Before After
Drag to compare

A Considered Approach
to Rooftop Development

We work with existing buildings to create carefully integrated rooftop homes.

Ethos
Considered Design
Each extension is shaped by the building it sits on — its proportions, materials and setting.
Transparency
Clear communication and defined processes help keep projects structured and understandable for everyone involved.
Careful Delivery
Working on existing buildings requires sensitivity to residents, neighbours and the structure itself.
View Projects
Grade-Listed Mansard Extension
Cambridge
Completed
View Projects
Penthouse Residences
London
Live
Coming Soon
Four Rooftop Homes
London
Coming Up
The Practice

Our team is closely involved in every scheme from initial meet up to final delivery

Considering the potential
of your building?

About

Our
Story

The founders first met as students at university, brought together by a shared interest in the built environment and how buildings shape the places around them. Over a decade working across construction and development, a common idea remained: that existing buildings reveal more to those who take the time to understand them.

M&B Airspace was founded on that idea to create new homes above existing buildings by realising their untapped potential.

The founders remain closely involved throughout each project, from the first conversation to final handover.

Founders
Amien Bohwaish MCIOB
Founder — Development
Read more +

Amien is an experienced construction and development professional across residential and infrastructure projects in the UK. He has worked on the delivery of luxury and boutique residential and mixed-use schemes from early design through construction and completion, including projects involving the conversion and adaptation of historic and Grade-listed buildings.

He holds a Master's degree in Project Management for Construction and is a Chartered Member of the Chartered Institute of Building (MCIOB). At M&B Airspace, Amien leads development strategy, feasibility and design coordination.

Mohamed Mnili
Founder — Commercial
Read more +

Mohamed is a commercial and project management professional with a depth of knowledge in finance, cost planning and commercial management gained at some of the UK's leading residential developers and contractors — including Taylor Wimpey, Kier Group and Countryside. He has overseen procurement, viability and contract strategy across a range of residential schemes across London and the South East.

At M&B Airspace, Mohamed oversees financial planning, procurement and contractual matters across projects.

Senior Advisors

M&B Airspace is supported by senior advisors who have held leadership roles across some of the UK's most respected construction organisations, contributing additional oversight across programme planning and construction delivery.

David Hurricks FCIOB
Senior Advisor — Programme & Construction Planning
Read more +

David has spent several decades in senior construction leadership roles across residential and commercial developments, having held senior positions at ISG, Willmott Dixon and Morgan Ashurst. His experience spans programme management, logistics planning and construction sequencing across complex projects. He is a Fellow of the Chartered Institute of Building (FCIOB).

Chris Miller
Senior Advisor — Construction Delivery
Read more +

Chris has extensive experience in construction management and project delivery across residential developments. He has led site teams and managed building projects from early construction through completion. At M&B Airspace he advises on buildability and construction methodology.

Projects

Selected Projects

Cambridge
Completed

Cambridge

Grade-Listed Mansard Extension

A new mansard level created above a Grade-listed building in Cambridge, introducing an additional floor whilst working carefully within the constraints of the listed structure.

The mansard was designed to sit sensitively within the roofscape, with materials and detailing chosen to complement the historic character of the building below.

London
Live

London

Penthouse Residences

A rooftop development delivering two penthouse homes above an existing building in South London.

The design adopts a setback form, expressed in contemporary materials that sit comfortably alongside the original brick façade. Each residence opens onto private terraces with panoramic views, creating a calm, elevated living environment above the city, with sustainability considered throughout the design and delivery.

Coming Soon
London
Coming Up

London

Four Rooftop Flats

A rooftop development creating four new residential units above an existing building in North London, currently progressing through detailed design.

Further details will be shared as the scheme advances.

Our Approach

We keep the process straightforward and clearly structured from start to finish.

01
Understanding the Building and the Owner

Every project begins with a considered conversation. We take time to understand the building, its ownership and the owner's objectives, ensuring early alignment.

02
Feasibility

We assess the rooftop to understand planning context, structural capacity and massing potential, establishing what can realistically be achieved.

03
Agreeing the Way Forward

Where aligned, Heads of Terms are agreed and solicitors are instructed, setting out the key terms and timeline. We typically cover the owner's legal fees.

04
Design and Planning

We prepare surveys, design proposals and planning submissions. Following planning approval, we acquire the air rights from the owner, allowing them to realise the financial value of their asset.

05
Construction

Construction is delivered carefully within an occupied building, with clear communication and dedicated site management throughout.

06
Completion

On completion, warranties are provided and the project is handed over. For joint venture structures, value is realised by the owner through the sale of the new homes.

Ready to begin
a conversation?

Insights

Observations from Practice

Planning
Understanding Airspace Potential in Existing Buildings
Read Article
Planning
Planning Considerations for Upward Extensions
Read Article
Construction
Construction Within Occupied Buildings
Read Article
Viability
Evaluating Viability and Programme
Read Article
Contact

Let's Begin with
a Conversation.

Office
London, United Kingdom
Website