McNair Building Design — M&E Consultancy

How MBD Supports Your Project from Concept to Post‑Occupancy.

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At McNair Building Design (MBD), we provide clear, coordinated and technically robust Mechanical, Electrical and Public Health (MEP) design services across every RIBA Stage.

Whether you are a client, architect, developer or contractor, understanding how the RIBA Plan of Work aligns with building services design helps you plan budgets, reduce risk and secure a smoother delivery.

 

Below is a concise, client‑friendly explanation of each RIBA Stage, along with the typical MEP inputs we provide.

RIBA Stages 0–7

RIBA Stage 0 – Strategic Definition​

This is where the project vision is formed. The focus is on defining the need, exploring feasibility and establishing the strategic direction.

Typical MBD support includes:

  • Assist with Client Brief for M&E Services.
  • Advice on potential MEP strategies.
  • High‑level energy and sustainability considerations.
  • Initial constraints, risks and opportunities.
  • Budget guidance for building services options.

At this point, our role is to help you understand what is possible before committing to a preferred route.

RIBA Stage 1 – Preparation & Briefing

The project brief is developed and refined. Site information is gathered, and early technical risks are identified.

Typical MBD services at RIBA Stage 1:

  • Site surveys and M&E Condition Reports.
  • Early‑stage MEP feasibility studies.
  • Energy performance and compliance advice.
  • Outline MEP strategies aligned with budget and programme.
  • Support in defining sustainability outcomes and client requirements.

This stage ensures the brief is technically sound before design work begins.

RIBA Stage 2 – Concept Design

The architectural concept is established, and the first coordinated MEP strategies are developed.

Typical MBD services at RIBA Stage 2:

  • Concept MEP system selection.
  • High‑level load assessments.
  • Space planning for plant and risers.
  • Low and Zero Carbon (LZC) studies.
  • Passivhaus / low‑energy design input.
  • Early costed options for mechanical and electrical systems.

This is where key decisions are made that influence cost, carbon and long‑term performance.

RIBA Stage 3 – Spatially Coordinated Design

The design becomes more detailed, and spatial coordination between architecture, structure and MEP systems is established.

Typical MBD services at RIBA Stage 3:

  • Spatially coordinated MEP layouts.
  • Performance specifications for tender.
  • Utility applications and load confirmations.
  • SBEM / BRUKL calculations.
  • 3D modelling and clash‑avoidance coordination.

Stage 3 ensures the design is technically robust and ready for procurement.

RIBA Stage 4 – Technical Design

This is the detailed design stage, where full MEP calculations, drawings and specifications are produced.

Typical MBD services at RIBA Stage 4:

  • Detailed MEP design packages.
  • Equipment selection and schedules.
  • Fully coordinated 3D models.
  • Tender specifications and employer’s requirements.
  • Building Regulations submissions.

This is the stage where precision matters. Our drawings and models are produced to a level that supports accurate pricing, fabrication and installation.

RIBA Stage 5 – Construction

The project moves to site. The design must be fully coordinated, buildable and supported throughout installation.

Typical MBD services at RIBA Stage 5:

  • Construction‑level working drawings.
  • BIM coordination and model updates.
  • Site inspections and technical queries.
  • Off‑site fabrication support.
  • Commissioning oversight and quality checks.

Our proactive site support helps avoid delays, rework and cost escalation.

RIBA Stage 6 – Handover & Close‑Out

The building is completed, tested and handed over to the client.

Typical MBD services at RIBA Stage 6:

  • As‑fitted drawing support.
  • O&M manual support.
  • Energy performance certification.
  • Metering strategies and compliance documentation.
  • Final inspections and snag resolution.

We ensure the building is handed over with clear, accurate and complete MEP information.

RIBA Stage 7 – Use & Post‑Occupancy

Once the building is in use, performance is reviewed and lessons are captured.

Typical MBD services at RIBA Stage 7:

  • Post‑Occupancy Evaluation (POE).
  • Energy and comfort performance reviews.
  • Facilities management support.
  • Fine‑tuning of building services.
  • Verification of sustainability outcomes.

This stage closes the loop and ensures the building performs as intended.

Why Early Engagement with MBD Makes a Measurable Difference

Engaging MBD from the earliest stages delivers significant value:

  1. Better Cost Certainty – Early MEP input prevents late‑stage redesigns, reduces risk allowances and supports accurate budgeting.
  2. Stronger Sustainability Outcomes – Low‑energy strategies, LZC technologies and compliance pathways are far more effective when embedded from Stage 0–2.
  1. Reduced Coordination Risk – Early spatial planning for plant, risers and distribution routes avoids clashes and costly rework later.
  1. Faster Programme Delivery – Clear, coordinated design information accelerates procurement, fabrication and installation.
  1. A Single, Consistent Technical Voice – From concept to post‑occupancy, you benefit from one team who understands the project inside out.

Partner with MBD from Day One

Whether you’re planning a new development, refurbishment or complex technical upgrade, early engagement with McNair Building Design ensures your project is grounded in clear strategy, robust engineering and coordinated delivery.

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Make an enquiry

If you have a project that MBD can assist you with, please get in touch using contact form below.

McNair Building Design (MBD). Specialists in renewable energy, low‑carbon technologies, and building services engineering. Expert guidance, compliant design, and end‑to‑end technical support for commercial and residential projects.

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