Constructing an Extension on a Budget: Here's our 5 Top Tips.

June 2025

Adding an extension to your home can be an awesome way to increase your living space, However, costs can quickly mount up if you’re not careful. The great news is that with some thoughtful planning, expert design from our talented team, you can create a stunning, functional extension without breaking the bank. At Sketchpad, we’ve helped 1000's of homeowners just like you bring their extension ideas from a sketch to reality while sticking to a budget. Here are our top 5 expert tips to help you build an extension on a budget.

1. Plan, Plan, Plan, Then Plan Some More!!!

The most important things you can do to stay within budget is to have a clear and detailed plan from the start. Essentially, this means that you need to know what you want from the design and how its going to impact on your budget. By working with us here at sketchpad we will develop a design that maximises space, looks beautiful and has bee designed with practicality and cost in mind.

Tip: Be super realistic about what’s achievable within your budget and give consideration to your must-have features over nice-to-haves.

2. Choose Cost-Effective Materials

We all know that the specification and materials you choose can significantly impact the cost of your extension. Whilst luxury high-end finishes can create a stunning finish, there are plenty of more reasonably priced alternatives that still offer great style and durability. By selecting materials like concrete, timber, or basic brickwork for the structure can help keep costs down, In addition to this more affordable tiles, fixtures, and fittings can make the interior feel modern and functional without the hefty price tag.

Tip: Think about using reclaimed or second-hand materials, which can add character and save you money.

3. Opt For A Simple Design

Complex designs tend to drive up costs due to increased material needs and labour time. Choosing clean lines and a straightforward layout can help keep your project within budget. Rather than investing in elaborate architectural features or custom finishes, focus on a design that enhances natural light and makes efficient use of space.

Tip: A single-storey extension is usually more cost-effective than building multiple levels. Keeping the design simple can lead to significant savings.

4. Choose Contractors Wisely

Selecting the right contractors is crucial to keeping your project on budget. Take the time to research, compare multiple quotes, and look beyond just the lowest price—experience and reliability matter just as much. A reputable contractor with a proven track record can help you avoid delays, subpar work, and unexpected costs later on.

Tip: If you're working with a tight budget, hiring a project manager can be a smart investment. They can coordinate the build, keep things on track, and help prevent costly errors.

5. Create A Detailed Scope Of Works & Architectural Drawings

Clear and comprehensive documentation is key to getting accurate quotes from builders. A well-prepared scope of works and detailed architectural drawings ensure everyone understands exactly what’s involved in the project. This reduces the risk of miscommunication, unexpected costs, or changes during the build—helping you stay on time and on budget.

Tip: Collaborate with our awesome design team to develop precise drawings. This helps ensure your extension is built exactly as planned and minimizes the likelihood of costly adjustments later.

Conclusion

Building an extension on a budget doesn’t mean you have to sacrifice quality or style. With thoughtful planning, smart material choices, a streamlined design, reliable contractors, and clear documentation, you can achieve a stunning and practical extension that enhances your home—without overspending. Thinking about extending your home? Get in touch with Sketchpad for expert advice on bringing your vision to life while staying within budget.