Retrofit of Victorian mid-terrace in Salford

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This was a renovation project of a solid-walled house built around 1900, located in Salford, Greater Manchester. The work included both energy efficiency retrofit measures (e.g. insulation, MVHR) in tandem with other work as part of the renovation.The energy efficiency measures revolved largely around insulation, airtightness and ventilation.
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Retrofit of Victorian mid-terrace in Salford : Project images

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CO2 emissionsPrimary energy requirement
Energy target

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions

Measured data from renewable generation is not yet available.

Fuel use

Electricity use - - 1319 kWh/yr
Natural gas use- - 3060 kWh/yr
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement - - 97 kWh/m².yr
Annual CO₂ emissions - - 20 kg CO₂/m².yr
Annual space heat demand - 84 kWh/m².yr -

Renewable energy

Electricity generationForecastMeasured
Renewables Technology--
Other Renewables Tech--
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
-97 kWh/m².yr
Annual CO₂ emissions
offset by renewable generation
-20 kg CO₂/m².yr

Calculation and targets

Whole house energy calculation method PHPP
Other whole house calculation method-
Energy target
Other energy targets-
Forecast heating load 41 W/m² demand


Pre-development air permeability test02 May 20097.85m³/m².hr @ 50 Pascals
Final air permeability test--

Project description

Start date01 January 2008
Occupation date30 April 2011
Location Salford Manchester  England
Build typeRefurbishment
Building sectorPrivate Residential
Property typeMid Terrace
Construction typeSolid Brick
Other construction type
Party wall construction230mm solid brick
Floor area 70.26
Floor area calculation method Treated Floor Area (PHPP)
Building certification

Project Team

Project lead personEric Fewster
Landlord or ClientEric Fewster
Mechanical & electrical consultant
Energy consultant
Structural engineer
Quantity surveyor

Design strategies

Planned occupancyTwo people working and living in the house.
Space heating strategyHeating to be from mains gas-fired boiler feeding radiators; heat recovered from ventilation exhaust; wood-burning stove to be installed at ground floor level.
Water heating strategyWater heated using mains gas-fired boiler only.
Fuel strategyMains gas, mains electricity (but from 100% renewable supplier).
Renewable energy strategy
Passive Solar strategy
Space cooling strategy
Daylighting strategy
Ventilation strategyMVHR unit to be installed, openable windows for summer.
Airtightness strategy Airtightness to be achieved using attention to detail at all parts of renovation process - gaps filled using expanding foam at all points (e.g. around windows, services entry/exit points, between all solid insulation boards, at top of stud wall that opened into loft, between ceiling plasterboards in loft, at all electric cable entry points in loft etc).
Strategy for minimising thermal bridges
Modelling strategy
Insulation strategyPolyisocyanurate board insulation to be friction-fitted in timber studwork at the following places: Internal walls on external-facing elevations, suspended timber ground floor, and bathroom ceiling. Mineral wool insulation for the loft space.
Other relevant retrofit strategies
Contextual informationThis project was carried out by myself as an individual after having done some reading and research. Some of it was done by builders, other parts I did myself. The expected sequence of work and what was actually implemented in the end did change over time with better understanding of what had to happen before something else, and also some compromises were made on materials due to budget available as the work progressed (e.g. DG PVC windows rather than triple-glazed wood frame windows).

Building services

OccupancyOne person living and working full time in the house, but only at some times of the year - e.g. for 62% of the period quoted for the fuel usage (i.e. 26 October 2010 to 23 November 2011) there was someone in the house.
Space heatingHeating from mains gas-fired boiler feeding radiators; heat recovered from ventilation exhaust; wood-burning stove to be installed at ground floor level (but rarely used).
Hot waterWater heated using mains gas-fired boiler only.
VentilationXpelair Xcell-300 MVHR unit with 91% heat recovery installed, trickle vents and windows openable for summer.
ControlsThree-way controller for MVHR.
CookingElectric oven & microwave, gas hob.
Lighting90% compact fluorescent or LEDs.
AppliancesA-rated fridge, freezer, microwave and washing machine.
Renewable energy generation systemNone.
Strategy for minimising thermal bridgesOn internal wall insulation, floor boards taken up from first floor and polyisocyanurate boards added between joists, also insulation continued into stud wall connection to external-facing wall.

Building construction

Storeys 2
Volume 176
Thermal fabric area 270
Roof description 270mm mineral wool put in loft space, 120mm phenolic foam between batons in bathroom roof.
Roof U-value 0.18 W/m² K
Walls description 70mm phenolic foam between studwork on internal faces of external elevations.
Walls U-value 0.40 W/m² K
Party walls description Solid brick left as it was - only plastering done.
Party walls U-value 1.58 W/m² K
Floor description 100mm phenolic foam between joists in suspended timber ground floor.
Floor U-value 1.14 W/m² K
Glazed doors description Back door to yard is 28mm gap argon-filled double-glazed door.
Glazed doors U-value 2.30 W/m² K installed
Opaque doors description Front door is a composite door.
Opaque doors U-value 1.70 W/m² K uninstalled
Windows description 28mm gap argon-filled double-glazed windows.
Windows U-value 2.20 W/m² K installed
Windows energy transmittance (G-value) 72 %
Windows light transmittance -
Rooflights description One velux window installed in bathroom.
Rooflights light transmittance 56%
Rooflights U-value 1.98 W/m² K

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