50 Extension architects

Extension Architect

A home is one of the most precious assets a person can own. Taking care of it is akin to taking care of oneself. A true living space, a home adapts to the needs of its owners and sometimes requires work to be carried out — including the addition of an extension.

Whether built to gain extra living space, attached to the existing home, or added as an upper storey, an extension serves more than one purpose.

To achieve a functional home extension that matches your vision, a specialist architect is your greatest ally.

Why choose a specialist architect for your home extension?

An architect is not always mandatory for a home extension project. However, calling on this building, construction, and renovation professional brings a number of significant advantages.

An extension in harmony with your home
Adding an extension to your home comes with many challenges. The first is creating a space that is in perfect harmony with your existing home and living environment. Whether in terms of exterior or interior cohesion, working with an architect allows you to choose the type of extension, the materials, and the construction style — ensuring the new space integrates seamlessly with your home.

A project tailored to your budget
A home extension is a project that requires careful planning from the outset. Between site preparation, materials, and labour, expanding your living space requires a considerable budget.

An architect can assist you as the project manager. They design the plans, oversee the works, and coordinate the various tradespeople — all while working within your budget. The best way to avoid unwelcome surprises.

Achieving a functional and practical space
A home extension is more than just extra floor space attached to a main building or added on top of it. Above all, it must be functional and comfortable. Whether it's a conservatory, a garage, or an additional room, the specialist architect carries out the work so that the extension fulfils its primary purpose.

Insulation, natural light, electrical wiring, built-in storage — your new room is immediately ready to use.

Akira Yamanaka Architects (AYA) is a London-based architectural design studio founded by Akira Yamanaka, a RIBA chartered architect and a Certified Passive House Designer. AYA endeavours to provide functional, sustainable, aesthetic and economically viable design solutions tailored for each project utilising the most advanced digital design technologies, hand sketching and skilful craftsmanship.

13 property types

Single-Family Homes

Healthcare

8 types of work

Extension

New Build

3 services

Design / Plans

Planning permission application

Magri Williams is a dynamic, young studio founded by architects Joe Magri and Alice Williams. Based in London, the architecture studio specialises in crafting well-considered buildings with a focus on residential and interior design projects.

5 property types

Single-Family Homes

Hotels / Restaurants

6 types of work

Extension

New Build

3 services

Design / Plans

Planning permission application

Architect Kevin Gilligan is a member of the firm CEA Architects, a RIBA-chartered architectural practice with offices in Kent, London and Ireland. Founded in 2011, CEA Architects has built a reputation for producing innovative, well-designed homes that enhance the wellbeing of their clients.

3 property types

Single-Family Homes

Passive House / Eco-friendly

5 types of work

Extension

New Build

3 services

Design / Plans

Planning permission application

studioDA is an architecture, design and technology studio operated by three directors: Pereen d’Avoine, Nilesh Shah and Pierre d’Avoine. This studio places innovation and evolution at the heart of everything they do.

9 property types

Single-Family Homes

Offices

11 types of work

Extension

New Build

3 services

Design / Plans

Planning permission application

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Benchmark Architects is an architecture and design studio based in London and Ampthill. They pride themselves on the quality of their designs, and they are always looking to challenge the established order of what architecture can and cannot be.

6 property types

Single-Family Homes

Multi-unit Residential Buildings

7 types of work

Extension

New Build

4 services

Design / Plans

Planning permission application

John Kelshaw is an architect with an exceptional depth of experience acquired over 20 years in both the public and private sectors, from residential and commercial architecture to healthcare and community projects. His firm John Kelshaw Architects Ltd. is based in Oxton and Cheshire, offering full architectural services to clients throughout the UK.

5 property types

Single-Family Homes

Historical / Listed Buildings

9 types of work

Extension

New Build

3 services

Design / Plans

Planning permission application

Architect Charles Coull B.Arch.(Hons), Dip. Arch., RIBA is the Managing Director of the RIBA chartered practice Coull Architecture Ltd. based in London. Benefiting from the architect’s wide range of experience, the dynamic young studio is driven by a dual pursuit of quality in both the service they provide and the designs they create. 

10 property types

Single-Family Homes

Offices

5 types of work

Extension

New Build

4 services

Consulting

Design / Plans

Charles Mullineux Design places the client at the heart of everything they do. They are based in Cheltenham and work both within this city and throughout the Cotswolds.

3 property types

Single-Family Homes

Townhouse

6 types of work

Extension

New Build

4 services

Design / Plans

Consulting

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What sets this practice apart is its ability to combine award-winning design with a deeply personal approach. While many architects begin with buildings, the team begins with people—taking time to understand aspirations, lifestyles and long-term goals before putting pen to paper. Every project is

7 property types

Single-Family Homes

Hotels / Restaurants

8 types of work

Extension

New Build

4 services

Design / Plans

Planning permission application

Chris Heal Architecture is a professional studio providing an innovative and personal service to residential and commercial clients in Newcastle and across the North East. Extensions, renovations and new-builds - contact us for a free initial consultation. ARB | RIBA

7 property types

Single-Family Homes

Flats / Lofts

12 types of work

Extension

New Build

4 services

Design / Plans

Planning permission application