House Extensions · London
Rear extensions, side returns, wrap-arounds and double-storey additions across London — designed with a considered architectural eye and managed from concept through to planning permission and beyond.
Begin a Conversation
What We Design
From a modest kitchen extension in Hackney to a complex rear and basement scheme in Mayfair, Rosace brings the same level of precision, quality, and care to every project. We design extensions that feel like they were always there.
Our work is deliberately restrained — we don't impose an architectural signature onto your home. Instead, we listen carefully to how you live, then design a space that responds to your brief, your site, and your home's existing character.
Our Approach
Most homeowners in London find the extension process opaque and stressful. At Rosace, our role is to make it the opposite: clear, structured, and ultimately enjoyable. We handle the design, the planning application, the building regulations drawings, and the contractor coordination — leaving you free to focus on the result.
We work primarily across Central London, West London, South-West London, and Surrey. Our familiarity with local planning authorities — from Westminster to Kingston — means fewer surprises and better outcomes.
How It Works
01
Consultation
We discuss your brief, your site, and your ambitions. We give you an honest assessment of what is achievable — including planning prospects and likely costs.
02
Design
We develop a design that responds to your home and your brief. We present options, refine the chosen direction, and produce a package ready for planning submission.
03
Planning
We manage the planning application or permitted development notification on your behalf, liaising with the local authority and handling any queries that arise.
04
Build
We produce building regulations drawings and, where required, provide contract administration during construction — keeping the build on track and to design intent.
Common Questions
