The Phoenix Project by Chrissie Loveday

Can Rosemary build a new life from the ashes of her past?
After the death of her parents, Rosemary Breedon discovers she was adopted, and decides that she needs a fresh start. A trained architect, she prepares to build herself a new home, with the help of her friend Drew Trevellas.
But someone doesn't want her plans to succeed. After her caravan is destroyed by fire she moves in with Drew. Soon tools and building materials start to disappear. Rosemary is plagued by emails, more thefts and threats, until part of the new house is demolished. Then the farmer next door is murdered and his partner is suspected of the crime.
Who is doing so much damage? Who wants to frighten her away?