The Construction (Design and Management) Regulations 2015 came into effect in April 2015, following a lengthy consultation process, and replacing CDM 2007. 

The HSE has published Legal Series guidance supporting CDM 2015 and explains it in more detail.

The key changes to note are:

Removal of the CDMC role and the introduction of a new role of the Principal Designer:

The 2015 CDM Regulations saw the introduction of a new role of Principal Designer. The Principal Designer will undertake the majority of duties of what was the CDM Coordinator, although the client will be responsible for collating relevant pre-construction information and making sure it’s communicated to all roles. The role of Principal Designer could be an organisation providing the Principal Designer role, the architect, client’s agent, or a project manager.

Domestic clients (homeowners) are no longer exempt:

The 2015 CDM Regulations apply to domestic client projects (ie homeowners having construction work carried out on their property). However, domestic clients can choose to transfer their duties to the contractor or principal contractor (if more than one contractor is working on the project).

Alternatively, the homeowner may choose to have a written agreement with a Principal Designer to fulfill the duties.

Removal of the Approved Code of Practice (ACOP):

The HSE has published guidance which replaces the requirement for an Approved Code of Practice.  In addition, CONIAC (Construction Industry Advisory Committee) has issued a set of industry guidelines for each of the roles under the 2015 Regulations.

Threshold for Notification Amended:

The 2015 Regulations have been aligned with EU legislation requiring notification to the HSE whenever a project is expected to last more than 30 working days and more than 20 workers simultaneously.

Appointment of Duty Holders (Principal Designer & Principal Contractor):

As soon as is practicable, the client must formally appoint a Principal Designer and Principal Contractor respectively when there is, or will be, more than one contractor on site,  and, in any event, before the start of the construction phase.

Replacement of the competency requirements:

Under the 2015 Regulations, the explicit competence requirements have been removed and replaced with a requirement for appropriate skills, knowledge and experience.

Please contact Jason Pledger to discuss the regulations further, or if you would like us to provide you with a scope of work and a fee estimate for acting as the Principal Designer.

All posts

Eco development on the sand dunes at Hayle

Outline Planning Consent Secured for Two New Dwellings

Planning Approval for Sauna in Protected Landscape

Progress Update: Shaping a Bespoke Home

From sketch to reality the power of visualisation in design development

Affordable Housing Success

Planning Permission Success for Barn Conversion

Planning Appeal Success in Cornwall National Landscape

New premises & 30 Years in the business

Laurence Associates attending Kernow Construction Club

National Planning Policy Framework

Planning Permission Secured in Rock Cornwall

Design Appraisals UK | Site Feasibility and Planning Assessments

Property Development Forum

Neighbourhood Plan Regulation Changes 2026

Laurence Associates Welcomes New Design Director

Town Planner Vacancy – Planning Careers UK

Why Part T Is Changing Commercial Design More Than You Think

What is the Community Infrastructure Levy?

Replacement Dwelling in lieu of Class Q

Ana Coelho promoted to Senior Chartered Architect

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Why Do a Self Build?

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Grand Designs

Celebrating 17 Years of Dedication: James Vivian, Associate Chartered Architectural Technologist

How to Finance a Self-Build

Cornwall Local Plan Update 2028 and What It Means for Development

RIBA Safe & Healthy Environments CPD Completed

Laurence Associates – Royal Cornwall Show 2025

Architecture Vogue – Smallridge Bros

How to Find a Building Plot

St Piran’s Day 2026 – Celebrating Cornwall’s Heritage

Bespoke Architectural Design Process

Cornwall Council ‘Call For Sites’

What does the new Part O of the Building Regulations mean for a new home?

Grid Connection Reform and what it means for Renewable Energy Projects

Laurence Associates Welcomes New Planning Director

Graphisoft UK Awards 2024 – Small Project Of The Year: Under £5 Million

A Guide to Our Planning Application Process

Planning Committee Success: Replacement Dwelling Approved

Conversion in the Countryside: Securing Planning for a Rural Bothy

Rural Exception Scheme Approved in Perran Downs

3D Modelling an image speaks a thousand words

Housing Schemes in Cornwall That Truly Work for People

Building for Growth

Natural Light

Permission in Principle Secured for 4 to 9 Dwellings in North Hill

Home Renovation Progress Falmouth

Architecture Vogue – Sand Dunes

Why Do I Need a Professional Consultant’s Certificate?

