Doing research online is always a good idea. You don’t know, what you don’t know, and the web can be a great place to start.
HOWEVER, be mindful that the information you read is only as reliable as the person who wrote it. Unfortunately, the web can be full of misleading information, which can give customers unrealistic expectations. This in turn leads to frustrating & fruitless negotiations, disappointment and ultimately turning your project into a non-starter.
Although you will find many online calculators, the cost of a conversion is about much more than just the size of your house, conversion type or preferred design.
In fact, the TRUTH IS….. the cost is very much based on YOU & your personal preferences.
For example, how much is a watch? You could expect to pay anything from a mere £5 on a market stall to an eye watering, designer £50,000K plus. If budget allowed, how would you prefer to fly – Economy or First Class? These important personal preferences are ultimately what will drive the cost of your project.