House Extensions in Edinburgh & the Lothians

A complete extension service from first idea to finished build, with greater cost certainty built into the process.

A More Complete Way to Plan Your Extension

A successful extension depends on more than good building work. It needs the right design, technical input, budget guidance, project management and trades all working together from the start.

The Brunstane Group brings these elements together through one joined-up team, helping you move from early feasibility to detailed pricing and the finished build with greater clarity and confidence.

This means fewer assumptions, better communication and a clearer understanding of what your project involves before work begins.

Greater Cost Certainty Before You Build

Many extension quotes are based on limited information, which can lead to assumptions, missing details and unexpected costs later in the project.

At The Brunstane Group, we take a more considered approach. By involving the right people early, including architectural support, engineering input and a Quantity Surveyor, we can build a clearer picture of the full project scope before detailed pricing is prepared.

This helps give you a fairer, more accurate understanding of the investment required and greater cost certainty across the agreed scope of work.

Discuss Your Extension Budget

The Brunstane Team Behind Your Extension

Your extension is supported by a joined-up team of experienced professionals who understand how each stage of the project connects.

Rather than working separately, our team works together to align the design, structure, budget and build from the outset.

Architect

Develops the design, prepares drawings and supports the planning and building warrant process.

Structural Engineer

Provides technical input on structural requirements, including openings, steelwork and load-bearing elements.

Quantity Surveyor

Once your building warrant is approved, our QS prepares a Bill of Quantities to support clear, accurate project pricing.

Contracts Manager

Oversees the build, manages the programme and coordinates the trades on site.
Meet the Team

Our 6-Step Extension Process

Our process is designed to give you a clear, structured route from first conversation to completed extension, with greater cost certainty built in before the build begins.

1
Initial Consultation & Feasibility

We discuss your home, your goals, how you want to live, your budget expectations and what may be possible.

2
Design & Planning Review

We look at the design approach, planning considerations and the professional input your project may require.

3
Technical Detail & Building Warrant

Architectural and engineering details are developed to support the building warrant process and prepare the project for accurate pricing.

4
Bill of Quantities Prepared by Quantity Surveyor

Our Quantity Surveyor prepares a Bill of Quantities, setting out the measured work and scope required for the project.

5
Cost Certainty Pricing

Once the approved drawings and Bill of Quantities are in place, we can provide cost certainty pricing based on the agreed scope of work. This means your project is priced properly, using detailed information rather than assumptions or rough estimates.

6
Programme Agreed & Build Managed

Your Contracts Manager agrees the programme, coordinates the trades and manages the build through to completion.

Extension Projects We’ve Delivered

See how we have helped homeowners across Edinburgh and the Lothians create more space, improve their layouts and stay in the homes they love.

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Lawrie Reilly Place

Lawrie Reilly Place

Multiple home extensions designed to give one family the space they needed without moving.

View Project

Bonnyrigg

Bonnyrigg

A single-storey extension and garage conversion creating a more open, practical family home.

View Project

Newhailes Avenue

Newhailes Avenue

A single-storey extension creating a brighter open-plan kitchen and living space.

View Project

Hear from Homeowners who chose Brunstane

Don’t just take our word for it, hear directly from homeowners who trusted The Brunstane Group to improve their home.

Types of Home Extensions We Build

Every home is different. Whether you need more space for family life, entertaining, working from home or simply making your property more practical, we can help you explore the right extension for your home.

Single-Storey Extensions

Single-Storey Extensions

A popular way to create larger kitchens, open-plan living areas, dining spaces or improved access to the garden.

Double-Storey Extensions

Double-Storey Extensions

Ideal for homeowners who want to add space upstairs and downstairs, creating more flexibility across the whole property.

Wraparound Extensions

Wraparound Extensions

Maximise the potential of your home by combining rear and side extension space to create a larger, more open-plan layout.

Kitchen & Living Extensions

Kitchen & Living Extensions

Transform the heart of the home with a brighter, more spacious kitchen, dining and living area designed around everyday life.

Sunrooms

Sunrooms

Bring more natural light into your home and create a comfortable space that connects your indoor and outdoor living areas.

Garage Conversions

Garage Conversions

Make better use of existing space by converting your garage into a more practical room for family life, work or storage.

Wherever you are in the process, we can help

Whether you are just starting to explore what is possible, already have drawings in place or are ready to move towards cost certainty pricing, The Brunstane Group can help guide your project forward.

