Bespoke Design & Planning

Over 12 Years of Experience

Free Consultation & Itemised Quotes

Full Cost Transparency & Project Management

Insurance Backed Warranty

Expand your living space, bask in natural light, enjoy panoramic views, and create a wonderful new room within your home that allows you to feel connected with the outdoors throughout the year, regardless of the weather.

All of this becomes an easy reality with sunroom extensions that help you enjoy a brand-new space and setting, right within your own home.

Want to know more? Get in touch with the extension experts today!

A sunroom extension is essentially an addition that is designed to optimise the natural light within a home while creating incredible indoor-outdoor connections.

The design of the sunroom can vary depending on individual needs and requirements. This means that a sunroom serves as a versatile and multipurpose area that may be used as a relaxing lounge area, a dining space, a home office, a playroom, or a greenhouse for plants. 

Similar to a conservatory, a sunroom generally features large windows or glass walls to allow ample sunlight to enter the space. However, the style may be adapted to enhance the privacy of the space through a combination of windows, insulated glass panels, and solid walls. 

In this way, a sunroom extension creates a bright and welcoming space that allows you to enjoy the outdoors while providing protection from the elements.

A sunroom extension can range in cost from a modest £40K to a more extravagant £60K.

This is because the cost of the extension is determined by a variety of factors including the size of the extension, cost of building materials used, complexity of design, etc.

Though it may seem a relatively simple and straightforward project; a sunroom extension has the potential to drastically change the space, design, charm, and value of your home. Therefore, it needs to be planned, designed, and handled with utmost care.

This is where the experts come in.

How can they help? In any and every way. 

The expertise and experience of a professional team can help you to optimise the potential of the design and space while enabling you to avoid the many common mistakes that could prove costly in the long run.

And while you may be concerned about the cost of hiring experts, the decision to design and build an extension with professional help will drastically increase your chances of success by helping you to:

  • Plan and design bespoke extension.
  • Work closely with you to understand your vision, your budget, and your timeline.
  • Project management driven solutions tailored to your needs.
  • 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, form planning and design to construction and final touches.
  • Help with cost saving by providing deals with partner material suppliers.
  • Avoid common errors and design flaws.

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

At Good Design & Build we believe in turning dreams into reality. With our collaborative working style, our team of experts are with you every step of the way and strive to get the outcome of your desires.

With our collaborative working style our team of experts are with you every step of the way and strive to get the outcome of your desires. 

Our services include everything from the initial survey of the location and designing the extension in comprehensive detail, to post-build contractual work and coordinating with the local building authorities. 

This means that we not only create extensions that exceed the expectations (that come backed by warranties) but also help homeowners enjoy the journey and have a hassle-free extension experience.

As with any construction project, the eventual cost of the extension is determined by a large number of factors including:

  • The size of the extension
  • The design of the extension
  • Building materials 
  • Location
  • Groundwork involved
  • Renovations/ repairs required
  • Ventilation/ heating requirements
  • Fittings and fixtures
  • Labour costs
  • Specialists’ fees

We offer free consultations and detailed, itemised quotations for proposed extensions that allow homeowners to get started.

Not necessarily.

In terms of planning permission, sunroom extensions are considered alongside other single-storey extensions. This means that if the extension falls under permitted developments, planning permission will not be required.

However, the extension has to meet the specific criteria of permitted developments such as:

  • Extensions must not exceed more than 4 metres in height
  • Extensions cannot extend beyond 3 metres from the rear wall of the original house

Similarly, other limitations of size, permitted structures, and building materials need to be considered. As many of these parameters are specific to the type of property and the type of extension planned, it is best to consult the Planning Portal for guidance on local regulations.

In addition to planning permission, building regulations approval also needs to be taken into account to ensure that the extension build complies with all the building guidelines and regulations.

We do it all.

Our experienced team of surveyors, architects, interior designers, builders, technicians, and project managers, are with you every step of the way. We provide project management driven services from start to finish. This includes (but is not limited to):

  • Primary survey of the location
  • Architectural design of the extension
  • Coordinating with the local council
  • Regular on-site management of the build
  • Contractual work

It is important for us to help our clients enjoy their home extension journey and have a hassle free experience throughout the process.

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

Featured Projects

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.

Get Started

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.

Get Started