Blog Layout

Is it possible to build an eco home on a budget? Mesh Energy explains

Doug Johnson • 13 August 2020

With popularity growing around sustainability and low-energy living, a question we are getting asked more frequently is: “Is it possible to build a sustainable, low-energy home without spending mega money in a Grand Designs style?” The good news is… yes, it is! Your eco home might not be as expensive as you had imagined.


But, first of all, you have to figure out what you mean by ‘eco home’. All of us have our own,  different definition. Some would like to use less electricity by turning our lights off more frequently, whereas others want to generate all their own energy and live off grid in a house made from materials that have been sourced from the same village! So, the first problem is that there is no fixed definition. Whatever the threshold and aspiration, I think most would be interested to know that their hard-earned money was being spent in the most cost-effective way possible to reduce energy use.


Spoiler alert…replacing your gas boiler with a heat pump is not the solution (at least in isolation)!


Let’s start at the beginning and go back to basics. Here at Mesh, we have created an Energy Saving Hierarchy model which uses good old fashioned common sense and building physics to help you best spend money reducing costs regardless of whether you are building your dream home or an office block.


There are six key areas to consider:

  1. Building Location, Orientation & Form – Focus first on reducing energy by using fundamental building physics and the natural environment to complement the home design and reduce energy use at the most fundamental level
  2. Fabric Element Design – Reduce heat loss and energy use by ensuring the key passive fabric elements of the home are optimised
  3. Air Tightness & Ventilation – Minimise uncontrolled air leakage in and out of the building and manage ventilation efficiently by harvesting waste heat wherever possible
  4. Renewable Technology – Ensure the heat and power you need for the home are produced as efficiently and sustainably as possible using technology that harvests energy from the natural environment
  5. Appliances & Lights – Installing energy efficient lighting and consumer goods which are efficient and have the ability to be intelligently controlled in the future to further reduce energy usage
  6. Use – Finally, behavioural energy saving by client which reduces and optimises the way the home is used to maintain total comfort but minimise unnecessary wastage of energy and resources


The Mesh Energy Saving Hierarchy

The Mesh Energy Saving Hierarchy

At the top level is the greatest opportunity to reduce energy by using building location, orientation and form, using the power of physics in the natural environment.


Cascading through the stages of improving fabric element design, airtightness, renewable technologies and lighting and appliances provides a practical framework for approaching building design.


At the bottom lies building usage by the end user which only has a marginal effect on energy usage once the fabric and key technologies for the home have been implemented. By following these steps and optimising each level, the project will naturally remain focused on energy efficiency and focus the design teams mind on the highest of design priorities to retain low energy building principles. 


Building Design Sweet Spot


With the Mesh Energy Hierarchy as a framework, you now have a clear prioritised list on which to focus. As the levels are arranged from greatest energy saving potential at the top to least at the bottom, optimising each one in turn will yield the greatest energy efficiency returns for the project.


As with optimising anything, there is the law of diminishing returns to consider and there is a point where further improvements in any one of these stages leads to greater increases in relative capital costs versus the practical benefit the additional design change delivers. A good example of this is optimising the ‘Fabric Element Design’ level. Increasing the wall thickness of a building to drive down its U-value and reduce its heat loss is fine initially but as you add insulation to improve the situation further, costs rise, room sizes reduce and proportionally the insulation level of that element does not reduce as much.


For those of you who have been patient enough to get this far through the blog post, let’s reward you with some solid numbers. We recently ran a webinar and looked at the cost uplift from a ‘standard’ home built to Building Regs to that near Passivhaus and RIBA 2030 Climate Challenge targets.


New build homes built to current Building Regulations cost between £1,800 and £2,500 per square metre depending on the construction method and quality of finish sought. So, for a 250 sqm home this would be about £450,000 to £625,000 build cost.


If you assume the form of the home is fixed and you focus on the insulation, air tightness and renewable technology of the building to dramatically save you energy, you can factor in about £185 per sqm uplift for reducing your running costs by around 45%. When all is said and done, if you factor in a 5% build cost uplift for reducing running costs by 30% and 8-10% build cost uplift for reducing running costs by 45%, you won’t be far off.


As we rapidly embrace low-energy construction and thinking, the costs of building what we now call eco-homes will become the norm and there will be no such thing as price uplift, it will simply be the cost of building to save our planet.


If you still have any questions about your dream low-energy home,
please don't hesitate to
contact the Mesh team today.

