Design Services

Design Services

Systems for you or your Customers.

ThermaQ offer heating & plumbing design services through our partner DHD (Domestic Heating Design Ltd). Providing design packages to the new-build domestic market and all types of properties; from the self-build up to large sites for the major house builders throughout the UK, involving all types of heating systems including solar and heatpumps.

Domestic Heating Design - from ThermaQ

ThermaQ is proud to have worked on a large number of developments throughout the UK with our partner Domestic Heating Design Ltd. With core skills and services in place, they ensure that all our building services designs are energy efficient and incorporate world class design practice. From the outset they work closely with our clients to achieve the lowest carbon footprint with cost effective, integrated and energy efficient building solutions.

DHD work with our clients to get the best out of their buildings, from the initial design and the ongoing life of the building to ensure that it will perform for the end user. They’ll consider ease of installation, maintenance, performance and the energy efficiency of the services.

Our People

Our customers benefit from DHD skilled engineers, who are able to provide practical designs gained from an unrivaled understanding of the construction industry.

DHD design software

DHD use a range of industry approved engineering software. AutoCAD is primarily used for all our 2D and 3D designs. Domestic Heating Design Ltd is a BIM ready consultancy; we are fully committed to the use of Building Information Modelling (BIM) on future projects. Our objective is to minimise where possible any environmental impact arising from our building services designs.

Areas of Expertise


  • Building Information Modelling (BIM)
  • Mechanical and Electrical Design Services.
  • Standard Assessment Procedure (SAP).
  • Sustainable and Low Energy Design

Commitment to sustainable building

DHD have experience of designing to ‘The Code for Sustainable Homes’ standard, BREEAM, the ‘Passivhaus’ standard and all current building regulations.

To support our designs and energy solutions we have an accredited SAP assessor within their team. This allows us to produce designs and SAPs hand in hand within one team.

Whether you want to reduce the energy consumption of a building to comply with building regulations, meet a standard, manage your carbon reduction commitment, reduce your energy bills or reduce your carbon emissions, our partner DHD has the knowledge to guide you, based upon years of experience of low or zero carbon technology.

Standard Assessment Procedure (SAP) Services

Standard Assessment Procedure has been adopted by the UK Government as a methodology for estimating the energy performance of planned domestic buildings.

The calculation takes into account a range of factors that contribute to energy efficiency such as:

  • Materials used for construction of the dwelling
  • Thermal insulation of the building fabric
  • Ventilation characteristics of the dwelling and ventilation equipment
  • Efficiency and control of the heating system
  • Solar gains through openings of the dwelling
  • Fuel used to provide space and water heating, ventilation and lighting and renewable energy technologies.

The calculation determines a number of indicators of energy performance these being, an energy cost rating (the SAP rating), an Environmental Impact rating based on CO2 emissions (the EI rating) and a Dwelling CO2 Emission Rate (DER).

The SAP and Environmental Impact rating are based on the energy costs and annual CO2 emissions associated with space

heating, water heating, ventilation and lighting, less cost savings from energy generation technologies. They are adjusted for floor area therefore independent of dwelling size for a given built form. The ratings are expressed on a scale of 1 to 100, the higher the number the lower the running costs and better the standard.

The Dwelling CO2 Emission Rate is a similar indicator to the Environmental Impact rating, which is used for the purposes of compliance with building regulations. It is equal to the annual CO2 emissions per unit floor area for space heating, water heating, ventilation and lighting, less the emissions saved by energy generation technologies, expressed in kg/m²/year. It is this measurement that compliance for building control is measured against.

The SAP tool is also used to generate Energy Performance Certificates for on-construction domestic buildings.

When is a SAP rating required?

If you are planning to construct any new building that will be used as a residence, obtaining a SAP Rating and a Dwelling Emission Rating is generally required prior to starting the construction phase.

Although relatively straightforward to produce, striking the right balance of improvement is not simple. Whilst the SAP should never be used as a design tool, it is highly recommended dealing with an assessor who will be able to spot easy to remedy problems and offer sensible advice to ensure compliance. DHD have a huge span of experience in challenging, tricky building developments and always take a client – first perspective when approaching compliance.

Getting Started

To arrange a SAP calculation, or for expert advice contact DHD to see how they can help.

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