APPROVED DOCUMENT L2B – 2010 EDITION

a)

Places of worship

b)

Temporary buildings with a planned time of use , 2 years (but not portable/ modular buildings with a planned service life exceeding this)

c)

Workshops with low energy demand

d)

Stand alone buildings < 50m²

e)

In addition to these exemptions, flexibility/ exemption from these requirements can be made in respect of Listed Buildings, buildings in Conservation Areas and buildings with architectural/ historic merit. Building Control will discuss with Conservation team.

a)

Required if building will contain a greater or fewer number of parts for separate use.

If >100m² and 25% of the existing building, treat as a new building and use L2A (Consequential improvements may still apply though).

Smaller extensions – 3 ways of proving compliance;

a)

Meet min. fabric standards and limit windows etc.

b)

Area weighted u-value calculation

c)

CO² calculation

a)

Controlled services / fittings to meet new standards.

b)

Ensure area of windows not excessive.

c)

All new elements to meet new standards.

d)

Replace windows/ doors if >3.3

e)

Upgrade retained / renovated thermal elements as necessary.

Alternatively, carry out a CO2 emissions calculation to prove compliance.

a)

Windows – meet new standards (1.8), draught proof and provide insulated cavity closers.

b)

If new window opening provided, ensure total does not exceed permitted area or other measures to be adopted.

6 – Controlled Building Services (e.g. Heating/ hot water systems, Lighting)

a)

If extended or provided – follow guidance.

b)

Replacing – ensure no less efficient than before.

c)

Energy meters required

d)

Commissioning certificates required for heating and hot water systems before completion certificate can be issued.

a)

Must be ensured – adopt accredited construction details

a)

Details provided of when elements must be improved when being renovated (50% of element, 25% of total building) or retained.

b)

Practical examples provided in Appendix A

Applies to existing buildings .1000m² where the work consists of;

a)

an extension

b)

initial provision of a fixed building service, or

c)

an increase in the installed capacity of any fixed building service.

If this applies;
Extensions – adopt measures to at least 10% of the value of the works.
Other – improve building fabric (not limited by cost nor counting towards 10%) and then carry out additional improvements to the value of at least 10%.

a)

Operating and maintenance instructions to be given to user – Building Log Book