SHARE THIS POST WITH YOUR NETWORK

by Doug Johnson 24 March 2025
Mesh Team Blasts Half Marathon for Cancer Charities
by Doug Johnson 24 March 2025
Offsite housing specialists TALO and building performance consultants Mesh Energy have announced a collaboration agreement to accelerate the delivery of ultra-low energy homes. The collaboration will combine TALO’s advanced timber superstructure technology from Finland with Mesh’s experience of providing net zero building performance and engineering services for housebuilders, architects and residential property developers. Working closely together, TALO and Mesh will aim to significantly increase the energy efficiency of new homes for market sale, rent and affordable housing, exceeding both Passivhaus energy standards and Future Homes standards, in compliance with the latest regulations. Doug Johnson, Director of Mesh Energy: “TALO’s timber superstructure solutions for low rise housing are the very best we have seen in the UK in terms of energy efficiency, air tightness, cost and quality. Their latest projects are achieving at least a 30 per cent improvement on Passivhaus energy standards and at no cost premium. We don’t believe there is anything like this on the market today and yet it is very needed. Some of the biggest issues facing housebuilders and developers are managing risk and addressing skills shortages. TALO’s system addresses both of these challenges extremely well. New regulation is coming which will make it increasingly difficult for developers to balance the rising cost of building new homes to the required energy and air tightness standards and the risk of non-compliance. New homes simply need to perform better. And yet the risk for developers is in the fabric and performance of each home. Our new collaboration will give housebuilders the benefit of much greater certainty of delivery to the required quality, air tightness and energy standards from the inception of a project. Our work on the energy strategy, data and compliance will support TALO’s extremely efficient way of building new homes to reduce risk for residential property developers.” TALO and Mesh have already collaborated on a number of projects. Under the new agreement, both businesses can leverage their respective experience to enhance the efficiency and economics of new residential projects. Dr Anthony Greer, Corporate Strategy Director of TALO said: "Our vision is to transform UK housebuilding by taking proven technology which has been used to build thousands of units in the Nordics – in one of the most extreme climates in the world. Our goal is to address some of the difficult problems that have been challenging the UK construction industry for many years – skills shortages, speed of delivery, sub-standard quality, and poor energy efficiency. Our ultimate goal is the offsite construction of high quality, ultra-low energy homes that can eradicate fuel poverty and snagging. By radically reducing time on site, developers can achieve a faster return on investment. They need fewer trades on site because we are using highly efficient offsite technology. Our processes are entirely dry – from forest to site – which means better air tightness performance and more accurate programme scheduling for the fitout phase to further reduce risk. Homes built by TALO exceed Passivhaus energy and air tightness standards at no cost impediment. This means homeowners and tenants will have hugely reduced energy costs that are verified by A-rated EPC certifications. Our housebuilding solutions will be enhanced with our collaboration with Mesh, helping to solve the technical and economic challenges that are constraining the sector and compounding the housing and cost of living crises.” In the new arrangement, Mesh will provide the energy strategy, data analysis and compliance work to support TALO’s delivery of the offsite superstructures for low-rise housing projects – which range from terraced housing, semi-detached family homes and larger executive schemes for developers and housebuilders across the UK.
by Pablo Jiménez-Moreno 29 April 2024
Discover the critical role of a feasibility study in integrating renewable technologies into your home. Learn how to make informed decisions for sustainable living.
by Doug Johnson 11 January 2024
As we come out of our end of year hibernation period for 2023 and try to both digest and interpret what 2023 had in store for us, how we dealt with it, and what we would change if we could; we drag ourselves out into the blinding light of 2024 and hope for a less tumultuous year in the UK’s sustainable construction sector. I am an optimistic person and ‘glass half-full thinking’, as well as doing my best to gaze into the future, is my default position. When working with a team on the sharp end of sustainable building design, there are some trends which simply cannot be ignored and hold great promise for 2024. The following trends are in areas we’ve seen growing design time and client fees being spent to great effect, and that’s why these are my top four sustainable construction prediction of 2024.
by Doug Johnson 7 December 2023
In recent years, sustainability has seen a massive increase in priority within the construction industry. As climate change and its effects worsen around the world, architects, builders, and developers are now feeling more compelled to adopt more environmentally friendly practices. While pursuing sustainable building design is definitely a commendable course of action, the process itself has its own set of challenges; introducing potential risks to the construction industry that must be addressed.
by Rebecca Boehme 3 August 2023
In May 2023, we discovered we’d been included in The Sunday Times’ ‘Best Places to Work in 2023’ list . This phenomenal achievement was the icing on the cake of what’s been a great few years for Mesh as an employer. From achieving our B Corp in November 2021, to being recognised in B Corp’s ‘Best in the World’ category for workers in March 2022, to growing the business to the 22-strong team it is today, it’s been both incredible to see our recognition grow, and a mammoth effort to get here.
by Doug Johnson 27 July 2023
Incorporating low-energy solutions like solar PV, battery systems, and other energy-efficient technologies into commercial buildings offers several key benefits. We cover the top 5 in our latest blog.
by Doug Johnson 20 July 2023
In this second blog on the technology behind low-energy commercial projects, I'll be exploring why solar PV, energy storage, EV charging systems, and LED lighting are crucial assets to any low-energy commercial building.
by Doug Johnson 13 July 2023
It's estimated that commercial buildings contribute around 8% of the UK's total annual carbon emissions, and carbon associated with heating, ventilating, and cooling buildings makes up about 40% of a building's total annual energy usage.
by Lewis Caudy 5 July 2023
When it comes to sustainable and energy-efficient building design, architects are increasingly turning to geothermal technology as a viable option.
More posts

Subsribe to memo from mesh

Share by: