1930s Highgate home gains minimalist extension from Mulroy Architects 1930s Highgate home gains minimalist extension from Mulroy Architects A brick house extension in Highgate by London-based Mulroy Architects updates a 1930s detached home with a view towards the woods Residential extensions are many architecture studios’ bread and butter, but even within this, fairly familiar, type of commission, projects can range vastly in scope and style. North London based Mulroy Architects are experts in the humble house extension, but still, their latest scheme, the redesign and expansion of a 1930s detached home in Highgate, was a real point of departure – predominantly, because of the commission’s larger scale.