Single-Story vs. Double-Story Extensions: Which is Right for You?

Gary Newell • 1 November 2024

At Jigsaw Construction Surrey, we often get asked about the benefits of single or double story extensions. This blog talks about the pros and cons of each. 

 

When to Consider an Extension

When your home starts feeling cramped or you want to add a bit of luxury with extra living space, adding an extension can be a fantastic solution. But one of the major decisions you’ll face is whether to opt for a single-story or double-story extension. Each comes with its unique advantages and drawbacks, and the right choice for you will depend on several key factors, from your budget to your future needs. Here are some of the pros and cons of each:


Single-Story Extensions


A single-story extension is an addition to your home that’s built on one level. These are usually connected to existing living spaces, such as extending the kitchen, dining room, or living room. 


Pros of Single-Story Extensions

Single-story extensions typically require less structural work, making them a cost-effective solution for homeowners on a budget. Building a single-story extension often causes less upheaval, especially if the work doesn’t interfere with key areas like bedrooms and bathrooms. If your current foundations are in good shape, you might be able to avoid major (and costly) construction work, further reducing costs and build time. Single-story extensions allow you to create a spacious, open-plan layout that can make your home feel more modern and comfortable.


Cons of Single-Story Extensions

While single-story extensions can add plenty of useful space, they’re limited in terms of how much room they can provide compared to a double-story option.


Depending on where you live, getting approval for a single-story extension may be tricky, particularly in areas with strict building regulations.


Here are some examples of rooms that are commonly built as single-story extensions:


  • Kitchen: Expanding your kitchen is a popular choice for many homeowners, as it's a central hub of the home.
  • Living room: Adding a living room extension can create a spacious and comfortable area for relaxing and entertaining.
  • Bedroom: If you need additional bedrooms, a single-story extension can be a great option.
  • Home office: Creating a dedicated home office space can be a valuable addition to your home.
  • Playroom: If you have children, a playroom extension can provide a designated space for them to play and learn.
  • Conservatory: A conservatory can add a bright and airy space to your home, perfect for relaxing or entertaining.



Double-Story Extensions


If you’re looking to significantly expand your home’s footprint, a double-story extension might be the answer. These extensions add space on two levels, allowing you to create more bedrooms, bathrooms, or living spaces


Pros of Double-Story Extensions

The most obvious advantage of a double-story extension is the extra room you’ll get. Whether you need additional bedrooms, a larger kitchen, or more space for entertaining, a double-story extension can offer significant square footage.


As your family grows, you might find that you need more space for bedrooms, bathrooms, or play areas. A double-story extension can help meet these needs without the need to move to a new home.


Investing in a double-story extension can add substantial value to your home, which is particularly appealing if you’re planning to sell in the future.


Cons of Double-Story Extensions

Double-story extensions require more materials, labour, and planning, which makes them a more expensive option compared to single-story builds. The longer construction time can also cause more disruption to your daily routine.


Building a second floor on your home can be highly disruptive, especially if work involves key living areas such as bedrooms and bathrooms. It may require you to temporarily relocate during some stages of the build.


To support a second story, your home’s foundation may need reinforcement, which adds to both the time and cost of the project.


Here are some common types of rooms that can be built as a double-story extension:


  • Bedrooms: Adding extra bedrooms is a popular reason for building a double-story extension.
  • En-suite bathrooms: Having a private bathroom attached to a bedroom can be a luxurious addition.
  • Dressing rooms: If you have a lot of clothes, a dressing room can be a great way to keep your wardrobe organized and clutter-free.
  • Home offices: A dedicated home office can provide a quiet and productive workspace.
  • Playrooms: If you have children, a playroom can be a great addition to your home.
  • Kitchens: Expanding your kitchen can create a more open and functional space.
  • Living rooms: Adding a second living room can provide a separate space for entertaining or relaxing.



Factors to Consider


Before you decide whether a single-story or double-story extension is best for you, it’s essential to consider a few important factors:


  • Budget: Single-story extensions are generally less expensive than double-story extensions. If you have a limited budget, a single-story extension might be the best option.
  • Planning Permission: It’s important to consult your local planning authority to understand what types of extensions are permitted in your area. In some cases, you may face more restrictions for double-story builds.
  • Lifestyle: Think about your family’s current and future needs. Do you need more bedrooms for a growing family? Or are you looking to create a more open, spacious layout? Your lifestyle will play a big role in determining which type of extension is right for you.
  • Property Value: If you’re thinking about resale value, it’s worth noting that double-story extensions typically add more value to your property than single-story builds.


The type of room you choose will depend on your specific needs and lifestyle. It's important to consider your family's size, hobbies, and how you want to use the additional space. To discuss your extension, get in touch



