Single-storey house extensions have become a popular choice among homeowners in 2025 due to their cost-effectiveness and practicality. Unlike double-storey extensions, these designs focus on enhancing the ground floor while ensuring a seamless blend with the existing structure. Whether you own a semi-detached, terraced, or detached home, a single-storey extension could be the perfect solution for your needs.
Benefits of Single Storey Extensions
Adding a single-storey extension can transform your home in many ways. Here’s a closer look at the key benefits:
Cost-Effective Space Expansion
One of the most significant advantages is affordability. Single-storey extensions are significantly cheaper than double-storey options, making them a budget-friendly way to add square footage. Whether you’re considering a small 2-3 metre addition or a larger wraparound design, there’s an option for every budget.
Improved Natural Light
Extensions can incorporate features like skylights, roof lanterns, and glass walls, flooding your home with natural light. This is particularly beneficial for creating bright, airy spaces like family kitchens, dining areas, or home offices.
Increased Property Value
Single-storey extensions are not just functional—they’re a significant financial investment. By adding practical and versatile living areas, you can increase your home’s resale value. Potential buyers often view these extensions as attractive features, especially when designed with modern trends in mind.
Sustainable Design Options
Eco-friendly features, such as green roofs and energy-efficient glazing, are becoming more popular. These options not only reduce your carbon footprint but also improve insulation and aesthetic appeal.
Minimal Garden Encroachment
Unlike large-scale renovations, single-storey extensions make efficient use of space without consuming your entire garden. This balance ensures you retain outdoor areas while enjoying the benefits of additional indoor space.
10 Trending Single Storey House Extension Ideas
In 2025, homeowners are exploring creative ways to utilize single-storey extensions. Below, we share 10 trending ideas to inspire your project:
Rear Kitchen-Diner Extension
A rear kitchen-diner extension is perfect for families who want to create a modern, open-plan living area. These designs often feature bi-fold doors or roof lanterns to connect the kitchen to the garden seamlessly. By zoning areas for cooking, dining, and relaxing, you can maximize usability and comfort.
Side Return Expansion
If you live in a Victorian or Edwardian home with a narrow side alley, a side return extension is a great option. By widening the kitchen or living area, you can make the most of otherwise wasted space. Adding skylights ensures even compact spaces feel bright and inviting.
L-Shaped Wraparound
An L-shaped wraparound extension combines a rear and side extension to create a multifunctional space. This layout is ideal for adding kitchens, utility rooms, or home offices while maintaining a cohesive flow with the rest of the house.
Glass Box Extension
For a sleek, contemporary look, a glass box extension is a stunning choice. Featuring floor-to-ceiling glazing, this style blurs the boundaries between indoors and outdoors. Opt for energy-efficient materials to maintain comfort year-round while enjoying panoramic views of your garden.
Open-Plan Family Room
Transform your ground floor into a versatile family hub with an open-plan design. Sliding doors and carefully zoned lighting can create a space that’s perfect for both lounging and entertaining.
Small but Smart Extension
Even small extensions can make a significant impact. A modest 2-3 metre addition can improve your home’s layout by creating extra storage, enhancing traffic flow, or adding a cozy nook. Thoughtful space planning is key here!
Skylight-Filled Office or Study
With remote work on the rise, dedicated home offices are in demand. A single-storey extension with Velux windows offers the perfect environment for productivity, combining natural light with ergonomic design.
Brick or Timber Clad Design
For a timeless aesthetic, consider a brick or timber-clad extension. These materials complement existing structures while adding a touch of character. Rustic timber finishes are particularly popular for creating cozy, Scandinavian-style spaces.
Orangery-Style Addition
Orangeries blend the best of traditional and modern designs. With robust insulation and large glazed sections, they’re suitable for year-round use and add a luxurious touch to your home.
Eco Green Roof Extension
Sustainability is a key trend in 2025. Green roofs not only improve insulation but also create a stunning visual feature. Pair this with minimalist interiors and indoor plants for a cohesive, eco-friendly design.
Planning and Design Tips
When planning your single-storey extension, it’s essential to consider several factors to ensure a smooth process. Here are some key tips:
Assess Site Constraints
Before starting, evaluate your property’s layout, garden size, and any potential challenges. For example, narrow plots may require creative space-saving solutions.
Understand Planning Permissions
Most single-storey extensions fall under permitted development rights, but it’s important to check local regulations. Consulting an architect or builder can help you navigate these requirements.
Choose the Right Materials
Selecting materials that complement your home’s existing structure ensures a cohesive look. For modern designs, glass and steel are popular choices, while brick or timber works well for traditional homes.
Maximize Natural Light
Incorporate features like skylights and bi-fold doors to enhance brightness and create a sense of openness.
Consult Professionals
Working with architects or builders can help you create custom layouts that maximize space, light, and functionality.
Cost Breakdown and Return on Investment (ROI)
The cost of a single-storey extension varies depending on size, materials, and location. Below is a general breakdown:
Extension Type Cost (Per Square Metre)Total Cost (Approx.)
Small Kitchen Extension £1,500 – £2,500 £30,000+
Wraparound Extension £2,000 – £3,000 £50,000+
Glass Box or Contemporary £2,500 – £3,500 £60,000+
ROI Potential
- Adds 10-20% to property value.
- Quick build times (8-12 weeks) minimize disruption while offering long-term benefits.
