21 Mayfair Close

What the assessor found

Each part of the home, with the certificate's own energy efficiency rating.

• Walls

  Cavity wall, as built, no insulation (assumed)

  Poor

• Roof

  Pitched, 50 mm loft insulation

  Poor

• Floor

  Solid, no insulation (assumed)

  Not rated on the certificate

• Heating

  Boiler and radiators, mains gas

  Good

• Heating controls

  Programmer, no room thermostat

  Very poor

• Hot water

  From main system

  Good

• Lighting

  Low energy lighting in 59% of fixed outlets

  Good

• Second heating

  Room heaters, electric

  Not rated on the certificate

The assessor's estimates at the energy prices in use when the certificate was made (2013), for a typical household. Today's bills will differ.

Improvements the certificate recommends

In the certificate's order. Each rating assumes the steps before it are done.

1. 1

   Increase loft insulation to 270 mm

   Typical cost £100–£350 · saves about £59 a year

   Rating after63D
2. 2

   Cavity wall insulation

   Typical cost £500–£1,500 · saves about £120 a year

   Rating after69C
3. 3

   Floor insulation

   Typical cost £800–£1,200 · saves about £40 a year

   Rating after71C
4. 4

   Low energy lighting for all fixed outlets

   Typical cost £35 · saves about £15 a year

   Rating after72C
5. 5

   Upgrade heating controls

   Typical cost £350–£450 · saves about £59 a year

   Rating after74C
6. 6

   Replace boiler with new condensing boiler

   Typical cost £2,200–£3,000 · saves about £43 a year

   Rating after76C
7. 7

   Solar water heating

   Typical cost £4,000–£6,000 · saves about £26 a year

   Rating after78C
8. 8

   Solar photovoltaic panels, 2.5 kWp

   Typical cost £9,000–£14,000 · saves about £233 a year

   Rating after88B

Costs and savings are the certificate's own, as estimated when it was made.