087 928 0035 info@advancedenergy.ie

BER and Part L 2019 compliance

Pre construction BER service

AE Solutions offer a service that gives a detailed pre-construction package.

The package includes the Part L compliance report and outlines guidelines for achieving an “A” rated new build and sets out the requirements needed to meet NZEB Part L 2019 of the building regulations.

What’s included:

  • Pre-BER
  • Part L 2019 Compliance report
  • DEAP 4.2 – dwelling report (This is then used the heating system installer/supplier to the heating system for the dwelling)
  • U-Value calculations including detailed building elements specification (floors, walls and roof)
  • Air tightness specifications
  • Ventilation specifications
  • Window and Door specification
  • Heating system specification (Air to water heat pumps, system sizing etc)
  • Renewable technology (Solar PV systemsand wood burning stoves etc)

Feel free to get in contact on 087-9280035 to discuss further.

Introduction of NZEB.

Maximum Permitted Energy Performance Coefficient (MPEPC). The MPEPC for a nearly zero energy dwelling is 0.30


Maximum Permitted Carbon Performance Coefficient (MPCPC). The MPCPC for a nearly zero-energy dwelling is 0.35


Renewable Energy Ratio (RER)

This is the ratio of the primary energy from renewable energy technologies to total primary energy as defined and calculated in DEAP

Renewable Energy Ratio (RER) of 20% is required as per ISO EN 52000 (to replace 10kWh/m2 /yr).

Air tightness testing

Reduction of air tightness backstop from 7.00m3 /hr/m2 to 5.00m3 /hr/m2

An airtightness test should be carried out on all dwellings on all development sites including single dwelling developments, to show attainment of backstop value of 5 m3 /hr/m2. The tests should be carried out by a person certified by an independent third party to carry out this work, ie. National Standards Authority of Ireland (NSAI)

Test Standard: I.S. EN 9972:2015 – Thermal Performance of Buildings – Determination of Air Permeability of Domestic Buildings.

The target for any new build should be to achieve an air permeability test result of less than 1.00m3/h/m2 as this is best practice.

Best practice Good Acceptable Fail
q50 result @ 50 Pa 1 m3/hr.m2 or less 1-3 m3/hr.m2 3-5 m3/hr.m2 Over 5m3/hr.m2

Source: The Air Tightness Testing & Measurement Association (ATTMA) TS1

Building Fabric U-Values

New Buildings – Part L 2019 U Values
Building Element Maximum U-Values
Ground Floor (No Underfloor Heating) 0.18W/m²K
Ground Floor (Underfloor Heating) 0.15W/m²K
External Walls 0.18W/m²k
Flat Roof 0.20W/m²K
 (Sloping Ceilings; Rafter Level) 0.16W/m²K
Cold Roof (Ceiling Level) 0.16W/m²K

Part L Major Renovations

Major Renovations to a cost optimal level where technically, economicallyand functionally feasible.

Alterations to a minimum of 25% of your home’s surface area or a New Extension affecting more than 25% of the surface area of the existing dwelling’s envelope are defined as “Major Renovations”.


Ventilation Part F 2019

Guidance on good practice regarding energy efficiency of dwelling ventilation systems is contained in GPG 268 Energy efficient ventilation in dwellings – a guide for specifiers, available from the SEAI.

Where a mechanical ventilation system designed for continuous operation (with or without heat recovery) is installed for the provision of ventilation to a dwelling or significant part thereof, the system should meet the performance levels specified in GPG 268 and also have specific fan power and heat recovery efficiency backstop values where appropriate not worse than those given in Table 4. Performance data for mechanical ventilation systems from system manufacturers for use in DEAP should comply the DEAP methodology.

The effectiveness of mechanical ventilation systems improve as air permeability values decrease. Air permeability values of less than 3 m3 /(hr.m2 ) at 50 Pa are recommended in dwellings with mechanical ventilation, especially ventilation systems with heat recovery