RIBA Plan of Work: Simple Guide
We help landowners and homeowners extend their homes, build eco-homes, and create unique homestays that gain planning permission, perform well, and pay them back. RIBA Chartered Architects.
RIBA Plan of Work: A Step-by-Step Guide for Self-Builds and Eco-Homes
Building or extending your own home can be a confusing process, from planning permission to keeping track of budgets and timelines. The RIBA Plan of Work is the industry's roadmap from first sketch to moving in, a framework that should be followed by every consultant on a project: planners, engineers, cost consultants and architects. A RIBA Chartered Architect coordinates it, and the role extends well beyond design: managing each work stage, coordinating consultants, resolving issues as they arise, and mitigating risk throughout.
In this guide, we break down the eight stages of the RIBA Plan of Work and explain what happens at each point on a self-build or small residential project. I will then show you how we deliver those eight stages as four clear steps.
The RIBA Small Project Plan of Work outlines the eight key stages of a building project, from initial strategy through to completion and aftercare. This framework is tailored for smaller, bespoke builds such as eco-holiday homes, home extensions and self-builds.
Why Use the RIBA Plan of Work for Small Projects?
The value of the RIBA Plan of Work on smaller projects lies in timing and decision-making. It makes sure the key questions around planning, cost, sustainability and build strategy are answered early, before changes become expensive or disruptive. A simplified structure keeps you and your architect aligned, keeps programmes realistic, and reduces the risk of scope creep during design and construction.
Crucially, the small-project version does not dilute professional standards. It still embeds planning strategy, regulatory compliance and environmental performance into the process, the same rigour as a larger scheme, applied in proportion.
The ususal route asks that you appoint an architect in full.
How We Deliver It: Eight Stages, Four Steps
The RIBA Plan of Work is the industry map; however, it is not how a project gets delivered.
The usual route asks you to appoint an architect in full before establishing what your bank will lend, what your site will take, what it will cost, or whether it is worth doing at all. The issue with this is you find out whether the project was worth doing far later, around Stage 4, when changing course becomes particularly expensive. Sometimes, the result is the wrong project, delivered competently.
Step 1 — Pre-Design (Stages 0–1). What your site will take, a calculation on costs, and whether it's worth doing — before you commit to anything. The fee for the Pre-Design Report is deductible against the full appointment. If the answer is "don't build," you find out here, for the price of a report rather than the price of a planning refusal.
Step 2 — Design & Planning (Stages 2–3). A design shaped around you, the right planning route confirmed, consent secured.
Step 3 — Technical & Tender (Stage 4). Drawn in full, then tendered for the real price and the right builder appointed. Most cost overruns are born in thin Stage 4 information.
Step 4 — Construction (Stages 5–6). We stay on site for you, catching problems before they're built in, through to handover. Stage 7, the building in use, is one we take more seriously than most: we operate a holiday home we designed and built, so the lessons of year one, two and three feed back into every project that follows.
RIBA Stage 0: Strategic Definition
In my view, Stage 0 is the most critical stage of the RIBA Plan of Work, yet it is often the stage most likely to be skipped or undermined. Stage 0 is about establishing what is feasible: which parts of the site can be built on, how natural light can be maximised, and how best to orient the building to capture views, or simply where to extend an existing property.
It is also the point at which the project budget, planning constraints, and potential return on investment should be properly assessed. If you have not yet purchased the property or land, Stage 0 provides a valuable opportunity to test the viability of the project before committing.
Most importantly, Stage 0 makes sure you and your architect share a clear, aligned vision before design begins. This is the work our Pre-Design & Feasibility Report covers.
Early-stage feasibility sketch prepared at RIBA Stage 0, analysing site constraints, access, sun paths, landscape features, and building orientation to inform strategic design decisions before planning or purchase
RIBA Stage 1: Preparation and Brief
The aim of Stage 1 is to create a clear, workable brief that gives the project the best possible start. Stage 1 requires client feedback and consultation. This is where you work closely with your architect to establish a clear understanding of what you want to achieve and what you need from the project.
At this stage, the brief is developed in detail: how many bedrooms are required, where they might be located, how spaces relate to one another, how natural light is introduced, and the overall quality and feel of the spaces. This might include discussions around skylights, window positions, and how the new spaces connect to the existing house.
It is also the point at which early design preferences are explored, such as material choices and architectural reference, whether that is mid-century, Scandinavian, or a more contemporary approach. For eco-homes, this stage will also begin to consider energy performance and sustainability requirements at a high level.
By the end of Stage 1, you will have a clearly defined project brief and a solid understanding of what is achievable. This information is critical to the success of the later design stages and, ultimately, the construction of the project.
RIBA Stage 1: Preparation and Brief – Illustrated aerial view showing potential locations for elevated timber holiday cabins. This stage helps visualise how a project could sit within its landscape, guiding early design, feasibility, and planning decisions.
RIBA Stage 2: Concept Design
RIBA Stage 2 is where the project’s strategic ideas are translated into a coherent design concept. Working closely with your architect, the overall form, layout, and character of the building are developed, establishing how the project will function, look, and feel.
At this stage, the architect explores massing, spatial arrangement, and orientation, alongside initial structural principles, material approaches, and key architectural features. These proposals are tested against the site constraints, planning context, and budget, with early cost checks used to confirm that the concept remains viable.
