Flat 5, 23 Blakebrook

What the assessor found

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

• Walls

  Solid brick, as built, no insulation (assumed)

  Poor

• Roof

  Pitched, 50 mm loft insulation

  Poor

• Floor

  (another dwelling below)

  Not rated on the certificate

• Windows

  Some double glazing

  Very poor

• Heating

  Boiler and radiators, mains gas

  Good

• Heating controls

  Programmer, TRVs and bypass

  Average

• Hot water

  From main system, no cylinder thermostat

  Poor

• Lighting

  Low energy lighting in 25% of fixed outlets

  Average

• Second heating

  Room heaters, mains gas

  Not rated on the certificate

The assessor's estimates at the energy prices in use when the certificate was made (2016), 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 £134 a year

   Rating after45E
2. 2

   50 mm internal or external wall insulation

   Typical cost £4,000–£14,000 · saves about £473 a year

   Rating after62D
3. 3

   Add additional 80 mm jacket to hot water cylinder

   Typical cost £15–£30 · saves about £16 a year

   Rating after63D
4. 4

   Draught proof single-glazed windows

   Typical cost £80–£120 · saves about £10 a year

   Rating after64D
5. 5

   Low energy lighting for all fixed outlets

   Typical cost £45 · saves about £36 a year

   Rating after65D
6. 6

   Replace boiler with new condensing boiler

   Typical cost £2,200–£3,000 · saves about £235 a year

   Rating after74C
7. 7

   Replace single glazed windows with low-E double glazed windows

   Typical cost £3,300–£6,500 · saves about £62 a year

   Rating after76C

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