Our HMO architects turn residential properties into efficient, compliant, and desirable shared homes.
Our experienced HMO architects and technicians can take care of the your HMO development journey from start to finish. Landlords and investors are now converting their properties into houses of multiple occupation (HMOs) to maximise their return on investment, boost the value of their properties and rental incomes. As HMO architects we specialise in HMO conversions for students and young professional. We have a track record of producing many successful projects for holiday lets, B&B accommodation, high-end HMO and large sui generis HMO.
We deal with all HMO planning permissions and building regulations application as well as contractor selection and also site visits during construction if required. We’ll assess how you can achieve the maximum number of HMO rooms, increase room sizes and provide high standards of multi-let accommodation with en-suite facilities
HMO conversion planning rules can be complicated and contradictory. New HMO regulations are launched daily stipulating new sets of requirements but we have the skills and expertise to guide you throughout. Our designs incorporate the best use of space to provide you with the maximum number of brand-new HMOs for individual rentals. Our planning and design concept will ensure that each room feels spacious, bright and appealing to future tenants.
So whether you’d like to convert your family home into a premium HMO for students or young professionals or plan to build large, high-end sui generis HMOs, we’ll help you generate significant ROI. Our proven approach to HMO conversions will help you avoid complications and monitor your building costs. Working collaboratively with your team of contractors, we’ll plan, develop and build your HMO with minimal stress to complete your project on time and on budget.
We’re straight-talking, approachable people who will listen first and guide you on your design and build journey.
Explore some of our amazing bespoke architectural designs.
Heritage
This East London project involved the conversion of a derelict listed mews house into an amazing three-storey property.
The works required construction of a new second floor, new windows and doors, extensive façade works, new chimneys and a full renovation throughout.
Residential
A contemporary extension and loft conversion elevate this terraced home.
The design draws on a range of materials, featuring a balanced mixture of metal, timber and concrete textured finishes.
The biggest issue with 2d plans and 3d images is that our clients struggle to understand the designs concept and when you are paying thousands of pounds on a building project this is not good enough. We use virtual reality as part of the design process to show you options and allow you to walk around the proposals as if you would in real life. You get a sense of how the completed building will feel and the sense of space.
Posted on O AshTrustindex verifies that the original source of the review is Google. CBBA are excellent. I highly recommend. A friend recommended CBBA, after using them. So I included them in the list of 5 architects to check out. CBBA were the only architect firm that gave me a quote that I could understand - clear, simple, concise and relevant. And they also had the best price. But what I liked the most about CBBA was their helpfulness and patience. It was clear that they really cared. Which came through in the design, as well as support through planning process. I really appreciated that. My only feedback is that I hope they can find a software tool that will help with clients like me that ask a lot(!) of questions LOL!. Eg an editable document where questions and comments can be logged and tracked. Mainly so that CBBA aren’t inundated with emails. Thanks again for everything Grant and Oliver!!Posted on Jason YuTrustindex verifies that the original source of the review is Google. It’s been a pleasure working with both Grant and Oliver on several projects, including a residential HMO conversion on Newmarket Road and a commercial conversion on Mill Road, Cambridge. They’ve been consistently responsive, knowledgeable, and client-focused, always considering return on investment. Being local to Cambridge has also been a real asset when dealing with planning matters. I wouldn’t hesitate to recommend them.Posted on Tuhin ChaturvediTrustindex verifies that the original source of the review is Google. We've had a great experience with CBB Architects from the get-go. They provided us with great ideas and design in line with our expectations for our loft conversion project, which due to the nature of the property includes remodelling of the first floor space akin to a single storey extension on the first floor. In addition they did the design of a garden room (single storey ext to our dining space on the ground floor). Although I first found them via Google search, I am impressed and satisfied by the work Grant & his team have done for us. I would recommend them to anyone for the following reasons: 1. Prompt, clear comms, fair and transparent pricing structure, knowledgeable & experts in the services they provide. Also, they are not pushy with sales, i.e. they have different packages at different price points, but they don't push the more expensive options to the clients, something that helps build trust. 