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TABLE 1: alternative specifications for mechanical services installations
Option Rate
(£/m2 GIFA)		 Plant space/duct
requirement
(m2/apartment)		 Extra/(saving)
costs in model
(£/m2 GIFA)
Hot water heating (excluding distribution)      
Local hot water cylinder with electric immersion heater 5-6 0·50* –
Local instantaneous hot water heater 3-4 –* (2)
Local indirect hot water cylinder fed from central lthw system
with immersion heater		 6-7 0·50* 1
Centralised hot water supply fed from central calorifier 6-7 0·50 1
Space heating      
Local electric heating using storage heaters 15-17 1·50 –
Local electric heating using skirting panels 20-22 1·50 5
Local electric combination boilers and distribution
to lthw radiators		 22-25 1·50 7
Centralised heat source, distribution to lthw radiators 28-32 2·50 9
Kitchen and bathroom extract      
Localised extract direct to building facade 13-15 – –
Centralised extract with ducting and fans at roof level 20-22 0·05 7
Space heating figures given include allowances for water supply, power supply, dedicated controls and metering. Kitchen and bathroom extract figures are based on a typical setup of one kitchen and two bathroom extract units per apartment.
*Plant space for electrical plant included in space heating.