Converting houses into flats and HMOs requires careful fire safety design. We cover LACORS guidance and common pitfalls.. Residential Conversion Fire Safety Converting existing buildings into multiple residential units introduces fire safety requirements that can be challenging in historic structures. LACORS Guidance The LACORS guide provides fire safety standards for HMOs: Detection categories based on risk level Escape route protection requirements Fire door specifications Emergency lighting requirements Fire separation between units For HMO fire safety consultancy, contact us.