Howgate Close Design Principles….their origins

18th August 2021

“…trapping and storing the sun’s energy”

                                                                                                                                          – Brenda and Robert Vale

 

The nine dwellings of Howgate Close are designed to operate free of fossil-fuels, deliver low to no heating bills while maintaining steady state internal air temperatures.

 Achieving a ‘zero-heated’[i] status, requires the application of passive solar design[ii] techniques allied with a high thermal mass superstructure and a super-insulated envelope. Empirical data[iii] supports the premise that high thermal mass buildings can significantly reduce heating loads together with a concomitant reduction in green-house gas emissions.

The passive solar design techniques applied at Howgate Close are millennia old. Troglodytes selected caves with southerly entrances, Neolithic settlers built dwellings on the southern shores of Skara Brae, Orkney Isles and  Saxon farmers orientated barn openings for threshing and drying. These intuitive building design decisions of orientation and material selection were instrumental in heating, cooling and ventilating ancient buildings.

Modern day champions of passive solar design, are Architects, Professors Brenda and Robert Vale. Their extensive Cambridge University research led to the 1975 publication ’The Autonomous House[iv] which elicits “trapping and storing the sun’s energy”[v]. Putting these techniques in to practice, the Vales converted  their Witcham Toll family home, described in their book, ‘The Self Sufficient House’. Later in 1991, they optimised these techniques in their Southwell home (7miles from Howgate Close) of which a forensic account is given in ‘The New Autonomous House’. The Southwell home builder, Nick Martin, commissioned the Vales to design the Hockerton Housing Project (HHP) which later became the architectural precedent for Howgate Close.

The four basic principles of passive solar design;

• Southerly building orientation – optimizing solar gains for heating, lighting and ventilation
• Selective Glazing locations – maximising glazing on the south elevation for solar gains, reducing glazing to the north, east and west to reduce heat loss
• High thermal mass structure – using dense building materials to act as a large storage radiator, stabilizing internal air temperatures
• Super-insulation envelope – which reduces the rate of heat loss from the buildings while increasing their capacity for retaining stored heat.

Howgate Close delivers.

 

 

[i] DETR. 1998. Building A Sustainable Future. General Information Report 53. P13

[ii] SZOKOLAY, S.V. (2007) Introduction to Architectural Science: The basis of Sustainable Design

[iii] HARRALL, J. (2014) Reservoirs of Heat: The defining characteristic of high thermal mass buildings.

[iv] VALE, Brenda & Robert. (1975) The Autonomous House: design and planning for self-sufficiency

[v] VALE, Brenda & Robert. (1975) The Autonomous House: design and planning for self-sufficiency

Howgate Close: Is this a third way?

4th August 2021

A rhetorical question asked by Professor Ian Rotherham when recently introduced to ‘Howgate Close’ by Dr Chris Parsons.

‘Howgate Close’ offers many solutions, not least attending to recent issues raised by the European Environment Agency.

“Agriculture has high impacts on the environment and the climate…...farmers can play a key role in maintaining and managing Europe’s biodiversity. They are also a critical component of the rural economy….. impacts on the environment and its socio-economic importance for many communities.”

https://www.eea.europa.eu/signals/signals-2015/articles/agriculture-and-climate-change

‘Howgate Close’ attends to some of these issues while offering a replicable model providing;

• generational investment for farms
• local housing for local people
• biodiversity by re-wilding
• community access to woodland pasture meadows

It is accurate to describe Howgate Close’s 10acre development site as having ‘no net biodiversity loss’ instead, a ‘net biodiversity gain’.

Dr Parsons inspiration for the project was in part, tackling local community concerns to changes in their immediate surroundings e.g.

• Living in close proximity to intensive industrialised farming i.e. agrochemicals effects on health and wildlife
• Restricted access to open-countryside with increased intensive land use
• Erosion of biodiversity and wildlife. 
• An absence of wildlife sites close to communities

Under-construction on part of the 10 acre site are nine homes with exceptionally low lifetime embedded carbon, dwellings whose functional lifetime will be measured in centuries rather than decades.

The ‘Howgate Close’ business model facilitates funding in-perpetuity for; property upkeep, maintenance of woodland pasture meadow while securing renewable energy for generations, into the emerging post-hydrocarbon era.

Integral to the model is Dr Parsons self-imposed Section 106 Agreement with the Newark & Sherwood District Council to retain properties in rent for a minimum of 15 years and exclusively for local people. If ever sold, the dwellings can only be sold for 80% of market value in-perpetuity.

Professor Ian Rotherham described Dr Parsons stewardship of Eakring’s landscape, as;

“A vote of faith in the future”

Is then, ‘Howgate Close’ a third way?

Is this a way of creating a ‘wood-pasture meadow’ for every village in England?

Indeed, will other farmers take up the model?