Generally speaking a tiled roof is the best option for a period property and with good reason, Clay tiles look a lot better and typically last 50 years plus. However, they are significantly more expensive than their concrete counterparts which also shorten the lifespan and detract from the appearance of the roof. Slate roofs are the longest lasting and are generally found on the higher end of the market. The national average for a complete re-tiling of a semi-detached property is between 5,000 and 30,000 pounds.
Generally, flat roofs can be found on garages, extensions and lower end housing from the post war years. Flat roofs have a bad reputation from the old felt roofs of that time, however, recent innovations in roofing like fibreglass and single ply membranes have improved the market. Flat roofs are less expensive than pitched roofs, however, they generally do not last as long.
Fibreglass (GRP) roofs are very popular for flat roofs and roofs on conservatories and garden rooms. They are fully waterproof and have seams, like a portable shower tray, to allow water to drain off. They will last a long time with very little maintenance. They cost more than a cheap, everyday roofing felt but less than a tiled roof.
The biggest determiners of cost for a new roof are size and the condition of what is under the roof, particularly the roof structure. The cost of a new roof can easily be underestimated, for example if scaffolding has to be erected around the entire house. The condition of the roof structure can impact the cost of a new roof. If the roof structure needs to be replaced as well, the cost of the roof structure and the new roof need to be considered together.
Get at least two quotes because the quotes may vary widely due to what is included. Ask what is included because the quotes may not include the same things. Scaffolding and disposal may be included in some quotes, but not in others.
A new roof can change the look of a house and, if done nicely, improve a house. However, a new roof can also be a significant financial cost and, if done on a house with an old roof structure that hasn’t been checked, the cost can be wasted if the old, neglected roof structure isn’t also replaced.