Linden Homes

Greyfriars | AES Sustainability Consultants

Project Description

Client: Linden Homes
Project: Greyfriars Quarter
Location: Gloucester
Units: 246
Type: Mixed

Project Summary
The Greyfriars Quarter is a mixed-use site in the heart of Gloucester and includes the Gloscat Campus and Media Site. The aim of the development was to create an attractive city centre residential neighbourhood providing 246 new homes and apartments in a mix of styles alongside commercial shops and community services.

The Challenge

On this development, the requirement was to adhere to the Code for Sustainable Homes Level 3 and BREEAM Excellent as well as achieving an overall 10% reduction in carbon emissions across the entire site.  Combining the standards of the Code for Sustainable Homes and BREEAM added a challenge as commercial standards are not normally applied to residential and vice-versa.

The challenge was to meet the conditions using light weight steel frame (Metsec) and traditional masonry around a part steel frame with concrete plank floors, and electric heating. By liaising closely with everyone in the design team, we were able to produce a value engineered solution that focused on  improving the fabric efficiency of the steel frame through good linear thermal bridging details. The solution reduced the amount of PV required to achieve the site-wide target, while also maximising the credits available for the Code for Sustainable Homes and BREEAM assessments.

Linden Layouts

Galliford Try, Linden Homes Layouts

Linden Layouts

Project Description

Client: Linden Homes
Location: Nationwide
Units: NA
Type: Domestic

Project Summary

Galliford Try – a FTSE 250 housebuilding and construction group – wanted to develop a national specification for its Linden Homes Layouts to achieve 2013 Building Regulations compliance whilst being easily adapted in order to meet any additional planning requirements cost effectively without compromise to the buildings layout . AES Sustainability Consultants have helped to develop the specification and apply it to a new range of national house-types for building control approval and costing.

The Challenge

The challenge was to create a ‘fabric first’ solution to allow a uniform specification to be used across all future sites, regardless of the planning conditions or site conditions. For example, the window specification was relaxed to allow for the potential use of timber sash windows, and renewable technologies were not selected due to potential planning constraints.

Galliford Try also consulted AES during the production of the standard architectural details to ensure heat loss through linear thermal bridges was minimised. AES then completed Psi-value calculations for the junctions where any improvement in SAP could be gained against industry calculated and Accredited Construction details. The results of these calculations are to be used for all 2013 Building Regulations sites going forwards and provide a significant SAP benefit over Accredited Construction Details and default values.

Galliford Try will also benefit from a wide variety of potential uplifts should particular sites have energy or CO₂ reduction requirements, which has been achieved by avoiding ‘bolt-on’ or renewable technologies for the base specification.

In addition, AES has designed future provision for additional technologies such as Waste Water Heat Recovery into the Linden Layouts at an early stage, minimising the need for changes to working drawings and heating designs, and ensuring construction costs can be forecast accurately.

AES also provided alternative specification options though further SAP modelling to achieve a DER/TER reduction of 19% in line with Code for Sustainable Homes Level 4 requirements.  The general construction and cavity width was maintained, and improved window specification, small PV systems and flue gas or waste water heat recovery systems were also all used where required to achieve the 19% target.