Stage 2 is also where core project strategies are set. This includes high-level approaches to sustainability and energy performance, planning risk, access and servicing, and buildability. The aim is to ensure the design is compelling and grounded in practical and technical realities.
This is the stage most people associate with “design”. However, its real value lies in making the right decisions early, locking in the fundamental design direction before technical detail begins.
RIBA Stage 2: Concept Design, exploring the vision in 3D. At this stage, we bring ideas to life with concept visuals, looking at form, layout, and how the building sits in its landscape, balancing creativity with early cost and feasibility checks.
RIBA Stage 3: Spatial Coordination
This is where the concept design is developed into a coordinated and fully resolved proposal. The architect refines the design, coordinating structural principles, building services strategies, and material selections so that the project works as a cohesive whole.
At this stage, cost information and project strategies are updated to ensure the design remains aligned with the agreed brief, programme, and budget. Key decisions are tested and confirmed, reducing uncertainty before the project moves into technical detailing.
RIBA Stage 3 is typically the point at which a planning application is submitted, or where confirmation of Permitted Development rights is sought, depending on the site and project constraints.
Once Stage 3 is signed off, the overall design intent is effectively fixed. Significant changes beyond this point are likely to be more time-consuming and costly, which is why the design must be carefully reviewed and agreed upon before progressing to the technical design stage.
In practice, this is often one of the most rewarding stages, as the project evolves from a concept into a clear, coordinated design that is ready to be taken forward for construction.
RIBA Stage 3: Developed Design: An interior cutaway of the Monocoque Cabin, a project we designed, showing how the flowing timber frame, curved ceiling, and bespoke joinery come together in a fully resolved design. At this stage, every detail is coordinated, from structure and layout to finishes and fittings, ready for technical development and construction.
RIBA Stage 4: Technical Design
RIBA Stage 4 is where the project is technically developed and prepared for construction. At this stage, detailed technical drawings, coordinated specifications, and Building Control information are produced to enable the works to be built on site.
Architectural elements are resolved and coordinated with structural and building services information. Where appropriate, specialist subcontractor design input is integrated to ensure the project complies with statutory requirements and can be constructed efficiently.
By the end of Stage 4, the design information is sufficiently detailed to allow construction to proceed, significantly reducing the risk of delays, cost overruns, or unforeseen issues on site. In practice, a well-executed Stage 4 is one of the most effective ways of safeguarding a project once construction begins.
RIBA Stage 4: Technical Design: A detailed section drawing of the Monocoque Cabin’s curved wall, illustrating the build-up from foundation to finish. Every layer, from cedar shingles to insulation and vapour barriers, is precisely specified at this stage to ensure accuracy, compliance, and a seamless build process.
RIBA Stage 5: Manufacturing and Construction
RIBA Stage 5 covers the construction phase of the project. This includes both off-site manufacturing, where components may be fabricated in controlled conditions, and on-site construction, where the building is assembled in accordance with the agreed programme.
At this stage, works are carried out in line with the technical design information developed at Stage 4. Roles and responsibilities are clearly defined, and progress is managed against the construction programme, cost plan, and quality requirements.
Any necessary clarifications or minor adjustments are addressed as they arise, with ongoing coordination between the architect and contractor; this is known as “Construction Administration”.
RIBA Stage 5: Construction: The Monocoque Cabin is being assembled on-site, taking shape, with skilled trades assembling its precision-cut timber panels on-site after off-site fabrication, ensuring speed, accuracy, and minimal disruption.
RIBA Stage 6: Handover
RIBA Stage 6 marks the transition from construction to occupation. At this stage, the building works are completed, final inspections are carried out, and any outstanding defects or snagging items are addressed.
The necessary handover information is assembled and issued, including as-built drawings, warranties, certificates, and operation and maintenance manuals. This information enables the building to be used, operated, and maintained as intended.
Stage 6 formally concludes the construction process and confirms that the project has been delivered in accordance with the agreed design and contractual requirements, allowing the client to take full possession of the building with confidence.
RIBA Stage 7: Use
RIBA Stage 7 focuses on how the building performs once it is occupied and in use. This stage involves reviewing the building in operation, gathering feedback, and assessing whether it is performing as intended in terms of comfort, energy use, durability, and day-to-day functionality.
Post-occupancy evaluation at this stage can identify opportunities to fine-tune building performance, address any operational issues, and ensure that the building continues to meet the original project objectives over time.
Although Stage 7 is not always formally undertaken, it can be particularly valuable for repeat projects or developments intended to be replicated. Lessons learned at this stage can inform future design decisions, improve efficiency, and strengthen long-term outcomes across subsequent schemes.
For projects such as luxury holiday homes or scalable developments, Stage 7 provides practical, real-world insight that can directly influence the success and resilience of future projects.
RIBA Stage 7: In Use Monocoque Cabin in its natural setting, thriving post-occupancy. This stage captures real-world performance and guest experience, helping fine-tune design and functionality for long-term success.
RIBA Chartered Architects:
If you’ve got this far into the article and are considering the appointment of an architect for your own project, we are a RIBA Chartered architecture practice based in Birmingham.
We work directly with private clients and developers on self-builds, extensions, and small residential projects, typically within a 120-mile radius of our Birmingham office. You will work directly with the architect throughout the process, from early feasibility and briefing through to completion.
