RIBA Plan of Work 

Stage 4 Specification & Design

Horizontal process diagram with arrow shapes and a central green “In a Flow Stage” step.

Successful low-energy building design relies as much on great design and specification as it does on an initial strategy and good intent. 

With low-energy buildings becoming ever-more complicated and integrated, a poor system design for heating, hot water, ventilation or power generation can quickly unravel into a complex and expensive mistake at the heart of the project.


Working with the wider design team and select technology specialists, the early-stage energy strategy planning and modelling can be used to create a more-informed and practical technical specification. Mesh Energy can effectively create a wide range of clear design documents useful for specifiers and installers alike to tender against.

Some of our most popular services include:

Tender stage specification and design for a wide range of renewable technologies

allows you to most accurately provide specific equipment requirements and can save time in the tender review stage as any deviations from the specification can be easily highlighted and interrogated. 

Full whole-house mechanical and electrical design

enables you to keep sustainable and other building-wide systems such as water distribution, ventilation, drainage, small power and lighting detail together and controlled by a single specialist. The holistic design can then be concisely documented and specified for contractors to accurately price against during the tender phase of a project.

Installer referral

offers an opportunity to reduce risk and make savings by finding qualified and reputable specialists for the job. Trusted installers can make all the difference in your project being a success.

Returned tender review

makes comparing tenders an easy task. Mesh unpacks what has been included compared to the specification and design and help you understand which offer the best value and quality.

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At whichever stage of your project you are, drop us a line and we will be glad to support you



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 Jen Wallace, Managing Director of building performance specialist Mesh
12 September 2026
Building performance and M&E engineering specialist Mesh has appointed Jen Wallace as Managing Director
Mesh - finalist for the Energy Efficiency Awards National Consultancy of the Year Award
15 August 2026
Building performance specialists Mesh have been announced as a finalist for National Consultancy of the Year at the Energy Efficiency Awards