There are clearly various financial considerations to take into account when considering the possibility of adding photovoltaic panels to your roof. Recent moves by the Government to half the amount by way of subsidies is certainly one big consideration. However, I have some other matters which I think need at least as much thought during the decision-making process – these are the associated maintenance issues, appearance, a query regarding the green credentials of imported panels and the need for a full assessment of the costs and benefits.
We had a recent loft conversion project for a client who had separately arranged for the provision of a bank of 24 panels to his roof. I was able to witness the number of fixings through the slated roof covering – fortunately, in this case, as part of the loft conversion works, re-slating of the roof was carried out and the roofer provided access to the stripped roof for the PV installers to locate all of their fixings; the roofer then very neatly provided lead shrouds to all of these. The end result was good, with properly fixed slates and properly waterproofed fixings. However, this led me to wonder how different the situation would be on an older tiled or slated roof – where the installers need to remove and later re-fix slates or tiles for four fixings per panel – a very disruptive and undesirable operation for an old roof. And then what happens when a slate or tile slips or breaks ? Access is impossible to carry out a repair without scaffolding the area, removal (and later re-fixing and re-connecting wires) of the appropriate PV panel ! … to replace a single slate on an old roof which has also, of course, already had slates or tiles disturbed from the fitting of the PV panels.
To my mind, as a Surveyor, this is all a matter of concern. When carrying out surveys, particularly of buildings with old roof coverings, which have PV panels, I will certainly raise this as a significant future maintenance concern with associated cost and health and safety implications.
So, onto the second point, which is the appearance of PV panels on old buildings. Whilst many modern buildings probably do look perfectly reasonable with the south-facing roof slope as a shiny reflective panel of glass, in my opinion, the visual damage to some of older buildings and historic townscapes is significant. I am sure that everybody reading this can recall seeing an old brick or stone house with a roof covering of old clay tiles or slates which has been visually significantly damaged by the provision of PV panels on a prominent elevation. I must ask the question as to whether the visual damage (and potential reduction in value to at least some potential purchasers – such as me) is worth the few hundred (at most) pounds a year overall net financial benefit.
This leads me onto my third point of the costs and benefits of PV panels. I query the overall cost benefits of PV panels if the charges for financing the initial cost is taken into account – for example, a £10,000 loan to fund an installation at an interest rate of, say, 6% equates to an annual cost of £600 just to service the debt ! Even taking money from a decent savings account at, say, 3.5% would have an annual cost of £350. I wonder if everybody takes this into account when calculating the financial benefits.
One final thought is that it is my understanding that most PV panels are made in Japan, Germany, China, Taiwan and the USA. One must question a little the green credentials of something like this which is shipped half way around the world before being put onto a roof in this country.
So, although I am really genuinely in favour of renewable and green energy sources, I do have major concerns regarding future maintenance issues when PV panels are fitted to older roofs. In addition, I query the cost benefits plus the green credentials of panels imported from the other side of the world. From the visual effects of some such green energy projects, I side with the various groups who are now beginning to say that enough is enough with regards to the ever increasing wind farms blighting our countryside – in respect of PV panels, is the damage to the appearance of some of our traditional buildings and towns (including within Conservation Areas) worth the benefits to be gained from PV panels whether that is benefits to the individual or to society and the world as a whole ?
If you would like to discuss any associated matters or other building survey or architectural issues, please do not hesitate to contact Philip or Adrian on 01434 607802 or visit our website at www.smithmarstonllp.co.uk

