Extension builder cost per hour

Builders that specialise in extensions work with loft conversions, extensions and basement conversions, so generally charge more per hour than other general builders. Hourly rates depend on where you live and often the type of renovation or conversion work you’re looking for. The average cost per hour for a renovation specialist is £29, but it can range from £16 - £39.

See our extension builder rates table for more hourly rates broken down by location. Or, post your job on HaMuch and get a more accurate quote for free.

Builder cost per day

Most builders will give you a day rate, since a house extension, garage conversion or loft conversion will take at least a few weeks! The average day rate for a builder doing large works is £208, but again, depending on where you live and the type of project it could range between £134 - £249. 

It’s also worth remembering that small, family-owned businesses will generally charge less than larger construction companies as they will have fewer overheads.

Check our rates table for builder day rates in your area.

How to get the cheapest quotes when looking for a builder that does extensions

When seeking the cheapest quotes from builders that specialise in extensions, it's important to keep in mind that the lowest price doesn’t always guarantee the best quality or value. However, if cost is a significant factor for you, here are some tips to help you get competitive quotes:

Research and compare: Take the time to research and identify multiple renovation specialists in your area. Look for builders who have experience in the type of project you're undertaking. It’s also worth asking for recommendations from friends, family, or trusted sources. Request quotes from several builders and carefully compare them to understand the scope of work, materials included, and any additional services offered. You can also use HaMuch to get a free, no obligation quote – simply post your job to get in touch with local renovation specialists.

Provide detailed information: When requesting quotes, provide clear and detailed information about your project. Include relevant plans and any specific requirements or preferences you have. The more precise and comprehensive your information, the more accurate and competitive the quotes are likely to be – and it will reduce any surprise added costs further down the line.

Request itemised quotes: Ask builders to provide itemised quotes that break down the costs for different aspects of the project, such as labour, materials, permits, and any additional services. This transparency allows you to assess each quote's components and identify any potential areas for negotiation or cost savings.

Ask how you can reduce the cost: During the quote process, ask the builders for suggestions on how to reduce costs without compromising quality. Experienced builders may provide alternative construction methods, materials, or design tweaks that can help you achieve your goals within a tighter budget.

Negotiate: Once you have received quotes, don't be afraid to negotiate with builders. Seek clarification on any ambiguous or unclear elements and discuss potential cost reductions or value-added services. However, be cautious about excessively low quotes, as that might show that the builder hasn’t got the relevant skills they need or will hike up the price later on.

Check references and reviews: Before making a final decision based on cost alone, thoroughly research each builder's reputation. Request references from their previous clients and inquire about their experience, reliability and workmanship. Read online reviews and check their certifications to ensure they meet the necessary standards.

Choosing a builder that does large works

Choosing the right builder for your renovation project is crucial to ensure you get the best finish yo can. Here are some essential steps to guide you in the selection process:

Check credentials and experience: Verify the credentials and qualifications of potential builders. Ensure they hold the necessary certifications, trade body memberships and insurance coverage. Additionally, assess their experience by reviewing their portfolio of completed projects, as well as any testimonials or references from previous clients.

Conduct interviews: Narrow down your list of potential builders and arrange informal interviews with them. Use this opportunity to discuss your project, ask questions about their experience and approach, and gauge their communication skills and professionalism. Pay attention to their responsiveness, willingness to answer your questions, and their ability to understand and accommodate your requirements.

Trust your instincts: Consider your overall impression and gut feeling about the specialist. Building a positive working relationship is important, as the renovation project may span several weeks or months. Choose a builder you feel comfortable with, who communicates effectively and understands your vision.

Remember, selecting the right specialist builder is not solely about cost but also about their experience, reputation, and ability to deliver quality work. Take the time to conduct thorough research to choose a builder who best aligns with your renovation goals and values.

Extension and conversion ideas and costs

Loft conversion cost

A loft conversion is a fantastic way to add extra space to your home – whether it’s for an extra bedroom, office or playroom. Loft conversion costs typically range between £30,000 to £50,000, but can be higher for more extensive or luxurious conversions. Other factors that impact the cost include:

• The size of the loft
• The complexity of the project, including structural modifications, plumbing, electrical work, and insulation
• Whether you want additional features such as en-suite bathroom
• Where you live

The best thing to do is to get detailed quotes from builders who specialise in loft conversions that are specific to your project to get a more accurate understanding of the costs involved.

Garage conversion cost

A garage conversion is a great way to make use of the space rather than filling it with unwanted belongings – most people don’t even use them for their cars any more! You could convert your garage into a home gym, office space or even a granny annexe for your elderly parents. A garage conversion typically costs between £10,000 to £30,000, but can be higher for larger or more complex conversions. Other considerations to take into account include:

• The size of the garage, as a bigger one will increase the amount of materials used and labour time
• The purpose of the conversion will impact the cost – converting the garage into a living space with plumbing and electrical work will generally be more expensive than converting it into a simple home office or gym.
• Your location