Navitas EAS Win Two National Awards

26 September 2016

We are thrilled to announce that after being nominated for two of the BUILD Sustainability awards, we have been named this years winner in not one but two categories.

Construction Assessment Specialists of the Year - UK

BUILD Innovation Award for Sustainable Energy Solutions - UK

To see the full article printed in the BUILD magazine please visit

Green Deal

10 June 2015

The Green Deal in its current format is likely to be a victim of the the Governments austerity plans as DECC loses a significant chunk of its £3.3 Billion annual budget according to Amber Rudd- the Climate Change Secretary.

Significantly the Green Deal no longer has a minister directly responsible for the programme with Energy Efficiency now within the remit of Lord Bourne, the most junior minister in the department. This situation is reminiscent of the Home Information Pack debacle and will spell the end for Green Deal Providers and Installers.

There may still be a future for GDAs and GDAOs but this will be dependent on the Government continuing to require a GDAR for RHI applications.

Government launch domestic Renewable Heat Incentive (RHI)

11 April 2014

The Department of Energy & Climate Change (DECC) has today (11 April 2014) announced the launch of the new scheme which offers cash incentives to households using renewable heating systems in their homes. This is the first Government scheme to offer long term financial support for renewable heat, offering homeowners payments to offset the cost of installing low carbon systems in their properties.

The Part L 2013 documents were published on Friday 15th November 2013. The updated Regulations come into force on 6th April 2014 for dwellings that have not previously been subject to a building notice, full plans application or initial notice.

22 November 2013

1. The 2013 document is simpler to read and much easier to understand.

2. There are now two targets to meet. As well as the Target Emission Rate (TER) the dwelling needs to meet a Target Fabric Energy Efficiency (TFEE) measured in kWh/m2/year. The Regulations have been amended to include the TFEE within the mandatory element of L1A (Criterion 1).

3. The TER and TFEE are both based upon the performance of a newly defined Notional Dwelling. This dwelling has a fixed specification for U values, heating etc that provides a 'prescription' for one way of meeting the target. However, the builder has total flexibility in the specification they choose as long as these two targets are met. The specification for the notional dwelling can be found in Section 5 page 25 of the ADL1A document and in more detail within the finalised SAP 2012 document issued on 31st October 2013 (see references at the end).

4. The TER equation is now much simpler. It no longer includes an improvement factor over the previous Building Regulations. The new target of a 6% reduction as compared to Part L 2010 is still achieved through the specification of the notional dwelling. The TER equation still contains a Fuel Factor for heating; the factors are similar to 2010 but adjusted slightly to compensate for higher carbon factors in SAP for electricity, solid fuel and LPG. The TER calculation also requires the lengths and psi values of each thermal bridge; as a consequence the only y value that can be specified when calculating a DER is 0.15 W/m2K. The aim is to encourage builders to consider thermal bridging earlier on in the process.

5. The TFEE is quite simply the FEE for the notional dwelling. This differs to the approach outlined in the consultation process held in early 2012 where separate targets were proposed for various built forms (e.g mid terraced vs end terraces).

6. Both the TER and TFEE values can be achieved using average values, as long as all of the dwellings are within a single block of flats or terrace.

7. The limiting fabric values are unchanged from Part L 2010 e.g. Wall U value 0.3 W/m2K, Air Permeability 10 m3/hr/m2. The limiting system efficiencies are as per an updated Building Services Compliance Guide and do not appear to have changed significantly.

8. There is a new section in the document called 'Demonstrating Compliance' and an associated Appendix. The document makes it much clearer that an EPC does not demonstrate compliance but is an associated output from the process. What demonstrates compliance is documentation provided by the Builder to Building Control showing that the dwelling meets the required targets along with details of how specifically this was achieved. These are needed before work starts (at least 1 day) and after work ends (within 5 days).

9. There is a new Regulation (25a) requiring builders to have documentation demonstrating that they have considered the technical, environmental and economic viability of high efficiency alternative systems i.e. renewables, cogeneration, district heating and cooling, heat pumps etc. The trigger for when features of the dwelling appear on the Key Features List (in outputs from SAP software) have been adjusted to reflect the higher fabric standards that will be promoted by the TFEE.

10. Part L 2013 covers England only. Wales will from later in 2014 have its own building Regulations based upon the same methodology but with different targets. Scottish Building Regulations will follow in 2015.

The Approved Documents for Part L 2013 and the updated Design Compliance Guide can be found at

The finalised SAP 2012 document can be found at