Typically, a Velux and  dormer loft conversion on a terraced property will take five to six weeks  to complete and a Gable end and a dormer conversion on a semi-detached property will take six to seven weeks to complete. These timings are an accurate guideline as we have a team of full time tradesmen that convert the loft and they have been with us for more than 10 years.  This means, barring exceptional weather conditions, we are confident of our agreed timescale with the customer