The Big Six speculative office developments to watch out for in 2026

Cautious investor sentiment, elevated construction costs and high vacancy rates have kept new office construction starts muted across the Big Six regional office markets of Birmingham, Bristol, Edinburgh, Glasgow, Leeds and Manchester. Following several years of declining activity, from over 7 million square feet in 2019, space under construction across the Big Six has reached a long-term low of 1.5 million square feet.