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Home » SBEM Calculations
SBEM CALCULATIONS
WHAT IS SBEM?
SBEM is a tool for demonstrating the energy efficiency of non-domestic
buildings, both new and old.
SBEM is the abbreviation for ‘Simplified Building Energy Model.’ It’s a
government-approved method for calculating the amount of energy needed to heat,
cool, ventilate, and light a non-dwelling structure.
Based on a 12-month period of ‘normal’ use, it provides a realistic
representation of the building’s energy and carbon dioxide emissions, as well as
its energy efficiency (or lack thereof). Offices, warehouses, retail units,
restaurants, leisure centres, and retirement homes are examples of non-domestic
structures.
Get Started
SBEM REPORTS
* Ensure that the Building Emission Rate (BER) isn’t greater than the Target
Emission Rate (TER).
* Assess the fabric of the building.
* Assess for energy efficiency, all ventilation, heating, cooling, water
heating, and permanent lighting systems.
* Set down control measures designed to reduce solar gains in summer, thereby
reducing the need to install air conditioning.
* Ensure that steps have been taken to allow the building to function energy
efficiently.
There are two formats for SBEM calculations: one covers new builds (L2A); the
other deals with conversion and extension work (L2B). The most important purpose
of SBEM figures is to create a BRUKL (Building Regulations Part L) report which
generates a brand-new EPC, or one that has recently been updated.
WHAT DO SBEM CALCULATIONS DO FOR ME?
SBEM calculations are mandatory under Part L (England & Wales), Section 6
(Scotland), and Part F1 (Northern Ireland) of Building Regulations. These are
all documents relating to power and fuel conservation. SBEM calculations were
introduced with the 2006 UK Building Regulations.
SBEM calculations are a prerequisite for any new or updated Energy Performance
Certificate (EPC) and give a property rating ranging from one to one hundred —
the higher the number, the higher the efficiency. It is illegal to sell or rent
out a commercial building that has no EPC.
Enquire Now SBEM Assessments
Enquire Now SBEM Assessments
WHAT INFORMATION GOES INTO AN SBEM?
For us to produce an SBEM report, our customer needs to provide the following
information. The list is not exhaustive but it’ll give you a fair idea of what
we need:
* Floor plans
* Elevations
* Sections
* Site Plans
* Insulation type and thickness
* U-values for all openings
* Heating system specifications
* Details of the method used to produce hot water
* Lighting specifications (including lighting controls)
* Cooling and ventilation specifications
* Details of any renewable technologies
* Accredited building details
It’s important not to over-simplify SBEM calculations, however. Final figures
are dependent on the nature of the construction: new build, conversion, or
extension. In all cases, two reports are generated — new builds require design
stage and as built reports. Conversions and extensions are governed by L2B SBEM
Calculations and give rise to a notional and a proposed report.
L2A SBEM NEW-BUILD CALCULATIONS
Design Stage
We:
* Scrutinise and pass the property’s construction details before construction
starts;
* Use specialist SBEM software to generate a TER rate and show BER compliance;
then
* Create an assessment of predicted energy use.
As Built Report
* On completion of the project, details of the construction are assessed afresh
and final calculations are added, e.g., the designated type of boiler model.
* The EPC derives from this report.
THE CALCULATION OF L2B SBEM (EXTENSIONS AND CONVERSIONS)
Notional Report
We:
* Carry out an assessment of the construction of the whole property, in
addition to the proposed extension or conversion.
* Create a benchmarked data report.
* Use specialist SBEM software to generate a TER rate and to prove that the
building is compliant with BER regulations.
Proposed Report
We:
* Use benchmark data for existing components. Actual performance data are used
for new or upgraded components.
* Use specialist SBEM software to generate a TER rate and to prove that the
building is compliant with BER regulations.
* Pass the property only when its performance values are lower than benchmarked
standards.
* Also check that overall BER measurements are lower in the proposed report
than in the notional report.
* We will replace the existing EPC with a new EPC, where SBEM calculations
demonstrate that all building performance values are lower in the proposed
report than in the notional report.
SCHEDULING SBEM CALCULATIONS
Two SBEM assessments are required: one at the beginning of the building project,
and another at the end. We can produce an SBEM calculation at Design and
As-Built Stages.
Design Stage SBEM Calculations
Design Stage SBEM Calculations must be produced before building work starts, so
you should submit an SBEM report and Building Control/ Warrant Application to a
Building Control Body or Verifier (Scotland) without delay or building work
cannot start.
As-Built Stage SBEM Calculation
On completion, As-Built SBEM Calculations are needed to ensure that the finished
building remains compliant.
WHAT EXACTLY DOES AN SBEM CALCULATION OFFER?
Commercial SBEM calculations indicate the carbon footprint of the surveyed
building as required under Building Regulations Part L. These calculations
demonstrate energy costs and carbon emissions resulting from the proposed
design.
Changes are often made as the project progresses, in consultation with
architects, developers, or customers, to make sure that the building is always
in full compliance with current regulations. We recommend that you engage an
official accredited consultant before committing to your final design.
