RENOVATING SUSTAINABLY
Going for an update is a big under taking, but what are the extra things to consider if you want to make your home warmer, healthier and as planet-friendly as possible?
Go for the best you can afford, including triple glazing, double and triple-panel radiators, sheep’s wool insulation and air-source heat pumps
1 DO I NEED A SPECIALIST ARCHITECT AND BUILDER?
‘Choosing an architect who works with sustainable building materials and models improvements using thermal energy software will help you make informed decisions,’ says Paul Testa at Hem Architects. ‘While it’s not essential that your builder has experience with sustainable builds, a strong working relationship between the specialisms is key. We always recommend that clients visit previous projects before commissioning a company.’
2 IS IT BEST TO GO FOR ASTAGED RETROFIT OR RENOVATE IN ONE GO?
‘A full sustainable renovation may be cheaper overall, but most of our clients choose a staged retrofit to spread costs,’ explains Paul. ‘We draw up a list of stages with measures you might undertake at each point. If insulation is a top priority, consider improving the thermal performance in the entire house; ideally use natural breathable insulation in the attic, under floorboards and on the inside or outside of external walls (rendering or timber cladding will also be required externally). Careful planning will minimise the risk of moisture damage occurring.’
3 CAN WE KEEP OUR EXISTING RADIATORS IF WE CHANGE TO AN AIR-SOURCE HEAT PUMP?
‘Sometimes, but this type of heating system works on low flow temperatures around 35-45°C (a traditional radiator system warmed using a gas boiler has a flow temperature around 75°C), which means radiators will need a larger surface area to distribute the lower temperature efficiently,’ says Paul. ‘Double and triple-panel options are more suitable than singlepanel radiators. A survey for a heat pump installation will advise if your existing radiators need changing. Also, in older properties, some basic retrofit measures such as cavity wall and loft insulation may be required before upgrading your heating.’ Visit gov.uk
