Gravesend homes — DA11 and DA12 Thames-side terraces, properly insulated.

Northfleet and central Gravesend terraces are typically pre-1920 solid-brick, with no cavity to fill. The right fix is solid wall insulation — external (EWI) or internal (IWI). EWI is usually the bigger thermal gain: around 90mm of insulation plus render bonded to the outside of the wall, which lifts EPCs two bands and typically saves £400-£800 a year. It does change the external appearance, so in Gravesham's conservation areas we handle the planning application and spec render finishes that suit the local vernacular. IWI is the right call for listed or conservation frontages where the exterior can't change — slim breathable build-ups work without damaging the historic fabric. ECO4 funds the full job for eligible households.

Usually yes, and off-gas Downs-edge villages are where heat pumps pay back fastest. Shorne, Higham and parts of Meopham have many properties still on oil or LPG, often with older 80% efficient boilers. A modern air-source heat pump runs at 300-400% efficiency and typically cuts annual heating costs by £600-£1,200 on a 3-4 bed rural Kent home. The Boiler Upgrade Scheme pays £7,500 off the install regardless of income, bringing typical installed costs to £4,000-£7,000. For older fabric we do a proper MCS heat loss calculation at the survey and uprate radiators where needed — this is where cheap heat pump installs go wrong. Installation is 2-3 days on site after BUS approval.

Carefully and on the front foot. Gravesham has several conservation areas — central Gravesend, Milton Chantry, bits of Northfleet — plus scattered Grade II listed Georgian and Victorian properties. For conservation-area homes we can often get EWI approved using render and detailing that match the local vernacular; we submit the planning application on your behalf and coordinate with the council's conservation officer. For listed buildings, Listed Building Consent is required — more involved, but frequently granted for sensitively-detailed schemes. Where external changes aren't permitted, internal wall insulation (IWI) with breathable build-ups is an effective alternative and still fully funded under ECO4 for eligible households. Loft and under-floor insulation are almost always permitted.

Depends on the starting point. A Northfleet Victorian terrace with full EWI typically saves £400-£800 a year and lifts the EPC two bands. A Riverview Park 1960s semi with cavity wall insulation and a loft top-up saves around £300-£500 a year. An off-gas Shorne or Higham home switching from oil to an air-source heat pump saves £600-£1,200 a year on heating. Adding solar plus a 5 kWh battery layers on another £400-£700 a year regardless of insulation. Your surveyor models the specific numbers for your DA11 or DA12 property at the free survey, so you see exactly what the full package saves — and how much of it is covered by grants and funding — before you commit to anything.