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Over 12 Years of Experience

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From its glory days in the 70s ‘swinging London’, Chelsea has been the haunt of the affluent and the prime quarter for desirable living. Its properties are themselves a style statement and synonymous with undiminishable wealth. Anyone would think there is no room for improvement on the property front here. But, if you are a homeowner in this high-profile neighbourhood, you know how consequential house extensions Chelsea can be. From rocketing up your property value to giving you the space for your eclectic taste in design ideas, more space brings more joy.

We recognise the early craftsmanship and build quality of your period property, and our designs and construction always find the right balance of integrating the new with the old. Our years of expertise in remodelling Victorian and 1930s properties have provided us with invaluable insights into the process of creative and clever architectural transformation.

Single-storey and double-storey house extensions have multiple layouts.

Side Return – perhaps known for its minimal-fuss rearrangement, this extension is suitable for properties with an ‘original’ rear extension or an outrigger. It builds onto the narrow alleyway running alongside the rear of the house bordering the neighbouring property, with a new party wall serving as an interior wall. Since it is only a shaded underused area you sacrifice, it doesn’t affect much of your outdoor space.

Rear Extension – when you want to open up living space towards the outdoors for better natural light and ventilation, use a rear extension that sits at the back of your property. It extends your home onto your rear garden, expanding your floor area from one border wall to the other. It allows for enhanced open-plan settings for a kitchen/dining/sitting area, even extending to the outside for al fresco dining. You can re-organise your existing floor space by moving the living room, TV room, or even a bedroom to the extension.

Wraparound – if you have more garden space than usable interior space, choose two designs in one. Joining a Side and a Rear Extension is called a Wraparound because the design wraps around the side of the house in an L-shape. Along with a kitchen extension, you can also add a bathroom, WC, utility room, or an extra bedroom with this design.

Two-storey extension – sometimes the best way to give that square footage boost to your property is to build upwards. By doubling your chosen home extension with an additional level on top, you can save garden space and include more contemporary floor plan ideas.

House extensions that fall under permitted development do not need permission. While most extensions have PD rights, some do not if;

  • The house you are planning an extension for is within a conservation area or a listed building.
  • The extension covers more than half the land area of the property
  • Single-storey Rear Extensions extend more than 8m (previously 4m) from the original rear wall of the property if it is a detached house and 6m (previously 3m) if it is a semi-detached or terraced property.
  • A single-storey extension rises higher than 4m
  • Double-storey extensions are closer than 7m to the rear boundary.
  • The extension exceeds the highest part of the original roof.
  • The roof pitch and exterior are dissimilar to the existing house.
  • There are balconies and terraces

Combine a pitched roof with a flat one – the pitched portion, be the side or the middle of a Rear extension, adds more definition, especially when the original house has a pitched roof.

Use Velux roof windows – they are not just for your loft. Add Velux windows to your new addition, and existing space losing some of its light and ventilation to create airy and light-flooding rooms.

Indoor space that offsets garden loss – a garden room-inspired sitting room is a perfect solution when your much-loved outdoor space has to be compromised to build more interior space.

Our 100% bespoke designs drawn up by professional architects put your needs and your property’s hidden potential at the forefront. We do not just focus on structure; we also take pride in our interior design expertise. With planning and building teams well-versed in building regulations and guidelines, we make it our job to apply for planning permission to reduce your responsibilities. All our building projects come with a project manager who also coordinates with suppliers and local authorities. You will sign two contracts, not one, for the design and build phases for increased flexibility to decide.

The cost of house extensions varies due to several reasons. However, the basic costs of the average extensions in south-west London are as follows;

Single-storey Side Return – £35K

Rear extension – £40K

Wraparound extension – £55K

A two-storey extension starts from £75K

Build new spaces that combine function and style with elegant interiors. Get a free consultation and an itemised quote for house extensions and loft conversions from Good Design & Build.

Don't move. Extend in style

We can save you the hassle that comes with moving not to mention the heavy stamp duty! Adding an extra loft bedroom or enlarging the living kitchen dining space on ground floor is an economical way of transforming your home to suit growing needs. The projects can range from £40-100K depending on your requirements and can be completed within 8-16 weeks.

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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.

Featured Projects

Interior View - Sellons Ave Project

Harlesden

Sellons Ave NW10 4HJ

The project included creating a master bedroom in the loft with an adjoining terrace.

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Fulham

Orbain Road SW6 7JZ

This project was completed in 2023 and the approximate budget was £101,000.

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Kitchen Extension in East Sheen

Lambeth

Hetherington Road SW4

We completed this stunning project for our client Angus in Lambeth.

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Teddington

Station Road SW4 7PA

We completed this exciting project for our clients on Station Road, a quaint residential area in the heart of Teddington.

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Leyton

Windsor Road E10

We completed this kitchen extension on Windsor Road, a charming residential street nestled in the heart of Leyton.

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What Our Clients Say

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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

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