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Building or transforming a home is one of the most significant investments most people will ever make. Done well, a professionally delivered design and project management service can increase the value of a property, improve how it functions for the people who live in it, and make the construction process significantly less stressful. Done poorly, it can result in delays, budget overruns, planning refusals, and a result that falls short of what was originally envisaged.
This guide explains what professional residential design services in the UK actually involve, when you need them, how the process works from first conversation to final completion, and what to look for when choosing the right practice for your project. It is written for homeowners, property investors, and developers who want to understand the full picture before committing to any service.
Residential design services cover a wide range of professional disciplines, and the scope of what is required depends on the type, size, and complexity of your project. A straightforward single-storey rear extension requires a different level of service to a full new-build dwelling or a listed building conversion.
MBH provides an in-house one-stop-shop service that brings together architectural design, interior design, 3D visualisation, cost consultancy, and project management under a single point of contact. Here is what each discipline contributes.
Architectural design covers the conceptual and technical work of shaping a building: its layout, form, structure, and relationship to its surroundings. For residential projects, this typically includes feasibility assessments, concept design, planning drawings for submission to the local planning authority, and detailed construction drawings once planning consent is secured. The design team considers functionality, light, space, structure, materials, and planning policy at every stage.
Interior design addresses the spaces within a building: the layout of rooms, the specification of finishes and materials, the selection of furniture and fittings, and the quality of light within each space. For residential projects, interior design is increasingly integrated with the architectural process from the outset, ensuring that the inside of a home is as carefully considered as the outside. MBH's in-house interior design team works alongside the design team from the concept stage onward.
Three-dimensional visualisation allows clients to see a realistic representation of their project before a single brick is laid. Photorealistic renders, interior walkthrough models, and street scene CGIs are used to support planning applications, facilitate client decision-making, and provide marketing materials for development projects. MBH produces 3D visualisations as a standard part of the design process on residential projects.
A cost consultant, sometimes referred to as a quantity surveyor, manages the financial side of a construction project. This includes preparing cost estimates at each design stage, developing bills of quantities for contractor tendering, evaluating bids, and managing costs during construction. Having an in-house cost consultant means that budget considerations are built into the design process from the start, rather than being a shock at tender stage.
Project management on a residential project covers the appointment and coordination of contractors, programme management, quality oversight during construction, budget tracking, and the management of practical completion. A dedicated project manager ensures that the design intent is delivered on site, that the programme is maintained, and that any issues are resolved quickly and efficiently.
Under UK law, projects involving more than one contractor require the appointment of a Principal Designer under the Construction (Design and Management) Regulations 2015 (CDM 2015). From October 2023, projects in England requiring Building Regulations approval also require a Principal Designer under the Building Safety Act framework. MBH provides this service and can hold both roles where appropriate.
The short answer is: for most projects of any scale, yes. While small permitted development works such as a modest garden shed or a like-for-like roof repair can be carried out without professional design input, the vast majority of residential building projects benefit significantly from professional involvement.
A well-designed extension does more than add floor space. It improves the flow of the existing building, maximises natural light, and integrates seamlessly with the original structure in terms of materials and proportion. A poorly designed extension can actually reduce the value of a property and create problems at the point of sale. Professional design input at the concept stage costs a fraction of what it saves in construction mistakes and planning refusals.
A loft conversion that is well-executed in design terms can transform a property. The design challenge is to integrate a new floor level into an existing roof structure in a way that provides usable, well-lit space without compromising the character of the building or falling foul of planning restrictions. Professional drawings are required for Building Regulations approval in all cases, and a planning application will be required in many.
A new-build home requires comprehensive professional services from site feasibility and planning through to detailed design, specification, and project management. The scope of design work is significantly greater than for an extension, and the investment in professional services is proportionately justified. MBH manages new-build residential projects from initial land assessment through to handover.
Listed buildings require listed building consent for any works that affect their character, both internally and externally. This is in addition to any planning permission that may be required. The design of works to listed buildings requires specialist knowledge of heritage conservation principles, sensitivity to existing fabric, and experience of working with conservation officers and heritage bodies. MBH has experience of designing works to listed buildings across residential and other sectors.
MBH's residential design capability extends beyond conventional housing to include healthcare facilities, educational buildings, and specialist residential projects. Our team understands the sector-specific requirements that apply to these building types, including compliance with the relevant technical standards and the specific needs of the people who will use them.