DO I ALSO NEED AN EPC?
The short answer is yes. Post-construction — once all works have been completed
according to SBEM specifications — an Energy Performance Certificate (EPC) is
created using SBEM figures. If you have engaged us to carry your SBEM
calculations, we will supply your EPC free of charge.
You can rely on us for exceptional service:
* We can carry out SBEM calculations for projects of any size.
* We will review all specifications and plans.
* We will offer recommendations, and make sure we meet your deadlines.
* We will supply your Energy Performance Certificates (EPCs) free of charge.
* Our staff are all accredited experts, highly experienced in their field.
* We can offer cost-effective neutral advice on how to increase the energy
efficiency of your property.
* We take pride in having a fully trained team of professionals, dedicated to
helping you meet your deadlines. We will keep you up to speed throughout the
process. If it suits you, we are always willing to engage directly with your
Building Control Office or Design Team.
* Our assessors are CIBSE qualified to Level 5. This means we are qualified to
carry out SBEM calculations on the most complex projects — those which
incorporate, for example, atriums and complicated ventilation systems.
DYNAMIC SIMULATION MODELLING
DSM software is designed to calculate data for new build commercial properties.
It is also highly accurate and takes account of other external factors capable
of impacting on energy consumption.
DSM software comes into play with large scale complex constructions such as
airports, shopping centres, or sky-scrapers. But the software can prove very
useful for those customers who want a more detailed analysis for their intended
non-domestic project.
In commercial buildings we use Dynamic Simulation Modelling (DSM) to provide a
much more detailed and accurate assessment using a 3D model of your building.
This model enables us to analyse:
* Thermal Performance / Construction
* Renewables and Technologies
* Energy usage
* CO2 Emissions
* Overheating
* Daylight / Sunlight Assessment
* Ventilation / Airflow
* Occupant Comfort
* BREEAM / LEED Performance
Briary Energy typically use DSM for large developments such as hotels and office
blocks.
Rendered DSM using DesignBuilder Software
FREQUENTLY ASKED QUESTIONS
What does SBEM stand for?
SBEM is the acronym for 'Simplified Building Energy Model'. The methodology that
has been approved by government calculates the energy that’s needed to light,
ventilate, heat, or cool a building not used as a dwelling. SBEM calcs
demonstrate the energy performance of both new and existing commercial (i.e.,
non-residential) buildings.
What is an SBEM assessment?
A Simplified Building Energy Model (SBEM) assessment is a government-approved
methodology used throughout the UK in order to calculate how energy-efficient
commercial properties are. An SBEM report takes into account the size, geometry,
orientation, construction, and systems of a building to calculate the amount of
energy it uses monthly and its carbon emissions.
What is the purpose of SBEM?
The Building Research Establishment (BRE) has developed SBEM as a software tool
to analyse and calculate non-domestic building energy performance. SBEM is
intended for use in commercial, non-domestic buildings and supports the National
Calculation Methodology (NCM), the Energy Performance of Buildings Directive
(EPBD), and the Green Deal.
What is a BRUKL output document?
BRUKL output documents are those that calculate a non-domestic building energy
rating. The term BRUKL stands for Building Regulations UK, Part L and is often
used interchangeably with ‘SBEM (Simplified Building Energy Model) report’. The
SBEM is the most common methodology used to produce a BRUKL output document.
What is a BRUKL report?
A Building Regulation UK Part L (BRUKL) report lays out the energy usage and
fuel conservation methods used in a non-domestic building. The document reports
on the likely emissions of a building and is used throughout the building
process to monitor the extent to which the property complies with the relevant
regulations.
What is a Dynamic Simulation Modelling?
Dynamic Simulation Modelling (DSM) refers to a software package that has been
designed to predict the energy performance of larger and/ or more complex
commercial buildings which are required by the relevant regulations to hold
Level 5 EPCs. A few examples of buildings that need Level 5 EPCs are shopping
centres, skyscrapers, and airport terminals.
What is an EPC assessment?
An EPC assessment is the process carried out to produce an Energy Performance
Certificate (EPC) on a building. The EPC assessment calculates how
energy-efficient a property is and how much it will cost to heat and light it on
a scale of 1-100. Properties are graded into bands A to G, where A is most
efficient, G is least.
Do I need an EPC for SBEM?
An Energy Performance Certificate (EPC) is drawn up after an SBEM assessment has
taken place. The EPC states the energy-efficiency rating of a property and is a
legal requirement for any sale or rental of a non-dwelling. Building Control
will also require an EPC before they will sign off on a property.
Can you fail an EPC?
There is no pass or fail with an EPC, but the document informs potential buyers
and tenants of the energy efficiency of a property. A very poor score may
adversely affect your chances of selling or leasing out your building. Your EPC
grading is based on data drawn from a commercial building energy assessment such
as an SBEM.
How long is an EPC valid?
An EPC is valid for a period of ten years and within this period, can be
utilised any time a property is sold or leased out. After the ten-year period is
up, a new commercial building energy calculation must be carried out and an EPC
produced if the building is to be marketed for sale or rented out thereafter.
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