Bespoke Design & Planning

Over 12 Years of Experience

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Full Cost Transparency & Project Management

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Home extensions are a great way to add style and space to your home without incurring the heavy cost of moving houses. And though a lot of thought does not usually go into considering the roof type, it is actually a crucial aspect of the extension design.

Pitched roof extensions have the ability to transform the living space into a brighter, airier, and more expansive area that allows for the creation of multiple rooms. This versatility and aesthetic appeal make pitched roof extensions an easy favourite among homeowners.

Want to know more? Read on below!

A pitched roof extension refers to a type of home expansion that involves extending the existing roof structure of a building with a pitched or sloping roof design. 

A pitched roof is characterised by its sloping sides, which meet at a central ridge. In a pitched roof extension, the new section of the building is constructed with a roof that matches the same pitch and style as the existing roof. This design choice ensures visual continuity and architectural cohesion.

Pitched roof extensions offer several advantages. For example, they allow for the creation of additional living areas, such as bedrooms, bathrooms, home offices, or playrooms, while maintaining a consistent roof style throughout the property. Pitched roofs also provide effective rainwater drainage and can accommodate loft or attic spaces, allowing for further functional use or storage.

While the eventual cost of the extension is based on a number of factors, including the design and dimensions of the extension; the cost of a pitched roof extension can range from £55K to £70K.

We offer free consultations and detailed, itemised quotations for proposed extensions, which allows homeowners to plan and design their home extensions at their intended budgets.

A pitched roof extension has the potential to transform the style, value, and appeal of your home. As such, it is crucial that the design, planning, and construction of a pitched roof extension should be carried out by professionals, such as architects and contractors, to ensure structural integrity, compliance with building regulations, and successful integration with the existing property.

Apart from that, 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.

By considering the process involved, and the comprehensive planning and management required, it is vital to choose the right home extension specialists.

We believe that every home is unique. With decades of experience and a collaborative working style, we provide bespoke designs for all types of extensions. Our project management services are tailored to your needs and will help us deliver the best project of your desire.

Our experienced team comprises architects, interior designers, surveyors, builders, technicians, and project managers; ensuring that every aspect of the design and build is carefully implemented.

We understand that an extension is not just an additional space but it is a place where the family comes together creating memories and savouring every moment. So, we strive to deliver an extension that exceeds your expectations.

While home extensions are a cost-effective alternative to acquiring more living space without moving houses; the cost of a house extension itself is dependent upon a number of variables including:

  • The design/ complexity of the extension
  • The size of the extension
  • The location
  • Groundwork
  • Building Materials
  • Fittings and fixtures
  • Specialists’ fees

As such, pitched roof extensions may range in cost from £55K to £70K.

Therefore, it is imperative to find the right experts who ensure that the extension adds style and value to your home, making your home extension a truly worthwhile investment.

Not necessarily.

The requirement for planning permission for an extension depends largely on the design and dimensions of the build. More often than not, if the extension falls under permitted developments, planning permission is not required.

However, permitted developments have specific criteria and limitations which must be adhered to, such as:

  • Extensions must not take up more than half the land around the original house
  • Extensions cannot be higher than the highest part of the existing roof
  • Materials used for the exterior of the extension must be similar in appearance to that of the exterior of the original house
  • Side extensions can only be single-storied and cannot exceed more than half the width of the original house

Moreover, extensions built on properties listed in conservation areas will need planning permission irrespective of their design. The planning portal provides homeowners with comprehensive information regarding any requirements or specifications for their proposed extensions. 

Planning permission can take up to 8 weeks for approval and requires a detailed application including structural diagrams of the proposed extension. In addition to planning permission, building regulations approval and party wall agreements must also be considered to ensure that the proposed extension meets the building guidelines and standards.

Good Design and Build oversees this entire process for our clients. From the primary survey of the location and the design of the proposed extension to coordinating with the local council and securing the requisite approvals. This allows homeowners to experience the extension process stress-free.

Though viewed as a relatively costly roof design, pitched roofs bring with them many advantages. Some of which include:

  • Pitched roofs blend better with traditional houses, making them more favoured by planning departments.
  • A pitched roof provides more insulation (allowing you to keep energy bills down).
  • Pitched roofs tend to have a longer lifespan as they are more weather resistant.
  • The increased ceiling height offered by pitched roofs creates an interior that appears airier and more spacious.

We do it all.

From surveying the site and securing building approval to designing tailored extensions and ensuring regular on-site management of the build, we oversee every aspect of the process from start to finish, ensuring a stress-free experience for homeowners.

This goes without saying but there’s complete transparency, accountability, and flexibility throughout the extension process, as we design high-quality home extensions that are specific to our client’s requirements, and come backed by warranties.

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.

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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.

Get Started