The residential design process follows a broadly consistent sequence of stages, regardless of project type or scale. The Royal Institute of British Architects (RIBA) publishes a Plan of Work that sets out these stages formally. MBH follows this framework on high-end private projects and adapts it for more straightforward commissions.
| Stage | What Happens | MBH's Role | Key Output |
|---|---|---|---|
| Stage 0 to 1 | Strategic definition and preparation: understand the brief, assess the site, establish feasibility and budget |
Site visits, feasibility report, initial cost estimate, brief development | Feasibility report and agreed brief |
| Stage 2 | Concept design: explore design options, establish the preferred approach, test against planning policy |
Design sketches, massing studies, planning pre-application if required | Concept design report and preferred scheme |
| Stage 3 | Spatial coordination: develop the preferred scheme into a coordinated set of drawings for planning submission |
Planning drawings, design and access statement, 3D visuals | Planning application submission |
| Stage 4 | Technical design: develop detailed construction information including structural, mechanical, and electrical coordination |
Construction drawings, specifications, building regulations application | Tender package and Building Regulations consent |
| Stage 5 | Construction: manage the build process, coordinate contractors, monitor quality and programme |
Site inspections, contractor liaison, cost reporting, variation management | Practical completion and snagging |
| Stage 6 | Handover: final inspections, O and M documentation, post-occupancy evaluation if required |
Defects inspection, health and safety file, handover documentation | Completed project |
Understanding when planning permission is required is one of the first questions that arises on any residential project. The rules are set out in the Town and Country Planning Act 1990 and the General Permitted Development Order (GPDO), and they can be complex. Here is a plain-English summary of the key principles.
Many minor residential works, including certain extensions, loft conversions, and outbuildings, can be carried out under permitted development rights, meaning that a planning application is not required. However, permitted development rights are subject to size limits, height limits, and distance conditions, and they do not apply to flats, listed buildings, or properties in conservation areas where Article 4 Directions have been made. MBH can advise quickly on whether your project qualifies for permitted development.
A full planning application is required when a project exceeds the permitted development limits, when the property is a listed building or in a conservation area, or when the nature of the development constitutes a material change of use. Planning decisions are made by the local planning authority (LPA) on the basis of local and national planning policy, design guidance, and the views of neighbours and other consultees.
The quality of a planning application has a significant bearing on its outcome. A well-prepared application includes accurate and well-presented drawings, a clear design and access statement, relevant supporting information such as heritage statements or transport assessments, and where appropriate, three-dimensional visualisations. MBH prepares planning applications with care and precision, and we manage the submission process and any subsequent liaison with the LPA on the client's behalf.
Building Regulations are a separate set of requirements from planning permission, and both may apply to the same project. Where planning permission controls the design and appearance of a building in relation to its surroundings, Building Regulations control the technical standards to which it is built.
Building Regulations cover structural integrity, fire safety, energy efficiency, ventilation, drainage, accessibility, and a range of other technical requirements. Compliance is not optional: failure to comply can result in enforcement action, and it can create serious problems at the point of sale if the necessary consents and completion certificates are not in place.
A Building Regulations application is typically submitted at detail design stage, once the planning consent has been secured. MBH prepares the technical drawings and specifications required for Building Regulations submission as part of our standard design service.
Interior design is often considered separately from architectural design, but in practice the two disciplines are most effective when they work together from the outset. Decisions about the layout of a room, the position of windows, the choice of structural materials, and the integration of services all affect the interior character of a space. Addressing these decisions in an integrated way produces better outcomes than treating them as separate exercises.
MBH's in-house interior design team works alongside our architectural designers from the concept stage. This integrated approach means that the specification of floors, walls, ceilings, joinery, and fittings is developed in harmony with the architectural design rather than overlaid on top of it.
Space planning addresses the arrangement of furniture, circulation routes, and use zones within a room or building. Good space planning makes a space feel larger, more functional, and more comfortable than poor space planning, regardless of the actual floor area. MBH's interior designers produce detailed space plans for each room as part of the design process.
The selection of materials and finishes has a significant impact on both the aesthetic and the practical performance of a space. Flooring, wall finishes, ceiling treatments, joinery, worktops, and sanitary ware all need to be specified with reference to the expected use of the space, the maintenance requirements, the client's aesthetic preferences, and the overall budget. MBH provides a comprehensive specification service, coordinated with the contractor's procurement programme.
