House Extension Cost Calculator

FAQs

How do you calculate cost of extension?

The cost of an extension can be calculated by multiplying the size of the extension (in square meters) by the cost per square meter of construction.

How much does a 20 square metre extension cost?

The cost of a 20 square metre extension can vary depending on factors such as location, materials used, and design specifications. As an estimation, the cost could range from £20,000 to £60,000 or more.

What is the formula for the extension cost?

The formula for calculating the extension cost is:

Extension Cost = Size of Extension (in square meters) × Cost per Square Meter

How much is a single story extension?

The cost of a single-story extension depends on various factors such as size, location, materials, and labor costs. As an estimation, it can range from £1,000 to £2,000 per square meter.

How can I reduce the cost of an extension?

Some ways to reduce the cost of an extension include:

• Simplifying the design
• Using more affordable materials
• Managing the project yourself (if feasible)
• Comparing quotes from multiple contractors
• Timing the project during off-peak seasons

How much would a 3 metre square extension cost?

The cost of a 3-meter square extension can vary, but as an estimation, it could range from £15,000 to £45,000 or more, depending on various factors.

What is the most expensive part of an extension?

The most expensive part of an extension is typically the construction labor and materials, followed by any specialized features or finishes.

How much does a 4m extension cost?

The cost of a 4-meter extension can vary widely depending on factors such as location, materials, and design complexity. As an estimation, it could range from £20,000 to £80,000 or more.

How much does a 50m2 extension cost?

The cost of a 50 square meter extension can vary significantly based on various factors, but it could range from £50,000 to £200,000 or more.

How much should an extension cost UK?

In the UK, the cost of an extension can vary widely depending on factors such as location, size, design complexity, materials used, and labor costs. On average, it could range from £1,000 to £3,000 per square meter.

What is the rule of thumb for extension costs?

A common rule of thumb for extension costs in the UK is around £1,000 to £3,000 per square meter, depending on factors such as location and quality of materials.

How much does it cost to build an extension per sqm?

The cost to build an extension per square meter can vary depending on factors such as location, materials used, and labor costs. On average, it could range from £1,000 to £3,000 per square meter.

How much does a 3 metre single storey extension cost?

A 3-meter single-storey extension can cost anywhere from £15,000 to £45,000 or more, depending on various factors such as location, materials used, and design specifications.

How much does an extension cost per sqm UK?

The cost of an extension per square meter in the UK can vary widely depending on factors such as location, materials used, and design specifications. On average, it could range from £1,000 to £3,000 per square meter.

Is a small extension worth it?

Whether a small extension is worth it depends on individual circumstances, such as the intended use of the extension, the property's value, and budget constraints. In many cases, a well-designed and executed extension can add value to a property and improve living space.

How do most people afford extension?

Most people afford extensions through savings, loans, mortgages, or a combination of these. Some may also consider financing options offered by banks or specialty lenders.

Is now a bad time to build an extension?

The timing of building an extension depends on various factors such as personal circumstances, market conditions, and construction costs. It's advisable to consult with professionals and consider factors like availability of contractors and materials before proceeding.

Can an extension devalue a house?

An extension done poorly or without proper planning could potentially devalue a house if it negatively impacts the property's aesthetics, functionality, or structural integrity. However, a well-designed and executed extension can add value to a property.

How long does a 3 metre extension take?

The duration of a 3-meter extension project can vary depending on factors such as weather, planning permissions, and complexity of the build. As a rough estimate, it could take anywhere from 2 to 6 months or more to complete.

How much does a 40 square meter extension cost?

The cost of a 40 square meter extension can vary based on factors such as location, materials, and design complexity. As an estimation, it could range from £40,000 to £120,000 or more.

Can I do a 3 metre extension without planning permission?

In some cases, a 3-meter extension may be allowed under permitted development rights without the need for planning permission, provided certain criteria are met. It's advisable to check with local authorities or consult with a planning expert to confirm eligibility.

What are the cheapest kind of extensions?

The cheapest kinds of extensions are typically those that are simple in design, use cost-effective materials, and minimize structural changes. Examples include single-story rear extensions and garage conversions.

How long does an extension take?

The duration of an extension project depends on factors such as the size, complexity, weather conditions, and availability of contractors. Generally, small to medium-sized extensions can take anywhere from a few weeks to several months to complete.