Looking to maximise your home space in Greater London without sacrificing garden space? A double storey extension could be the perfect solution. At Draw Plans, we specialise in architectural design services for homeowners and developers across the Greater London area, offering professional extension plans starting from just £795 + VAT.

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In this article, we explore everything you need to know about two storey extensions, from design inspiration and layouts to planning tips and estimated costs.

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What Is a Double Storey Extension?

A double storey (or two storey) extension adds two levels of living space to the side or rear of your property. These types of extensions are popular with growing families and property investors looking to increase usable floor area and overall home value.

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Benefits of a Two Storey Extension

• More Living Space: Gain an extra bedroom and bathroom upstairs, and an open-plan kitchen/dining area or utility room downstairs.

• Cost Efficiency: A double storey extension often costs less per square metre than a single storey because the roof and foundations are shared.

• Increase Property Value: A well-designed extension can significantly increase the value of your home.

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Double Storey Extension Costs in Greater London

The cost of a double storey extension in Greater London varies depending on the size, complexity, materials and location. However, a rough guide is:

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• Design & Planning Drawings: From £795 + VAT with Draw Plans

• Construction Costs: Typically £1,800 to £2,800 per square metre

• Planning Application Fees: £202 (if required)

• Structural Engineer Fees: £500 to £1,500

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For a 40m2 double storey extension, the construction could range between £72,000 to £112,000 excluding VAT and design fees.

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Planning a Double Storey Extension: Key Considerations

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1. Planning Permission vs Permitted Development

While some double storey extensions fall under permitted development, most in urban or conservation areas will require planning permission. Our expert team will guide you through the process and prepare all necessary drawings.

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2. Maximise Natural Light

Include skylights, bi-fold doors, or corner glazing to prevent the new space from feeling dark or enclosed.

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3. Seamless Design Integration

Match materials and architectural details to blend the new structure with your existing home. Think about roof pitch, window styles, and brickwork.

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4. Optimise Layout

• Downstairs: Create a large kitchen diner, open-plan living room, or add a utility, pantry, or study.

• Upstairs: Add a spacious bedroom with en-suite or even a home office.

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Double Storey Extension Ideas

• Rear Extension: Great for larger gardens; extend both floors at the back.

• Side Return Extension: Ideal for Victorian or Edwardian terraces.

• Wraparound Extension: Combine rear and side for a dramatic transformation.

• Over-Structure Extension: Build above an existing garage or extension.

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Expert Tips for the Best Double Storey Extension Plans

• Future-Proof the Design: Consider how your family needs might change over time.

• Open-Plan Living: Removing walls downstairs can make the extension feel much bigger.

• Storage is Key: Don’t forget built-in storage, especially in tight London homes.

• Consider Neighbours: Design with privacy and light in mind to avoid planning objections.

• Invest in Quality Drawings: Accurate, detailed architectural plans save time and money during the build.

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Why Choose Draw Plans?

We make the extension planning process simple, affordable and stress-free:

• Plans from just £795 + VAT

• Expert knowledge of local planning policies across Greater London

• Quick turnaround and professional service

• Free consultation to discuss your ideas

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What Our Clients Say

"Draw Plans made the whole process so easy. From initial sketches to approved planning permission, they handled everything. We now have a stunning double storey extension with an extra bedroom and open-plan kitchen. Highly recommended!"

- Sarah & James, Walthamstow

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"The team at Draw Plans really understood our vision and delivered detailed, high-quality drawings that our builder loved. We're thrilled with our new space!"

- A. Khan, Croydon

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"Fantastic service, affordable prices, and expert advice throughout. The extension has added so much value and space to our property."

- Michelle, Barnet

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Ready to Plan Your Two Storey Extension?

Get in touch with Draw Plans today to discuss your ideas and get a free quote. We’re here to turn your vision into planning-approved architectural drawings – efficiently and affordably.