APPROVED DOCUMENT L1B – 2010 EDITION

a)

Flexibility can be adopted in applying these regulations to Listed Buildings, buildings in Conservation Areas and buildings with architectural/ historic merit. Building Control will discuss with Conservation team.

a)

Meet min. fabric standards e.g. wall (0.28, windows 1.6) and limit windows etc.

b)

Area weighted u-value calculation – see our heat loss calculator.

c)

Whole dwelling calculation using SAP 2009.

In all cases heating and lighting must satisfy minimum requirements and limiting u-values must be complied with to prevent risk of condensation – 0.7 walls and 0.35 roofs.

a)

Not exempt if heating system is extended from dwelling into the conservatory.

b)

If not exempt for any reason, thermal separation required, independent heating controls, all elements to meet min standards, but no limit on glazing.

c)

No mention made of substantially glazed extensions, but considered reasonable to treat as non-exempt conservatory / porch.

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, use SAP 2009 to prove compliance.

In addition, Energy Performance Certificate required if building will contain a greater or fewer number of parts for separate use.

a)

Windows – meet new standards (1.6 or WER band C, doors 1.8), draught proof and provide insulated cavity closers.

b)

If new window opening provided, ensure total does not exceed 25% or other measures to be adopted.

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

a)

If extended or provided – follow guidance in DBSC guide.

b)

Replacing – ensure no less efficient than before.

c)

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

a)

Operating and maintenance instructions to be given to user.

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).

b)

Practical examples provided in Appendix A.

a)

Required when extending or providing fixed building services to very large dwellings (>1000m²).