2. We wanted a modern design. A quick look at their portfolio suggested that they could be the right architecture consultancy for us. This belief quickly got validated after the first meeting with Grant, who diligently did all measurements and sketched ideas there itself, quite impressive! 3. The final product (in terms of the design) looks very good. CBB did the initial Compliance level drawings for Planning. Then we also used their services for compliance level Building Regs drawings and Structural Calcs. 4. We are about to begin construction work next week; the builder has provided good feedback about the drawings/documents as it enabled him to provide a robust quote. I hope that this comprehensive review allows people to have confidence in reaching out to Grant and CBB for any architecture design and consultancy work, you wouldn't be disappointed. Good luck!Posted on Hollie TopliffeTrustindex verifies that the original source of the review is Google. We used Cameron Bosque Brookes to help us with our extension and can safely say we were very happy with all the work we received from Oliver. He was very knowledgeable and helpful throughout and answered all of our questions, which, as novices to this process, were numerous. Highly recommendPosted on Fraser HawkesTrustindex verifies that the original source of the review is Google. Grant did a fantastic job with our design and planning permission. He really listened to us and has come up with a design that really works and also fits within the budget we had. Would definitely recommend.Posted on Prmanagement Charlie-KayeTrustindex verifies that the original source of the review is Google. We worked closely with Oliver on a double extension. From start to finish he was incredibly knowledgable, helpful and understanding when our vision changed at times helping to create a unique design. He was available whenever needed which left us feeling very supported through the process . Thank you Oliver, you have helped to make our house into our dream home! Well.. once complete!Posted on Fiona MutterTrustindex verifies that the original source of the review is Google. Great experience with Grant and the Team at CBB Architects!Posted on Peter BhagatTrustindex verifies that the original source of the review is Google. Very pleased with the service from CBB. They were extremely helpful and knowledgeable. We were asking for planning permission for some outbuildings in a village near Huntingdon. The local authority needed some extra paperwork and surveys, but the architect at CBB managed them very well and smoothed the path through. (Sounds robotic but I am a real person!).Posted on robert stringerTrustindex verifies that the original source of the review is Google. Clear and timely communications /advice. We ended completely changing our project after Grant gave his viewpoint on our plan (Thankfully) A clear mastery of the Forces needed to negotiate the challenges of entering the planning Portal.Posted on Daniel BrandTrustindex verifies that the original source of the review is Google. I highly recommend Cameron Brookes Architects. Friendly and professional service. My planning permission was secured within six weeks !
We aim to create HMO buildings which offer high quality space for our client’s tenants. HMO is not what it used to be and now there is an expectation for good facilities and sociable areas. We respond to market trends and the requirements of our clients.
Find answers to common questions about our architectural services and how we can assist you.
This depends on the size of the HMO and whether your area has an Article 4 Direction. Small HMOs (3–6 people): Usually fall under Class C4. In many areas, you can convert from a standard house (C3) to a C4 HMO using "Permitted Development" rights without full planning permission. However, many local councils have "Article 4 Directions" which remove these rights, meaning any conversion requires a full planning application. Large HMOs (7+ people): These are classed as Sui Generis and always require full planning permission.
Beyond national rules, every council has its own "Amenity Standards" document. An architect must design specifically for these, which cover: minimum room standards for kitchens, bathrooms, bedrooms and living areas as well as external space.
HMOs are higher-risk properties and must comply with Building Regulations Part B. An architect should include for fire doors. Usually FD30-rated doors with self-closers on all "protected routes" (hallways and bedroom doors). Alarm Systems: A Grade D, LD2 system (mains-powered, interconnected smoke alarms in all bedrooms and heat detectors in kitchens). Egress Windows: Ensuring ground and first-floor bedrooms have windows large enough for emergency escape.
This is a major concern because the UK government is tightening Energy Performance Certificate (EPC) standards. For HMOs, which are naturally high-energy usage properties, this is more than just a "green" goal—it's a legal requirement to trade. The Target: Most rental properties are now being pushed toward a minimum EPC rating of C. If your property is currently a D or E, an architect must integrate "fabric first" solutions into the conversion plans.
This is about Space Optimisation. An experienced HMO architect will look for dead Space: Converting large hallways or oversized landings into en-suites or storage. Re-configuring Layouts: Moving non-load-bearing walls to ensure every room hits the minimum sqm threshold without wasting space. En-suites: Adding "pods" to rooms to increase rental value, provided the remaining bedroom floor area still meets the minimum licensing standard.