Single-Storey Extension Cost Calculator

Factor	Cost Range	Notes
Design and Planning	$1,000 – $5,000	Architect fees, planning permission, and drawings
Construction
– Labor	$80 – $150 per square foot	Experienced builders may charge more
– Materials	$100 – $300 per square foot	Quality and type of materials can affect the cost
– Foundation	$10,000 – $20,000	Type and depth of foundation required
– Framing	$15,000 – $25,000	Wood or steel framing, roof structure
– Roofing	$5,000 – $15,000	Type of roofing material and complexity
– Windows and Doors	$2,000 – $10,000	Quality and style
– Electrical and Plumbing	$5,000 – $10,000	Depends on the complexity of electrical and plumbing
Finishes
– Flooring	$5,000 – $10,000	Type of flooring material
– Insulation	$2,000 – $5,000	Quality and type
– Painting and Decoration	$2,000 – $5,000	Quality of finishes and extent of work
Miscellaneous
– Permits and Inspections	$1,000 – $2,000	Local permits and inspections
– Contingency	10% – 20% of total cost	Unforeseen expenses
Total Estimated Cost

FAQs

How much does a single storey extension cost in 2023?

• The cost of a single-storey extension in 2023 can vary significantly based on location, size, materials, and design. A rough estimation could be anywhere from £1,500 to £3,000 per square meter, so for a typical 20 square meter extension, it might cost around £30,000 to £60,000.

How much does a 20 square metre extension cost?

• A 20 square meter extension can cost approximately £30,000 to £60,000 or more, depending on various factors.

What is the most expensive part of building an extension?

• The most expensive part of building an extension is often the structural work, including foundations, framing, and roofing. High-end finishes, such as kitchens and bathrooms, can also significantly contribute to the cost.

How do you calculate the cost of an extension?

• The cost of an extension can be calculated by multiplying the total floor area (in square meters) by the cost per square meter. Additional costs should be considered for design, planning, permits, and finishes.

Is 2023 a good year to build an extension?

• The choice of when to build an extension depends on your specific circumstances and needs. Economic factors and market conditions can vary, so it’s essential to consider your budget and goals.

What is the cheapest way to do an extension?

• The cheapest way to do an extension is often to keep the design simple, choose cost-effective materials, and minimize structural changes. However, cost-saving measures should not compromise quality and safety.

How much does a 50m2 extension cost?

• A 50 square meter extension can cost approximately £75,000 to £150,000 or more, depending on location, design, and finishes.

How much does a 30m2 extension cost in the UK?

• A 30 square meter extension in the UK can cost around £45,000 to £90,000 or more, depending on various factors.

How much does a 40 square meter extension cost?

• A 40 square meter extension can cost roughly £60,000 to £120,000 or more, depending on location, materials, and design.

How much does a single-story extension cost in the UK?

• The cost of a single-story extension in the UK varies widely based on factors like location, size, and design. As a rough estimate, it can range from £1,500 to £3,000 per square meter.

How do people afford to build extensions?

• People afford to build extensions through various means, including savings, loans, mortgages, or financing options like home improvement loans or equity release.

How much does a 25m2 extension cost?

• A 25 square meter extension can cost approximately £37,500 to £75,000 or more, depending on location and specifications.

How much should an extension cost in the UK?

• The cost of an extension in the UK depends on multiple factors, but a general estimate is around £1,500 to £3,000 per square meter.

What makes an extension expensive?

• Extensions can become expensive due to factors such as high-quality finishes, complex designs, structural changes, and premium materials.

How much does a 4-meter extension cost?

• The cost of a 4-meter extension can vary but might range from approximately £6,000 to £12,000 per linear meter, depending on factors like location and design.

Is it cheaper to extend or move?

• Whether it’s cheaper to extend or move depends on factors like the local housing market, the cost of building an extension, and your specific needs.

Will building costs go down in 2023 in the UK?

• Predicting future building costs is challenging. They can be influenced by economic conditions and market dynamics, which can vary.

