Extension Estimator

Vision To Value

Before After

Planning Your Budget

Start by defining your needs and preferences. Consult with a professional to get an accurate estimate based on your specific project details. Remember, investing in quality design and construction not only adds immediate value and enjoyment to your home but can also increase its long-term resale value.

For a detailed quote and consultation on your home extension project, contact us today. Let us help you make your dream home a reality.

Costs of Building an Extension

While prices can vary widely, here are some average costs to give you a starting point:

Single story extensions:
Typically range from £2,500 per square metre. For high-end finishes and materials, costs can range up to £3,000 per square metre plus.

Two story extensions:
These usually cost 50% more than single story extensions due to the added complexity and materials needed.

Kitchen or Bathroom Extensions:
Adding plumbing and high quality fixtures can increase the cost. Expect to pay at least 20-25% more for extensions that include these rooms.

It’s also wise to set aside a contingency fund of around 10% of the total project cost to cover any unforeseen expenses or changes to the project scope.

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Vision to Value In 5 Easy Steps


Initial Architectural Drawings


Birch Construction will give you an estimate


Apply for planning permission if required


Birch Construction to give full detailed quote


Construction begins with detailed timeline schedule



Prices are rough estimations, for full quote, please get in touch






I would like to be contacted regarding my estimate for a full consultation
Extensions Norfolk

Factors Influencing the Cost of an Extension

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Size and Complexity

The larger and more complex your extension, the higher the cost will be. Simple, single-story extensions are generally more affordable than those that are multi-storied or require significant structural changes to your existing home. This is because the more extensive the project, the more materials, labour, and time are required. Multi-storied extensions, for instance, involve more complex engineering and construction work, not to mention the additional planning permissions that may be necessary.

On the other hand, single-story extensions often require less in terms of materials and can be completed more quickly, leading to lower overall costs. Moreover, these extensions usually do not require the extensive structural alterations needed for adding additional floors, making them a more straightforward and budget-friendly option for many homeowners.

Materials and Finishes

The choice of materials and finishes has a significant impact on the overall cost of building an extension. Opting for high-end materials and finishes will undoubtedly increase the price of the project. Luxurious options such as marble countertops, hardwood flooring, and bespoke cabinetry can elevate the aesthetics and functionality of your extension but come at a premium. These materials often require specialised installation skills and can significantly extend the timeframe and budget of the project.

Conversely, selecting more standard options can help keep costs down while still achieving a fresh and appealing look. Materials such as laminate worktops, engineered wood flooring, and standard factory-made cabinetry are considerably more budget-friendly and can often be just as durable and attractive as their more expensive counterparts. This approach allows homeowners to manage their budgets more effectively, ensuring that they can complete their extension projects without compromising on quality or style.

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