Single Storey vs Two Storey

Deciding between a single storey and two storey extension? Explore the benefits, costs, and planning permission for each option to find the perfect fit for your home.

Single Storey vs Two Storey Extension: Which Is Right for You?

Extending your home is an excellent way to add value, create extra space, and enhance the functionality of your existing house. But when it comes to choosing between a single storey extension or a two storey extension, the decision can be daunting. Each option has its own benefits, costs, and requirements. In this guide, we’ll explore both types of storey extensions, the factors to consider, and how Oaklea Construction can help make your extension project seamless and successful.

Why Consider a House Extension?

A house extension is a cost-effective alternative to moving. Whether you need a kitchen extension, an extra bedroom, or simply more ground floor living space, extending can add value to your home. However, before you start, understanding the differences between a single storey and a two storey extension is crucial.

Single Storey Extension

A single storey extension is typically added to the ground floor of the existing property. It can be used for a kitchen extension, an open-plan living area, or an additional room.

Pros of a Single Storey Extension

1. Lower Costs: The cost of a single storey extension is generally more affordable compared to a double storey extension. The average cost is between £1,750 and £2,750 per square metre for the building cost, depending on design and materials.
2. Simplified Planning: In many cases, you can build under permitted development rights, meaning you may not need planning permission. However, extensions over 3 metres for terraced or semi-detached houses and 4 metres for detached houses may require a planning application.
3. Less Disruption: Since the work is confined to the ground floor, a single storey extension causes less disruption to your daily life.
4. Versatility: Ideal for creating open-plan spaces or adding a kitchen extension.

Cons of a Single Storey Extension

1. Limited Space: A single storey extension may not provide as much extra space as a two storey extension.
2. Loss of Garden Space: Extending outward can reduce your garden space.
3. Value Considerations: While a single storey extension can add value to your home, a double storey option often offers a better investment.

Two Storey Extension

A two storey extension (or double storey extension) adds space across two floors. It’s a perfect solution if you need both ground floor and first floor expansion.

Pros of a Two Storey Extension

1. More Space: A two storey extension provides double the space, ideal for adding both a living area and an extra bedroom.
2. Better Value for Money: The cost per square metre of a double storey extension is often lower than a single storey extension, as you’re maximizing the use of your foundations and roofing.
3. Adds Significant Value: A two-storey extension can add value to a property more substantially than a single-storey extension.
4. Flexibility: Offers opportunities for various layouts, like adding a bedroom upstairs and a kitchen extension downstairs.

Cons of a Two Storey Extension

1. Higher Costs: The cost of a double storey extension varies but typically ranges between £2,000 and £3,200 per square metre due to excavation and the roofing costs.
2. Planning Permission: You’re more likely to need planning permission for a two storey extension. You’ll need to seek planning permission and comply with building regulations.
3. More Disruption: Adding two floors means more extensive building work, affecting your home life for longer.

Cost Comparison: Single Storey vs Two Storey Extension

When considering the extension costs, it’s important to note that while a single storey extension is cheaper upfront, a two storey extension offers more value per square metre. The current average cost breakdown is as follows:

• Single Storey: Figures ranging from £1,750 to £2,750 per square metre.
• Double Storey: Costs typically range between £2,000 and £3,200 per square metre.

While the cost of a single-storey extension may appear lower, the cost per square metre for a double storey extension is more efficient, making it a better investment in the long term.

Key Considerations for Your Extension Project

1. Planning Permission: Whether you need planning permission depends on the size and location of the extension. Oaklea Construction provides expert advice on whether your extension may require a planning application or can be built under permitted development rights.
2. Building Regulations: All extensions must comply with building regulations. Our construction company ensures that all work carried out meets legal standards.
3. Neighbour Considerations: Informing your neighbour and possibly hiring a party wall surveyor is essential, especially for terraced or semi-detached houses.
4. Space and Design: Consider the structural design, existing house layout, and how much garden space you’re willing to sacrifice.

Why Choose Oaklea Construction for Your Extension Project?

At Oaklea Construction, we specialize in delivering high-quality single storey and two storey extensions tailored to your needs. Our team of architects, structural engineers, and builders provide:

• Expert Advice on planning permission and building regulations.
• Comprehensive support from design to completion.
• Efficient and cost-effective solutions to add value to your home.
• Seamless coordination to minimize disruption during the build.

Whether you’re looking for a single-storey extension or considering a change from single to double storey, we are here to help you make the right decision for your existing property.

Ready to Extend Your Home?

Contact Oaklea Construction today for a consultation. Let us help you unlock the potential of your home with a bespoke house extension that meets your needs and adds value to your home.