To help us understand the right next step for you, it is useful to tell us:

  • What you want the extension to achieve
  • The type of space you would like to create
  • Whether you already have drawings, planning permission or a building warrant in place
  • Your approximate budget expectations
  • Your preferred timescale
  • Whether you are looking for a complete service from feasibility to finished build
  • How important cost certainty is to your decision-making

Ready to take the next step?

Wherever you are in the process, we can help you understand the right next step.

Complete the form belowon the right and tell us a little more about your home, your plans and what support you need. The more detail you can provide, the better we can guide you towards feasibility, design, planning, cost certainty pricing or the build itself.

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Step 1 of 3

Tell Us About Your Extension Project

Do you own the property?*

What type of extension are you considering? (choose one)*

What are you looking for help with? (choose one)*

What stage are you currently at? (click all applicable)

House Extension FAQs

The cost of a house extension depends on the size, design, specification, structural requirements and complexity of the project. Rather than providing rough estimates too early, our process is designed to understand the full scope of the work before cost certainty pricing is provided.
Cost certainty pricing means your project is priced using detailed information, including approved drawings, technical details and a Bill of Quantities. This gives you a clearer and more accurate understanding of the investment required across the agreed scope of work.
A Bill of Quantities, or BOQ, is an itemised document prepared by a Quantity Surveyor. It sets out the measured work, materials and scope required for the project, creating a clear basis for accurate pricing.
A BOQ helps reduce assumptions, omissions and guesswork. Instead of pricing from a rough idea, your extension is priced against a detailed scope of work, helping to provide fairer, more accurate pricing and greater cost certainty before the build begins.
A rough quote may seem helpful at first, but if it is not based on approved drawings, technical detail, specification and measured quantities, it may not reflect the true cost of the project. This can lead to changes, omissions or unexpected costs later.
Cost certainty applies to the agreed scope of work. If the scope, specification or design changes, or if unforeseen issues are uncovered during the build, costs may change. However, our process is designed to minimise uncertainty by pricing the project properly before work begins.
No. We can help from the early feasibility stage through to design, planning, building warrant, pricing and build. If you already have drawings or permissions in place, we can also review where you are in the process and advise on the next step.
Some house extensions require planning permission, while others may fall under permitted development rights. This depends on your property, location, the size and position of the extension, and whether any restrictions apply. Listed buildings, conservation areas and previous planning conditions can also affect what is allowed. As part of our process, we can help you understand what may be required before your project moves forward.
In most cases, a building warrant will be required for a house extension in Scotland. A building warrant confirms that the proposed work has been assessed against the relevant building standards before construction begins. We can support this process as part of our wider extension service.
No. Planning permission relates to whether the development is acceptable in planning terms, including its size, position and impact. A building warrant relates to building standards and confirms that the proposed work meets the required technical standards. Depending on your project, you may need planning permission, a building warrant or both.
If your property is listed or located in a conservation area, additional permissions or restrictions may apply. This can affect what can be built, what materials can be used and whether listed building consent is required. We can help identify these considerations as part of the early project review.
Your project can involve an Architect, Quantity Surveyor, Structural Engineer, Contracts Manager and experienced trades. These roles work together as one joined-up team, helping to align the design, technical requirements, budget and build.
Yes. The Brunstane Group provides a complete extension service, from early feasibility and professional support through to project management and the finished build. This gives you one team managing the process from start to finish.
We work with homeowners across Edinburgh, the Lothians, Fife and surrounding areas.
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Customer Testimonials

"Marc has done a great job, we are really please with the quality of his workmanship and the product. My wife commented how tidy he'd left the place too and to tell you he was a credit to the company."

Gordon

"Tony and his staff are a credit to their trade. Building dreams for you to realise. Brilliant from the first shovel in the ground to tony cleaning my windows to finish the job. Just brilliant."

Jimmy Pike

"Tony and his team were excellent. Helpful advice throughout, great attention to detail and excellent communication. The on-site team were brilliant and jimmy the joiner is a legend. Really high level of finish and costing were all as expected and agreed. Delighted with the process, build and outcome."

Andy Anderson

"We are delighted with our new extension, from the initial design stage, Tony listened to our needs and provided the sound advice. I would not hesitate to recommend this company, the advice we were given as well as the support throughout was invaluable."

John Kramer

Call us now for a FREE feasibility study and budget cost analysis

0131 510 9390

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