About   |   Contact   |   Home       Costs for a Solar Thermal System. The cost of a Solar Thermal hot water system will depend on whether the tank is to be changed, the size of the system and the amount of installation work. Costs start at approximately £3000. Grants are available for solar thermal panels, for upto £400, and VAT is chargable at 5% if the system is supplied and installed by us. We can supply all the system components, for the capable DIY person. Costs for a PV System.The cost of a PV installation varies depending on what sort of PV system you want. Generally for a roof mounted installation you would be looking at approximately the following costs: 1.5 Kwp system = £8000-£10000 Grants towards the cost of an installation and tax relief incentives for having a solar technology installed are available. For more info on grants go to www.lowcarbonbuildings.org.uk. A system installed can also add up to 10% value on a property. Also announced in last years budget which came into effect on 1st October, 2007, was that all zero carbon homes with the value of up to £500,000 would be exempt from stamp duty, with houses over £500,000 receiving a reduction on there stamp duty of £15,000. This incentive is set to run until 2012.