Building Regulations - Scotland

Supporting documents are available from the government that provide detailed information on each section of the Building Regulations and Standards. EcoTherm has compiled a summary of the insulation related elements of these documents and provided U-values that will help achieve compliance.

The figures and information quoted are for guidance only. Official Building Regulation / Standard documentation should always be consulted and an approved U-value calculation completed by EcoTherm Technical Services for each project.

New Domestic Buildings (Dwellings) - Technical Handbook Section 6 Energy
The Scottish Technical Handbook for Domestic Buildings looks at the entire building’s performance and CO2 emissions, rather than isolating one particular element. All domestic buildings must be designed and built so their individual Dwelling CO2 Emissions Rate (DER) is no worse than the Target CO2 Emissions Rate (TER).

The TER is generated from a package of measures set for each main heating fuel type; if buildings are constructed following the full package, then it is likely that the DER will meet the TER. As a simplified approach, the dwelling can be considered to reduce CO2 emissions to the same level. CO2 Emission Rates are calculated using a calculation methodology called SAP (Standard Assessment Procedure) 2012.

**On the 1st October 2015, the Section 6 Building Regulations changed. This means that any planning applications submitted after this date will need to comply with these new regulations. Information for regulations from 3rd October 2011, and from 1st October 2015 have been included in the tables below. For further assistance, please call the EcoTherm Technical Services on +44 (0)1702 520166.

The typical Notional Dwelling U-values and target for building elements are shown to in table 1 below.

table 1 - from 3rd October 2011
  Roofs (pitched & flat) Walls Floors
Notional Dwelling area weighted average U-value 0.13 0.19 0.15


table 1a - From 1st October 2015
  Roofs (pitched & flat) Walls Floors
Notional Dwelling area weighted average U-value 0.11 0.17 0.15

Existing Domestic Buildings (Dwellings) - Technical Handbook Section 6 Energy
For existing domestic buildings, the Scottish Technical Handbook provides specific U-values based upon the particular element (walls, floors and roofs) that is being replaced, renovated or for extensions and conversions. There are different requirements for new elements (extensions or conversions) and the Technical Handbook should be referred to for details on these.

U-values shown in table 2 below are the requirements for existing buildings.


table 2 - From 3rd October 2011
    Flat roofs Pitched roofs Walls Floors
For replacement or refurbished roofs New elements (extension/ conversion) For replaced or refurbished roofs New elements (extension/ conversion) Existing walls (refurb) New walls (extensions) New floors (refurb) Existing floors (extension)
Ceiling level Rafter level
Required area weighted average U-value Where U-values for wall and roof of the exisiting dwelling are poorer than 0.7 and 0.25 respectively 0.15 0.15 0.13 0.15 0.15 0.22 0.19 0.18 0.15
Where the above wall and roof U-values do not apply 0.18 0.18 0.15 0.18 0.13 0.22 0.22 0.18 0.18

table 2a - From 1st October 2015
  For replacement or refurbished  flat roofs For replaced or refurbished pitched roofs Existing walls (refurb) Existing floors (refurb)
Ceiling level Rafter level
Required area weighted average U-value Where U-values for wall and roof of the exisiting dwelling are poorer than 0.7 and 0.25 respectively 0.13 0.11 0.13 0.17 0.15
Where the above wall and roof U-values do not apply 0.18 0.15 0.18 0.22 0.18

New Buildings other than Dwellings - Technical Handbook Section 6 Energy
Matching the requirements for new domestic buildings, the Scottish Technical Handbook sets a Target CO2 Emissions Rate (TER) for non-domestic buildings based on Notional Buildings that the individual Buildings CO2 Emissions Rate (BER) must meet. The TER is generated from a set of Notional Buildings; if buildings are constructed within these parameter values their BER should meet the TER. CO2 Emissions Rates are calculated using the Simplified Building Energy Model (SBEM).

The actual specification required for a compliant building and necessary building fabric U-value targets may vary depending on the actual overall proposed specification and the outcome of the energy assessment.

The typical Notional Building U-values and target for building elements are shown in table 3 below.

table 3 - From 3rd October 2011
  Pitched roofs Flat roofs Walls Floors
Notional Dwelling area weighted average U-value 0.16 0.25 0.30 0.25

table 3a - From 1st October 2015
  Roofs Walls Floors
Notional Dwelling area weighted average U-value Heated & natural ventilation 0.18 0.23 0.22
Mechanically ventilated / cooled 0.16 0.20 0.20
Shell and fit only 0.15 0.23 0.20

Although ADL2A is for new buildings other than dwellings, there are some exceptions for mixed use buildings. For more details on these exceptions ADL2A should be referred to.

Special considerations are made for low energy demand buildings, modular/portable buildings, temporary buildings, industrial sites, workshops, and non-residential agricultural buildings. ADL2A should be consulted for further details.

Existing Buildings other than Dwellings - Technical Handbook Section 6 Energy
The Scottish Technical Handbook sets specific U-values based upon the particular building element (wall, floor or roof).

The target U-values for building elements within existing buildings other than dwellings are shown below in table 4.

table 4 - From 3rd October 2011
  Roofs Walls Floors
For replacement or refurbished roofs in previously heated buildings New elements (extension) or previously unheated buildings Existing walls (refurb) in previously heated buildings New walls (extensions) or previously unheated buildings Existing floors (refurb) in previously heated buildings New floors (extension) or previously unheated buildings
Required area weighted average U-value 0.25 0.15 0.30 0.25 0.25 0.20

table 4a - From 1st October 2015
  Roofs Walls Floors
For replacement or refurbished roofs in previously heated buildings New elements (extension) or previously unheated buildings Existing walls (refurb) in previously heated buildings New walls (extensions) or previously unheated buildings Existing floors (refurb) in previously heated buildings New floors (extension) or previously unheated buildings
Required area weighted average U-value 0.25 0.15 0.30 0.25 0.25 0.20

 

If you need any assistance or clarification regarding Building Regulations for your upcoming project, get in touch with our Technical team

Discuss your project with us
We use cookies on our website www.ecotherm.co.uk. To find out more about the cookies we use, or to change your cookie preferences i.e. to remove your consent to our use of certain categories of cookies, please visit our Cookie Policy & Control page.

Please click “Accept and close” to accept the use of cookies on our website. If you do not click “Accept and close” but continue to use this website: you thereby consent to the use of all EcoTherm Insulation cookies and third party cookies for the purposes of improving performance, improving functionality and audience measurement, in accordance with the terms laid out in our Cookie Policy & Control page; and we will assume that you have read and understood our Cookie Policy & Control page.