Sustainable design: how does it reduce running costs?
Orientation, insulation, shading, ventilation and daylight: simple design decisions that reduce energy use over the life of the building.
Sustainable design does not necessarily mean expensive materials or complicated technology; it means smart decisions taken early in the design stage, when changing them costs almost nothing. The effect shows in the electricity bill and in occupants’ comfort over the years. Note: the amount saved differs from one building to another depending on the site, use and building materials, so we do not quote percentages or figures here.
1. Orientation, sun and wind study
Placing openings and main rooms according to the sun’s path and the prevailing wind lowers indoor heat in summer and makes use of light and warmth in winter. This decision is taken with the very first plan and costs nothing extra.
2. Thermal and moisture insulation
Insulating roofs and walls exposed to the sun limits heat transfer and reduces reliance on air conditioning. Moisture proofing in the right places protects the building from early deterioration.
3. Shading and suitable glazing
Fins, overhangs, mashrabiya screens and shade trees reduce indoor heat, and choosing the right type of glass for each façade balances daylight and heat.
4. Ventilation and daylight
A design that allows air to flow through the spaces and provides enough daylight reduces the running hours of air conditioning and artificial lighting and improves comfort.
5. Choosing materials and equipment
Durable materials suited to the climate, energy-saving lighting and appliances, and water heaters or renewable energy sources where they suit the project all reduce running and maintenance costs.
In short: ask about sustainability in the very first design meeting; the extra cost at the start is usually small compared with what it saves over the life of the building.
Note: this article is general information for awareness; it is not engineering advice on a specific project and does not replace consulting a qualified engineer. Requirements, procedures and fees differ between authorities and change over time, so confirm what is required with the competent authority.
