RaMPHaus (Rooftop and Modular Passivhaus)

Client name:
Energiesprong UK

Cost Consultancy and Principal Designer

RaMPHaus is a deep retrofit of an existing 4-storey block with a rooftop extension and adjacent new build to Net Zero Carbon. Whilst there are several other similar deep retrofit schemes across the UK, RaMPHaus is unique in that it provides new Zero Carbon Homes whilst upgrading the existing homes to the same standard and integrating both new and existing in a single high-quality design. “Energiesprong” is widely recognised as a solution for the funding and delivery of deep retrofit at the scale.

Keegans were appointed to join the multi-disciplinary service team led by ECD Architects, to provide a Viability Assessment and Principal Designer services, up to RIBA Stage 2. Working alongside our consortium partners United Living, BeattiePassive and other consultants, this extended to both the building works and ongoing monitoring to ensure that the building, as handed over and measured in-use, meets the stringent performance criteria of Energiesprong. We added further value to the project through our BIM consultancy team who enabled the project to be designed to BIM Level 2.

RaMPHaus means Rooftop and Modular Passivhaus. Set to achieve the Passivhaus EnerPHit standard, the design of RaMPhaus results in a reduction in space heating demand of approximately 80% which, coupled with new renewable energy systems providing both electricity via PV panels on the roof and heating via Ground Source Heat Pumps (GSHP), ensures its Zero Carbon balance. The improved airtightness enables the use of MVHR (mechanical ventilation with heat recovery) which is co-located with the GSHP offers improved air quality and reduced heat losses. The architectural quality and aesthetic appearance of the existing 1960s block is hugely improved with a non-combustible over-cladding system.

Creatively developing the scheme designs, we worked with the client and contractor to expand upon the requirement for a rooftop development of approximately 3 homes and showed how the building could also be provided with an adjacent extension offering a further 5 new homes. This not only increased the development’s housing supply and cross subsidised the provision of a new lift but also improved the phasing of the project thus reducing the impact upon existing residents.

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