One of the most significant advances in professional design services in recent years has been the integration of high-quality three-dimensional visualisation into the standard design process. For residential clients, 3D visualisation removes the uncertainty that comes with trying to interpret technical drawings and allows you to make informed decisions about your project before construction begins.
MBH produces photorealistic exterior renders, interior visualisations, and street scene CGIs as part of our design service. These images are produced using the same data that underpins the planning drawings and construction documents, which means they accurately represent the proposed scheme rather than an aspirational impression of it.
Budget management is one of the most common sources of stress on residential building projects. Unexpected costs, insufficient tender preparation, and poor procurement processes all contribute to budgets being exceeded. MBH's in-house cost consultancy service is designed to prevent this.
MBH's cost consultants prepare benchmarked cost estimates at each stage of the design process, from initial feasibility through to detailed design. This means that clients understand the likely cost of their project at every point, and that design decisions can be made with full financial awareness. If a design choice has cost implications, the client knows about it before it is committed, not after.
At the end of the detailed design stage, MBH prepares a comprehensive tender package including drawings, specifications, and where appropriate a bill of quantities. We manage the invitation to tender process, evaluate submitted bids against a consistent framework, and advise on contractor selection. This process typically results in competitive pricing and a clear basis for the construction contract.
During construction, MBH tracks expenditure against the contract sum and assesses the financial impact of any variations that arise. Monthly cost reports keep clients informed of their financial position. The goal is to reach practical completion at or within the agreed budget.
MBH is a multidisciplinary design and project management practice with over 65 years of experience. We have designed residential projects across a wide range of types, scales, and locations. Here is what makes us the right choice for your project.
It depends on the size, type, and location of the extension. Many residential extensions can be built under permitted development rights without a planning application, subject to size and height limits. However, if your property is a listed building, is in a conservation area, is a flat, or if the extension exceeds the permitted development limits, a planning application will be required. MBH can advise on the planning position for your specific project at the outset.
The statutory decision period for a householder planning application is eight weeks from validation. Major applications have a thirteen-week statutory period. In practice, decisions can take longer, particularly in busy planning authorities or on applications that require specialist consultation. MBH manages the submission process and maintains regular communication with the local planning authority to move applications forward as efficiently as possible.
Planning permission relates to whether a development is acceptable in terms of its design, scale, and impact on the surrounding area. Building Regulations approval relates to whether the construction meets the technical standards required by law, covering structure, fire safety, energy efficiency, and other technical matters. Both may apply to the same project, and both must be in place before construction begins.
Yes. Listed building consent is required for any works that affect the character of a listed building, both internally and externally. This applies regardless of whether planning permission is also required. The consent is granted by the local planning authority, often in consultation with Historic England. MBH has experience of designing and managing works to listed buildings and can manage the listed building consent process on your behalf.
Fees vary depending on the scope of services required, the scale and complexity of the project, and the disciplines involved. Architectural design fees are typically calculated as a percentage of the construction cost or as a fixed fee agreed at the outset. MBH provides a clear fee proposal at the beginning of each project, covering all disciplines involved. We do not charge for an initial feasibility conversation.
Yes. MBH provides a full project management service that covers contractor selection, contract administration, site monitoring, cost management, and practical completion. Clients who want a single point of accountability for the entire process can place that responsibility with MBH.
If a planning application is refused, the applicant has the option to appeal to the Planning Inspectorate or to submit a revised application addressing the reasons for refusal. MBH manages both routes and advises on the most appropriate course of action depending on the circumstances. A well-prepared application supported by strong design rationale and good quality visualisations significantly reduces the risk of refusal.
Yes. MBH's in-house interior design team works alongside our design team from the concept stage. This integrated approach produces better outcomes than treating architectural and interior design as separate exercises.
Whether you are planning an extension, a loft conversion, a full new build, or a more complex residential project, MBH is ready to help. We start with a straightforward feasibility conversation, so that you have a clear picture of what is involved before committing to any professional fee.
Tel: 01932 352 727
Email: mbh@mbhltd.com
Web: www.mbhltd.com/
Brook House
Apex Court
Camphill Rd
West Byfleet
Surrey
KT14 6SQ
t. 01932 352 727
e. mbh@mbhltd.com
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