CAD 21 are professional design consultants in the field of Building Services Engnerring encompassing the following specialist areas:Air ConditioningDomestic Water ServicesPowerFire AlarmData and CommunicationsSecurity SystemsEmergency Power GenerationLightning ProtectionMedical Gases and Compressed Air ServicesLow carbon emission and renewable energy systems. LiftsHeatingEnergy SurveysCondition SurveysSBEM calculations and reportsEPC /DEC (energy performance certificates) BREEAM assessments