Grade II Listed Farmstead Planning Success

Planning Approval Secured for Multi-Generational Home in Feock

Current Vacancies – Senior Landscape Architect

Planning Success in Tintagel

Outline Approval for Three New Homes in St Keyne

Replacement Dwellings – Pushing the boundaries of Architecture

Vickery Holman Market Review

Laurence Associates Expands with New Office in Exeter

Celebrating 20 Years of Leadership – Richard Marsden

Current Vacancies – Planner / Senior Planner

Supporting the Interior Design Journey Through Architecture

Rural Enterprise – Helping Rural Business Flourish

Planning Permission Success for Access, Parking & Facilities

International Women’s Day at Laurence Associates

Elmhurst Energy CPD

A Collaborative Approach to Creating Meaningful Spaces

Breaking Ground: New Project Progress

Seaside Sensation

Construction (Design & Management) Regulations 2015 – March

Securing Planning Permission – Greenbank Hotel Falmouth

Design and Placemaking PPG out now

Energy Consultancy Services at Laurence Associates

Creating Flow and Connection Within the Home

Housing Appeal Success in West Cornwall

Agricultural Barn Development Advice

Appeal Success: Caravan Site Approved in Cornwall

Powering the Future: Repowering Wind Turbines Across the UK

Laurence Associates at Business Fest South West Westpoint

Designing for Legacy, Lifestyle and Longevity

Planning Permission for Community Garden Redevelopment in Newquay

Architecture Vogue – Greenbank Hotel

Waterside Lookout

Building Towards a Greener Future: Our Earth Day Commitment

Class Q Planning Permission

Laurence Associates Attending Ashfords Business Breakfast

Construction Excellence Southwest Summit 2026

Architecture Vogue – Eyebrid

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Seamless Single Storey Extensions That Complement Your Home

Laurence Associates – Royal Cornwall Show 2024

Change of Use Approved: Takeaway to Residential in Cornwall

Regen Planning Conference

Building Regulations Drawings: Why Detail Matters

Best of Houzz 2017 Design Award

Successful Appeal Secured on Caravan Use and Building Definition

Replacement Dwelling Approved Following Class Q Success

Happy Easter from Laurence Associates

Appeal Success – Removing Occupancy Condition

Cornwall Council Housing Requirement – Laurence Associates

Planning Appeals Changes from April 2026

Cornwall Building Regulations Update Event 2026

Laurence Associates at Kernow Construction Club

Attending Women in Business Breakfast at Truro Golf Club

A Tailored Approach to Conceptual Design

Barn Conversion Approved West Cornwall

A considered evolution of a familiar form

Architecture Vogue – Maen Valley

Appeal Success Near St Ives

Cape Cornwall Club Redevelopment | Laurence Associates

Property Development Forum

Small Housing Schemes

Laurence Associates to Attend Business Fest

Community Sponsorship St Just RFC

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Designing for Approval or Designing to Build?

A positive appeal decision for Laurence Associates

Restronguet Point – a room with a view

Planning Approved for 5 Unrestricted Rural Homes

The Experts

Penzance Business Breakfast

Securing Planning Permission – Community Hall Poundstock

Planning Consent Secured for Methane-Capture Facility

Current Vacancies – Town Planners

Securing Five Unrestricted Homes in Mawgan Porth

Where Design Meets Detail: The Role of Materials in Architecture

Should I use an Architect?

Tom Evans Promoted to Junior Planner

Unlocking Potential Through Replacement

Campsite Certificate and Replacement Dwelling Approval Cornwall

Planning changes from April 2026: why expert advice matters more than ever

CESW Summit 2026

Architecture Vogue – Higher Harlyn

Barn Conversions Under Class Q and Class R

Four Dwellings Approved Following Outline Consent

Laurence Associates Attending Townsend Landowner Seminar

Building for Growth

Business Cornwall – March 2026

Architecture Vogue – Enys Hill

River Camel Nutrient Neutrality Update 2026: Bodmin Removed