Introduction to Building Physics

Building Physics typically involves the use of computer simulation to better understand the demands upon a building in deciding the most energy-efficient approach to servicing. In the context of Building Physics, ‘Compliance’ usually refers to Approved Document Part L, SBEM, SAP and EPCs.

Knowing the inner workings of the National Calculation Methodology (NCM) together with the respective Notional, Reference and Actual Building can help set you on the path to effective compliance at minimal cost.

Modelling is a complex and iterative process involving a vast array of data to accurately predict the energy demand and operational performance of a building.

It is imperative to maximise the quality of the input data to achieve the most meaningful ang useful outputs. As an iterative process, decisions at each step have consequences; the impact of making a slight wrong turn at the early stages can have a magnifying determent at the outcome. Wouldn’t it be great if you could come to the middle of the ‘compliance maze’ knowing you had the optimum solution of the lowest carbon at the lowest cost? ZED can use the most appropriate tool to get there, whether that be SBEM or DSM and can make informed & evidenced interpretations to feed back to Building Control. This way maximises chances of a smooth road at planning & handover.

Part L Compliance & EPC

ZED has many years’ experience in delivering low carbon buildings, applying innovative methods to meet national, regional and local performance targets, maximising BREEAM credits and achieving low EPC ratings.

We are also highly experienced in residential development, completing SAP calculations for housebuilders and developers since the inception of the assessment methodology. From high-volume, high-rise developments to one-off mansion houses, all must comply with the same legislation and contribute towards our low carbon future. Combined with our design and product knowledge, we can help you find the most effective, practical and economic solution to meet these regulatory demands.

Building Regulations compliance is not limited to energy prediction and conservation – something of equal importance is the means and effectiveness of ventilation. Dynamic calculations can be provided to demonstrate compliance with Part F – Means of Ventilation – this is closely tied to overheating analysis for TM52 and TM59 compliance in commercial and domestic settings respectively.


The importance of visual comfort to building occupants cannot be underestimated.

A visually stimulating environment paired with a balanced and well daylit space has proven benefits for occupant health and productivity, increasing cognitive function and providing a general feeling of wellbeing.

Our analysis informs architectural design of spaces so that resultant energy and overheating performance are balanced against a backdrop of natural light.

Thermal Comfort

At school, home or in the workplace, our thermal environment is crucial to the success of the spaces we inhabit.

Using dynamic thermal modelling to evaluate space performance, whether in pre-construction or existing buildings can inform the design measures necessary to achieve and maintain satisfaction.

Our analysis can determine the optimum size, quantity and location of opening vents and predict how these can be used by occupants throughout the year to maintain excellent indoor air quality for all environments.

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