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When your much-loved home falls short on space, there is nothing else for it except to extend. Because of rising property prices, stamp duties, and the sheer cost and inconvenience of moving houses, it is always smarter to extend rather than relocate. 

However, if you are living in London, you already know the perils of not having much garden space to begin with. But what if you could extend your home without using up any valuable garden space? 

We present the single-storey garage extensions that allow you to upsize and expand your home in a way that is quick, cost-effective, and largely undisruptive.

A single-storey garage extension is basically an easy way to convert your often ill-used and cluttered garage into a beautiful and usable room that adds space and value to your home. It offers the ideal combination between a single-storey extension and a garage conversion, in that, most of the structure is already in place, but the design options are virtually limitless.

Garage extensions offer numerous options and interesting possibilities in how the newly created space is utilised. Their use often depends on the amount of space created within and its integration with the rest of the structure. Some innovative ideas for the newly converted garage include:

  • Extra bedroom (with an en-suite bathroom)
  • Home office
  • Utility room
  • Playroom
  • Home library/ Reading nook
  • Games room
  • Home cinema
  • Studio/ workshop
  • Den
  • Home gym

The possibilities are virtually limitless.

However, all these options need to take into account certain practicalities of the design. Often though, garage extensions tend to be designed as extensions of the kitchen, or of an open-plan living area; both of which add great value to your property.

And in order to unlock the immense potential of the garage space, it is also crucial to get creative with its design. How?

  • Optimising the natural light that enters through well-placed windows
  • Converting awkward corners into useful storage spaces with the addition of shelves
  • Arranging furniture to match the headroom requirement for each area
  • Adding feature walls to highlight design features and add more depth

The cost of designing and building a single-storey garage extension in London can range anywhere between £15,000 to £75,000. This is mainly because the cost is dependent on a large number of factors including:

  • The size of the extension
  • The design/ complexity 
  • Location
  • Groundwork/ Installations
  • Building materials
  • Fittings and fixtures
  • Specialists’ fees

Naturally, the type of extension and room built plays a large role in the final cost of the building. For example, creating a bathroom or kitchen extension with all the plumbing requirements and fittings would be more expensive than designing a modest home office. 

However, it is equally important to realise that garage extensions still work out to be much cheaper than other home extensions.

It may seem like an easy fix, but garage conversions and extensions involve numerous complex factors and practicalities, all of which must fall in line perfectly to create your ideal space.

And while you may be concerned about the cost of hiring experts, the decision to design and build an extension without professional help could prove to be much more costly. 

This is because a professional team will drastically increase your chances of success by helping you to:

  • Plan and design the ideal extension 
  • Avoid common errors and design flaws
  • Optimise the space to fit your specific requirements or styles
  • Choose the right design that is suitable for the space
  • Understand and advise you on the feasibility of the plan by considering the area, cost and availability of building materials, environmental factors, and building guidelines
  • Oversee all aspects of the build including technical work and installations

Quite simply, an experienced and expert team can help convert your dream extension into  an easy reality.

A garage extension is an incredible opportunity to add space and value to your home provided it is done right. To create the perfect extension that proves worthy of investment, it is imperative that the best home extension specialists are consulted.

This is where Good Design & Build comes in. 

We are the primary extension builders in London that specialise in designing and creating bespoke home extensions and conversions. With decades of experience and unmatched expertise, we provide complete project management from start to finish. This means we offer:

  • Free consultations and quotations for proposed extensions
  • Survey of the location
  • Architectural designs
  • Contractual work
  • Technical expertise
  • Daily on-site management of the build

And so much more.

Our incredible team comprises of surveyors, engineers, architects, builders, technicians, and project managers, enabling us to create high-quality extensions that are backed by warranties which allow you to enjoy a truly stress-free experience.

A better question would be what is not, because we do it all! 

This includes everything from the initial survey of the location, planning and designing the extension in minute detail, applying for and securing the requisite legal permits and approvals, and managing the daily on-site work.

Our incredible team includes architects, builders, technicians, and project managers. This enables us to oversee every aspect of the extension project from start to finish.

With decades of experience, unmatched expertise, and unparalleled skill, we create the best, bespoke extensions of exceptional standards, which come backed by warranties.

We also go above and beyond to provide you with a stress-free experience that ensures you get a new space that is perfectly aligned with your vision, as well as your budget.

Looking for some inspiration? Check out our completed projects for the incredible stories and visions that we have brought to life.

https://www.gooddesignbuild.co.uk/completed-projects/

Not necessarily. Most garage extensions and conversions fall under permitted developments and therefore do not require planning permission.

However, there are some exceptions to this rule. These include:

  • Flats and maisonettes
  • Properties listed in conservation areas
  • Properties in new housing developments
  • Detached garages that need to be attached to the main residence
  • Garages that are intended to be built as separate residences
  • Garage extensions that require external work including enlargement of the structure

For a more comprehensive understanding of the requirements for planning permission and the specifications associated with permitted developments, property owners could also visit the planning portal or consult their local planning authority.