by Lisa Woolnough 3 September 2025
Planning a home extension in Surrey , a loft conversion , or even a new build? One of the biggest early considerations is whether you’ll need planning permission . For many homeowners, the process can seem confusing—but with the right knowledge and an experienced Surrey construction company by your side, it becomes much simpler. At Jigsaw Construction Surrey , we’ve supported countless homeowners through planning applications, helping them move smoothly from paperwork to building work. Here’s our step-by-step guide to navigating planning permission in Surrey. Step 1: Do You Need Planning Permission in Surrey? Not all building projects require formal approval. Some fall under Permitted Development Rights (PDR), which may allow you to extend or convert your home without submitting a full application. However, in Surrey, these rights can be restricted if your property is: Within a conservation area A listed building Situated in the Green Belt 👉 Before starting your project, check with your local Surrey council or ask our team at Jigsaw Construction Surrey for guidance. Step 2: Understand Local Planning Policies Each borough—Guildford, Elmbridge, Woking, Epsom & Ewell, and others—has its own Local Plan, which sets rules for building work. These policies cover: Building scale and height Design and materials Neighbour impact (privacy, light, outlook) Environmental impact Researching these guidelines early gives your project the best chance of success. Step 3: Create Detailed Plans A strong planning application depends on clear, accurate documents. Typically, you’ll need: Architectural drawings (site plans, elevations, floor layouts) A Design & Access Statement explaining how your design fits local policy Supporting reports (e.g., tree surveys, flood risk assessments) At Jigsaw Construction Surrey , we collaborate with skilled architects to make sure every application is thorough and professionally presented. Step 4: Submitting a Planning Application in Surrey Applications are submitted online via the Planning Portal or your local council’s website. Fees vary depending on the type of project. Once submitted, your application enters the consultation stage. Step 5: Neighbours & Community Consultation Neighbours and other stakeholders are invited to comment on your application. Common concerns include: Loss of light or privacy Parking and traffic impact Design compatibility with the local area Tip: Talking to your neighbours in advance can reduce objections and speed up the approval process. Step 6: The Planning Decision Most councils in Surrey aim to decide within: 8 weeks for smaller projects (such as home extensions) 13 weeks for larger developments If approved, you’ll receive a decision notice with any conditions. If refused, you can appeal—or make changes and reapply. Step 7: After Planning Permission – Building Regulations Even if planning permission is granted, you’ll still need to meet Building Regulations . These ensure that your project is structurally sound, energy-efficient, and safe. Our team at Jigsaw Construction Surrey helps clients every step of the way—from planning permission through to Building Regulations approval and construction. Why Choose Jigsaw Construction Surrey? Navigating planning rules can be complex, but we make the process stress-free. As trusted Surrey builders , we: Advise if planning permission is required for your project Work with architects and planning consultants Submit and support your application Deliver high-quality home extensions, loft conversions, and renovations With our experience, you’ll have peace of mind knowing your project is in expert hands. ✅ Thinking about a home extension or loft conversion in Surrey? Contact Jigsaw Construction Surrey today to discuss your plans—we’ll guide you through planning permission and bring your project to life.
by Lisa Woolnough 1 August 2025
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by Lisa Woolnough 6 July 2025
Creating the Perfect Summer Garden: A Harmonious Blend of Landscaping and Construction  Summer is the perfect time to enjoy your outdoor spaces. A well-designed garden can be a tranquil retreat, a vibrant entertainment area, or a combination of both. Achieving the perfect summer garden often involves both landscaping and construction. Understanding how these two disciplines work together can help you create a stunning and functional outdoor space. Landscaping and construction are not mutually exclusive; they're complementary. Construction provides the “structural framework” for your garden, while landscaping adds the “aesthetic and natural elements.” For example, building a retaining wall (construction) can create levelled planting beds (landscaping). Similarly, installing a patio (construction) provides a foundation for outdoor furniture and container gardens (landscaping). Before starting any landscaping or construction project, careful planning is essential. 1. Assess Your Space: Consider the size, shape, and existing features of your garden. Note the amount of sunlight, soil type, and drainage. 2. Define Your Goals: What do you want to achieve with your summer garden? Do you envision a relaxing oasis, a vibrant entertainment area, or a productive vegetable garden? 3. Create a Design: Sketch out your ideas, incorporating both landscaping and construction elements. Consider the flow of traffic, views from inside the house, and the overall aesthetic. 4. Set a Budget: Determine how much you're willing to spend on the project. Prioritise essential elements and be prepared to make compromises. 5. Hire Professionals (If needed): For complex construction projects, consider hiring a qualified contractor or landscaper. Get multiple quotes and check references. · Start with Construction: Complete any necessary construction work before starting landscaping. This will minimise disruption to plants and soil. · Consider Drainage: Proper drainage is crucial for both construction and landscaping. Ensure that water flows away from buildings and doesn't pool in planting areas. · Choose Materials Wisely: Select durable, weather-resistant materials for construction projects. Opt for plants that are well-suited to your climate and soil conditions. · Incorporate Natural Elements: Blend construction elements with natural features. For example, consider using natural stone for retaining walls or incorporating plants into patios and decks. · Think About Lighting: Strategic lighting can enhance both the beauty and functionality of your summer garden. Use a combination of ambient, task, and accent lighting to create a warm and inviting atmosphere. Once your summer garden is complete, regular maintenance is essential to keep it looking its best. · Watering: Water plants regularly, especially during hot, dry weather. Consider installing an irrigation system to automate watering. · Weeding: Remove weeds regularly to prevent them from competing with your plants for nutrients and water. · Fertilising: Fertilise plants as needed to promote healthy growth and abundant blooms. · Pruning: Prune trees, shrubs, and flowers regularly to maintain their shape and encourage flowering. · Cleaning: Clean patios, decks, and other hard surfaces to remove dirt, debris, and algae. By understanding the interplay between landscaping and construction, you can create a stunning and functional outdoor space that you'll enjoy all summer long. With careful planning, thoughtful design, and regular maintenance, your garden can become a true extension of your home.
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