RIBA Work Stages Explained for Homeowners

If you're planning a renovation, extension, or new-build project in Hampstead or the surrounding north London area, your architect will almost certainly structure their work around the RIBA Plan of Work. Understanding these stages gives you a clear picture of what to expect, when key decisions need to be made, and where your money goes at each point.

What Is the RIBA Plan of Work?

The RIBA Plan of Work 2020 is the definitive framework used by architects across the UK to organise the design and construction process. Published by the Royal Institute of British Architects, it breaks a building project into eight stages numbered 0 through 7. Each stage has defined tasks, deliverables, and decision points.

For homeowners, the value of understanding these stages is straightforward: it lets you hold your architect accountable to clear milestones, budget your fees with confidence, and know exactly when you need to make binding decisions.

Stage 0: Strategic Definition

This is the very beginning — before any design work starts. At Stage 0, you and your architect define what the project is actually trying to achieve. For a typical Hampstead residential project, this might involve discussing whether you need more living space, a better kitchen, or an additional bedroom. You'll consider whether an extension, a loft conversion, or a reconfiguration of existing space best meets your needs.

Typical duration: 1–2 weeks for a residential project.

Key deliverable: A project brief outlining your requirements, budget range, and programme expectations.

Gateway point: This is your first natural pause. If the strategic definition reveals the project isn't viable — perhaps the budget doesn't align with your ambitions — you can stop here with minimal cost.

Stage 1: Preparation and Briefing

At this stage, your architect conducts feasibility studies, reviews site constraints, and develops the project brief in more detail. For properties in Hampstead, this often involves checking conservation area restrictions, reviewing any Article 4 directions, and understanding the planning history of the property.

Typical duration: 2–4 weeks.

Key deliverables: Site appraisal, feasibility studies, and a detailed project brief.

Fees: Many architects charge a fixed fee for Stages 0–1 combined, often between £1,500 and £4,000 for a residential project, depending on complexity.

Stage 2: Concept Design

This is where the creative work begins in earnest. Your architect develops the initial design concept, exploring spatial arrangements, massing, and the overall architectural approach. You'll typically see floor plans, sections, and possibly 3D visualisations.

Typical duration: 3–6 weeks.

Key deliverables: Concept design drawings, outline specification, and a preliminary cost estimate.

Key decisions: You'll need to commit to a design direction. Changing your mind after this stage becomes progressively more expensive.

Gateway point: A strong pause point. If you want to test the market or reassess your budget based on the preliminary cost estimate, this is a sensible moment to do so.

Stage 3: Spatial Coordination

Formerly known as "Developed Design," Stage 3 is where the concept is refined and coordinated with structural engineering, mechanical and electrical services, and other specialist consultants. The design becomes much more detailed and technically resolved.

Typical duration: 4–8 weeks.

Key deliverables: Coordinated design drawings, updated cost plan, and an outline specification. Planning applications are typically submitted during or at the end of this stage.

Fees: Stages 2–3 together often represent 30–40% of the total architectural fee.

Key decisions: Material choices, window specifications, and structural solutions are broadly fixed by the end of this stage. For Hampstead conservation area projects, the external materials and design language need to be settled before planning submission.

Stage 4: Technical Design

Stage 4 produces the detailed technical drawings and specifications needed to build the project. This is the most intensive design stage and produces the information that contractors will price and build from.

Typical duration: 6–12 weeks for a residential project.

Key deliverables: Technical drawings, full specification, Building Regulations submission, and tender documentation.

Fees: Stage 4 typically accounts for 20–30% of the total architectural fee.

Key decisions: Every detail matters now — ironmongery, tile layouts, kitchen configurations, lighting positions. Decisions deferred from earlier stages must be resolved here.

Gateway point: Another important pause point. You'll have a full set of tender documents, so you can obtain accurate contractor quotes before committing to construction.

Stage 5: Manufacturing and Construction

This is the build itself. Your architect's role shifts to contract administration — issuing instructions, reviewing the contractor's work, valuing interim payments, and resolving problems on site.

Typical duration: Highly variable. A rear extension in Hampstead might take 4–6 months; a full house renovation could take 12–18 months.

Key deliverables: Site inspection reports, architect's instructions, interim payment certificates, and variation records.

Fees: Stage 5 fees are often charged monthly or as a percentage of the construction cost. Expect this stage to account for 15–25% of the total fee.

Key decisions: Changes during construction are costly. A robust technical design at Stage 4 minimises the need for on-site changes.

Stage 6: Handover

At practical completion, the contractor hands the building over to you. Your architect administers this process, inspecting the works, compiling a snagging list, and issuing the practical completion certificate.

Typical duration: 2–4 weeks for the handover process itself.

Key deliverables: Practical completion certificate, snagging list, health and safety file, and building manual (O&M documentation).

Fees: Usually included within the Stage 5 fee or as a small additional charge.

Stage 7: Use

Stage 7 covers the period after you've moved in. It includes the defects liability period (typically 6–12 months), during which the contractor must return to fix any defects that emerge. Your architect issues the final certificate and authorises the release of retention money to the contractor at the end of this period.

Typical duration: 12 months is standard for the defects liability period.

Key deliverables: Schedule of defects, final certificate, and retention release.

Some architects also offer post-occupancy evaluation, reviewing how the building performs against the original brief. This is particularly valuable for energy-efficient designs where predicted and actual performance should be compared.

How Fees Are Typically Structured

Architectural fees for residential projects in Hampstead generally range from 8% to 15% of the construction cost, depending on the project's complexity and the level of service provided. Fees can be structured as a percentage, a lump sum, or a combination of both.

Most architects break their fees down by stage, which gives you transparency and the ability to pause at gateway points without losing your investment in completed work. Always ensure your appointment letter clearly states the fee for each stage.

Where You Can Pause

The RIBA stages are designed with natural stopping points. The most common gateway points for residential projects are:

• After Stage 1 — if feasibility reveals fundamental constraints
• After Stage 2 — if the concept design doesn't meet expectations or the budget
• After Stage 4 — if tender returns exceed your budget

At each of these points, you own the work completed to date (subject to your appointment terms) and can choose to proceed, pause, or change direction.

Using This Framework When Selecting an Architect

When we connect you with architects through our service, we encourage homeowners to ask candidates how they structure their work against the RIBA stages. An architect who can clearly explain their process, deliverables, and fee breakdown stage by stage is demonstrating both professionalism and transparency. It's one of the most reliable indicators of a well-organised practice.

Understanding these stages puts you in a stronger position to manage your project confidently, ask the right questions, and make informed decisions at every milestone.