Party wall agreements and building regulations approval must also be considered to ensure that the proposed extension design meets building guidelines and standards.

The cost of designing and building a single-storey garage extension in London can range from a modest £15,000 to a more extravagant £75,000 due to the myriad of factors and elements involved.

These factors include:

  • The size of the extension- Bigger the build, the higher the cost; as more materials, labour and time are required.
  • The design of the extension- If the space created is to be used as a utility room, kitchen extension, or bathroom, then the cost for connection of utilities, plumbing requirements, and installation of the fittings need to be considered.
  • Any reinforcements necessary- Such as for load-bearing walls, the floors, and the foundation
  • Cost of doors, windows, flooring, and finishes- Here, the cost largely depends on the type and size of the materials
  • Labour costs- Hourly or daily rates of the builders and technicians
  • Legal requisites and approvals such as planning permission fees, building regulations approval, party wall agreements, etc.

Good Design and Build offers free consultations and quotations that allow you to create a bespoke budget for your bespoke build. For more information, check out the link below:

https://www.gooddesignbuild.co.uk/cost-guide/

How we deliver projects

Our process is simple and divided into two distinct phases with separate contracts: Design and Build. As a client you only commit to one phase at a time depending on what stage of the process you are in. Each phase consists of three stages as described below.

1. Design

This is the kick-off point for your project. We carry out a complete architectural measured survey of the property. This allows us to create accurate CAD design drawings. This is followed by a design meeting to start discussing your ideas in more detail.

2. Planning

At this stage we finalise the designs with you and start preparing planning applications as needed. We place a high priority on ensuring that plans, designs and schedules are all based on a thorough and detailed understanding of planning guidelines. We co-ordinate with local authorities until the decision is made, and the planning approval is secured.

3. Technical

Once the planning consent is secured, we translate the design drawings into more detailed technical drawings for the purposes of building control and construction. This also includes specifications and structural calculations. At this stage, we will also submit to you our ‘no obligation’ quote for the build phase.

4. Pre-build

90% of our clients decide to stick with us after the design phase is completed. Once the build contract is signed, we kick off the process by making sure all the pre-build processes are complete. These include assistance with party wall agreements, Thames Water build over agreement, submitting building control application, and preparing method statements etc as needed. This stage ends with a pre-start meeting with your foreman before the actual build begins.

5. Build

One of our foremen will be dedicated to your project and will be on-site to manage everyday works. Our project managers will be overseeing the works to make sure they are completed to high standards, within your budget and on time. Throughout the process we will keep you updated with the progress and coordinate the works with third parties such as kitchen or flooring suppliers. We will also advise and guide you to choose any suppliers if needed.

6. Handover

As the build draws to finish, we will help to iron out any ‘snags’ to make sure everything is completed to your satisfaction. We will put together all necessary certificates such as gas, electricity and building control completion along with warranties for glazing, boiler etc. At the final completion meeting, we will hand you these documents, together with the keys to your house. Needless to say, you can contact us any time after this, if you want us to look at something.


This is the kick-off point for your project. We carry out a complete architectural measured survey of the property. This allows us to create accurate CAD design drawings. This is followed by a design meeting to start discussing your ideas in more detail.

At this stage we finalise the designs with you and start preparing planning applications as needed. We place a high priority on ensuring that plans, designs and schedules are all based on a thorough and detailed understanding of planning guidelines. We co-ordinate with local authorities until the decision is made, and the planning approval is secured.

Once the planning consent is secured, we translate the design drawings into more detailed technical drawings for the purposes of building control and construction. This also includes specifications and structural calculations. At this stage, we will also submit to you our ‘no obligation’ quote for the build phase.

90% of our clients decide to stick with us after the design phase is completed. Once the build contract is signed, we kick off the process by making sure all the pre-build processes are complete. These include assistance with party wall agreements, Thames Water build over agreement, submitting building control application, and preparing method statements etc as needed. This stage ends with a pre-start meeting with your foreman before the actual build begins.

One of our foremen will be dedicated to your project and will be on-site to manage everyday works. Our project managers will be overseeing the works to make sure they are completed to high standards, within your budget and on time. Throughout the process we will keep you updated with the progress and coordinate the works with third parties such as kitchen or flooring suppliers. We will also advise and guide you to choose any suppliers if needed.

As the build draws to finish, we will help to iron out any ‘snags’ to make sure everything is completed to your satisfaction. We will put together all necessary certificates such as gas, electricity and building control completion along with warranties for glazing, boiler etc. At the final completion meeting, we will hand you these documents, together with the keys to your house. Needless to say, you can contact us any time after this, if you want us to look at something.

What Our Clients Say

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Let's get started with building your own bespoke quote for your dream extension. Tell us as much in detail as possible to get most accurate price.

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Build a Quote!

Let's get started with building your own bespoke quote for your dream extension. Tell us as much in detail as possible to get most accurate price.

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