110,000

Additional Costs:

• Architect & planning fees: £1,500 – £3,000
• Structural calculations: £500 – £1,500
• Electrical & plumbing work: £5,000 – £10,000
• Finishing & decorating: £3,000 – £10,000

House Extension Cost Calculator

Want a quick estimate? Enter your extension dimensions below:

Planning Permission & Building Regulations

Do I Need Planning Permission?

Many house extensions in Milton Keynes fall under permitted development, meaning you don’t need planning permission if: ✔ The extension doesn’t exceed 3m for terraced/semi-detached or 4m for detached homes. ✔ The height is below 4m for single-storey extensions. ✔ The materials match the existing property. If your extension exceeds these limits, you’ll need planning permission from Milton Keynes Council. Vergolus can handle this entire process for you.

Building Regulations

All extensions must comply with UK Building Regulations covering:

• Structural integrity
• Fire safety
• Insulation & energy efficiency
• Drainage & ventilation

At Vergolus, we ensure full compliance, giving you a stress-free experience.

FAQs About House Extensions in Milton Keynes

1. How long does a house extension take?

Traditional extensions take 3–6 months, while modular extensions can be completed in 2–8 weeks.

2. Will an extension add value to my home?

Yes! A well-planned extension can add 10–20% to your property value.

3. Can I live in my house during construction?

Yes, but expect some disruption. Modular extensions minimise this issue since they are built off-site.

4. Do I need an architect?

For most extensions, an architect is required to create drawings and submit planning applications.

5. What is the cheapest type of house extension?

Single-storey rear extensions and modular builds tend to be the most affordable.

6. What happens if I build without permission?

You could be asked to demolish the extension or apply for retrospective planning approval.

7. Are modular extensions better than traditional builds?

Modular extensions are faster, cost-effective, and environmentally friendly with a 25-year warranty.

8. Do I need planning permission for a loft conversion?

Most loft conversions fall under permitted development, but larger designs may require permission.

9. What is the best way to finance a house extension?

Many homeowners use savings, home improvement loans, or remortgaging.

10. How do I start my house extension project?

Contact Vergolus for a consultation! We offer a turn-key service covering everything from design to final finishes.

Ready to Start Your House Extension in Milton Keynes?

At Vergolus, we specialise in high-quality modular extensions and traditional builds. Our turn-key service includes: ✅ Architectural designs & planning applications ✅ Structural calculations & building regulations approval ✅ Construction & project management ✅ Full interior finishing (painting, flooring, electrics, and more) Get in touch today for a free consultation! Let’s bring your dream home extension to life.