WILL A HOUSE EXTENSION ADD VALUE?

Homeowners are always looking for ways to increase their property’s value and living conditions, and doing a house extension is one of the most popular methods to achieve it. Are you wondering what types of extensions can give the best return on investment or whether it’s more cost-effective to extend or move? Let’s explore this topic and you’ll discover why Andrew Wallace Architects is a good choice for your next project. So, will a house extension add value to your property?

In short, a house extension can add significant value to your property. In fact, a well-designed extension makes your home more appealing to a wider range of buyers and adds extra space, enhancing functionality, comfort, and luxury—key selling points in real estate.

Read on to find out how much value an extension adds and which types of extension add the most value.

Does An Extension Add Value To Your House?

Yes! A house extension can add significant value to your property. However, the actual increase depends on various factors like the type and size of an extension, the quality of workmanship and materials used, and your property’s location. A well-designed and executed extension can make your home more marketable, attracting a wider range of buyers.

More space often means more functionality, comfort and luxury, which are key selling points in real estate. Families often look for properties with extra/spare bedrooms, larger kitchens or a separate playroom, while young professionals might prefer a contemporary home office or spacious living area. Understanding market demand and potential buyers in your area is important before starting an extension project.

How Much Does An Extension Add To The Value of a House?

The value added by a house extension can vary widely. On average, a well-planned and executed extension can add between 10% and 20% to your property’s value. However, the exact amount depends on several factors, including the type and size of the extension, the quality of materials used, the quality of workmanship, the overall finish and how well it blends in with the rest of the house and existing surroundings.

For example, a single-storey extension that adds a larger kitchen (like in the house 002 project) or an additional living room (like in the house 177 project) can increase a property’s value by about 5-10%. In contrast, a two-storey extension (like in the house 141 project) that adds extra bedrooms and bathrooms can boost the value by 15-20%. Loft conversions (like in the house 075 project) are also popular and can add up to 20% to the property’s value, depending on the size and finish. Combine several extensions and the increase in value will be even more, for example, rear extension and loft conversion like in the house 145 project.

It helps to consider your potential future buyers’ likely needs before starting the project. Engaging with a professional architect, like Andrew Wallace Architects, can provide valuable insights into the extension design process and help you make an informed decision.

What Type of Extension Adds The Most Value?

The extension that adds the most value depends on what potential buyers in your area are looking for, the deficiencies in your house, and the needs you want to fulfil. At Andrew Wallace Architects, we recognise that some extensions generally offer higher returns than others:

  1. Kitchen Extensions – A spacious, modern kitchen is often at the top of buyers’ wish lists. Extending your kitchen to create an open-plan dining and living area like in the house 141 project, can significantly boost your home’s appeal and value. High-quality finishes and modern appliances can further enhance this effect.
  2. Loft Conversions – Loft conversions are an excellent way to add an extra office or bedrooms and bathrooms like in the house 145 project, which can significantly increase your property’s value. This type of extension is particularly valuable in areas where extra space for potential extension is limited.
  3. Basement Conversions – Basement conversions like the house 135 project, can provide a substantial return on investment, especially in urban areas where space is a premium. However, they are potentially more costly than loft conversions due to the nature of construction works. They can be transformed into various functional spaces, including home offices, gyms, or additional living areas.
  4. Conservatories and Orangeries – These extensions can add a unique and elegant touch to your home, creating a bright and airy space that can be used year-round. They are particularly appealing in properties with large gardens bringing the outdoors inside – see the house 182 project.
  5. Garage Conversions – Transforming an underutilised garage into a functional living space, such as a home office or an extra bedroom, can add considerable value to your property.

Is Getting An Extension a Good Investment?

Yes. Getting an extension can be a really good investment. Extensions can increase your living space and enhance the functionality and aesthetics of your home. A well-planned and executed extension can make your property much more attractive to potential buyers. It will also allow you to increase your current living conditions. A win-win!

Therefore, investing in a house extension can be a smart financial decision if executed by experienced professionals, such as Andrew Wallace Architects. This will ensure the extension is designed to the highest standards and fits harmoniously with your existing home.

Increased Property Value

Extensions can substantially increase the value of your home. An extension often provides a return on investment that exceeds the cost of the extension itself, like the house 177 project.


Improved Living Conditions

An extension can provide your needed and desired space, improving your overall quality and comfort of life without the hassle and cost of moving, like in the house 158 project.


Tailored Space

Extensions allow you to redesign your home to better suit your needs and preferences, creating a space that is unique. Whether it’s a kitchen overhaul like in the house 002 project, a living room update, or a master bedroom makeover, an architect like Andrew Wallace Architects can bring fresh ideas and professional expertise to tailor the space to your needs.

Is It Cheaper To Extend Or Move?

In most situations, it’s cheaper to extend. However, it depends on several factors such as the costs associated with moving and the cost of the extension. In many cases, extending can be a more cost-effective solution, especially in the increased demand/ popular areas where property prices are relatively high.

Below, we outline the main costs to consider:

Estate Agents Fees – When moving, you should consider costs such as estate agent fees, as selling your current home will likely involve hiring an estate agent, whose fees can be a significant expense.

Stamp Duty – Also, purchasing a new property often involves paying stamp duty, which can add thousands of pounds to the cost.

Legal Fees – There are also legal fees associated with buying and selling property.

Moving Costs – Finally, the logistical costs of moving, including hiring a moving company can be substantial.

Construction Costs – When extending, you should obviously consider the construction cost of an extension, which varies depending on the size and complexity of the project. If the extension work is extensive, and you can’t partially occupy your house, you may need to arrange temporary accommodation, adding to the overall cost.


In most cases, the combined costs of moving including all the fees can exceed the cost of extending, making an extension a more economical choice which can be tailored to your needs. Therefore, don’t hesitate to contact Andrew Wallace Architects who can increase your living space, and improve the functionality and aesthetics of your home.

Why Choose Andrew Wallace Architects

Andrew Wallace Architects offer a full range of services from initial concept to final construction, smoothly managing your project. We take the time to understand your unique needs and preferences, ensuring every design is tailored to you. Our designers are experienced professionals passionate about creating beautiful, functional spaces.

Our commitment to client satisfaction is reflected in the glowing testimonials from our happy clients. Combining creativity with practicality, our team are experts at transforming spaces into stunning, functional environments.

Contact us today to discuss how we can tailor our services to meet your specific house extension requirements.

Contact Andrew Wallace Architects