Will building costs come down in 2024?

• The trajectory of building costs in 2024 and beyond is uncertain and depends on various economic factors.

Is 30k enough for an extension?

• £30,000 can cover the cost of a smaller, more basic extension. However, the final cost depends on many variables, so it’s essential to obtain quotes based on your specific requirements.

Is it worth doing a small extension?

• Whether a small extension is worth it depends on your needs and budget. It can provide additional space and potentially increase the value of your home.

How much do builders charge for an extension?

• Builders’ fees for an extension can vary widely based on location and complexity. On average, builders might charge between £1,000 and £2,500 per square meter.

How long does a single-storey extension take?

• The duration of a single-storey extension can vary from a few weeks to several months, depending on factors like size, complexity, and weather conditions.

Do I need an architect for an extension?

• You may need an architect for an extension, especially if it involves significant structural changes or requires planning permission. An architect can also help with design and compliance.

Is now a good time to build an extension?

• The timing for building an extension depends on your specific needs and circumstances. It’s advisable to consult with professionals and assess your financial readiness.

How can I reduce the cost of an extension in the UK?

• To reduce the cost of an extension, consider simplifying the design, using cost-effective materials, obtaining multiple quotes, and managing the project efficiently.

What is a shell-only extension?

• A shell-only extension typically includes the structural work, roof, walls, and windows but lacks interior finishes. It allows for cost savings and flexibility in interior design.

Do I need an architect for a small extension in the UK?

• Even for small extensions in the UK, it’s advisable to consult with an architect, especially if planning permission or structural changes are involved.

How big is a 20 square meter extension?

• A 20 square meter extension is approximately 4.47 meters by 4.47 meters in size (assuming it is a square or rectangular shape).

How much does a single extension cost?

• The cost of a single extension varies widely based on factors like size and location. A rough estimate could be between £30,000 and £150,000 or more.

How big of an extension can I build without planning permission in the UK?

• In the UK, you can often build a single-storey extension of up to 3 meters in depth for an attached house and 4 meters for a detached house without planning permission, subject to certain conditions.

Will a single-storey extension add value to my property?

• A well-designed and executed single-storey extension can add value to your property by increasing living space and improving functionality. However, the value added can vary.

How long does it take to build a single-storey extension in the UK?

• The time to build a single-storey extension in the UK can vary from a few months to half a year or more, depending on factors like size and complexity.

How much would a 15m2 extension cost?

• A 15 square meter extension can cost approximately £22,500 to £45,000 or more, depending on location and specifications.

Are extensions worth the cost?

• The worthiness of an extension depends on your specific needs and long-term goals. It can provide additional space and potentially increase property value.

How much roughly is a house extension in the UK?

• A house extension in the UK can cost anywhere from a few thousand pounds for small, basic extensions to over £100,000 for larger, more complex projects.

Is the cost of an extension worth it?

• Whether the cost of an extension is worth it depends on your personal circumstances, needs, and long-term plans for the property.

Is £40k enough to renovate a house in the UK?

• £40,000 can cover some renovation projects in the UK, but the extent of renovation and costs can vary widely. It’s essential to budget carefully and prioritize expenses.

How long does an extension take to build?

• The construction time for an extension varies based on factors like size, complexity, and weather conditions. It can range from a few weeks to several months.

Can I build a small extension without planning permission?

• In some cases, you may be able to build a small extension without planning permission in the UK, depending on size and other factors. It’s important to check local regulations.

Is an extension cheaper than a conservatory?

• Extensions and conservatories vary in cost based on factors like design and materials. In some cases, extensions can be more expensive due to their structural complexity.

Is an extension worth it in the UK?

• Whether an extension is worth it in the UK depends on your specific needs, budget, and long-term plans. It can provide additional space and potentially increase property value.

How much does a full head of extensions cost in the UK?

• The cost of a full head of hair extensions in the UK can vary widely but may range from £200 to £600 or more, depending on the type and quality of extensions.