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

Progress Update: Shaping a Bespoke Home

Design Appraisals UK | Site Feasibility and Planning Assessments

Laurence Associates at Business Fest South West Westpoint

Four Dwellings Approved Following Outline Consent

Laurence Associates Welcomes New Design Director

Seaside Sensation

Grade II Listed Farmstead Planning Success

Happy Easter from Laurence Associates

Laurence Associates – Royal Cornwall Show 2024

Rural Outbuilding Conversion Secures Planning Consent

Appeal Success Near St Ives

Building Towards a Greener Future: Our Earth Day Commitment

Creating Flow and Connection Within the Home

Supporting the Interior Design Journey Through Architecture

Outline Approval for Three New Homes in St Keyne

Property Development Forum

Planning Approval Secured for Multi-Generational Home in Feock

Architecture Vogue – Higher Harlyn

Planning Committee Success: Replacement Dwelling Approved

Architecture Vogue – Eyebrid

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Designing for Legacy, Lifestyle and Longevity

International Women’s Day at Laurence Associates

Team Attends Michelmore’s Property Development Club in Exeter

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Regen Planning Conference

Section 73 Approval for Revised Bungalow Scheme in St Erth

Feock replacement dwelling project overview

Replacement Dwellings – Pushing the boundaries of Architecture

Should I use an Architect?

Waterside Lookout

Meet the Laurence Associates Team at Devon County Show 2026

Architecture Vogue – Greenbank Hotel

Cape Cornwall Club Redevelopment | Laurence Associates

Planning Success in Tintagel

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

Why Do a Self Build?

Laurence Associates Expands with New Office in Exeter

Planning Appeals Changes from April 2026

Barn Conversion Approved West Cornwall

Unlocking Potential Through Replacement

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Cornwall Council ‘Call For Sites’

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

Tom Evans Promoted to Junior Planner

Change of Use Approved: Takeaway to Residential in Cornwall

Current Vacancies – Planner / Senior Planner

Affordable Housing Success

Planning Approval for Sauna in Protected Landscape

3D Modelling an image speaks a thousand words

Construction (Design & Management) Regulations 2015 – March

Laurence Associates Attending Ashfords Business Breakfast

Property Development Forum

Bespoke Architectural Design Process

A Collaborative Approach to Creating Meaningful Spaces

Eco development on the sand dunes at Hayle

Architecture Vogue – Maen Valley

Conversion in the Countryside: Securing Planning for a Rural Bothy

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

Appeal Success: Caravan Site Approved in Cornwall

Home Renovation Progress Falmouth

Design and Placemaking PPG out now

Class Q Planning Permission

Porthcothan Site Update: Residential Planning Progress

RIBA Safe & Healthy Environments CPD Completed

Construction Excellence Southwest Summit 2026

Laurence Associates to Exhibit at Devon County Show 2026

Grand Designs

Laurence Associates Attending Townsend Landowner Seminar

Replacement Dwelling in lieu of Class Q

Our First Newsletter Is Live | Latest Projects, News & Events

The Experts

Planning Permission Secured in Rock Cornwall

Laurence Associates – Royal Cornwall Show 2025

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

How to Find a Building Plot

A positive appeal decision for Laurence Associates

Breaking Ground: New Project Progress

Rural Exception Scheme Approved in Perran Downs

Designing for Approval or Designing to Build?

Laurence Associates Returning to the Royal Cornwall Show 2026

Elmhurst Energy CPD

Final Days at the Devon County Show for Laurence Associates

Ana Coelho promoted to Senior Chartered Architect

Penzance Business Breakfast

Current Vacancies – Town Planners

Planning Permission for Community Garden Redevelopment in Newquay

Barn Conversions Under Class Q and Class R

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

Natural Light

Celebrating 20 Years of Leadership – Richard Marsden

Securing Planning Permission – Community Hall Poundstock

Powering the Future: Repowering Wind Turbines Across the UK

Planning Appeal Success in Cornwall National Landscape

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Permission in Principle Success in St Austell

Certificates of Lawfulness Explained

Rural Enterprise – Helping Rural Business Flourish

Architecture Vogue – Smallridge Bros

How to Finance a Self-Build

Why Part T Is Changing Commercial Design More Than You Think

Non-Material Amendment Success

Planning Permission Success for Access, Parking & Facilities

Housing Appeal Success in West Cornwall

A Guide to Our Planning Application Process

Understanding the Design Brief Service at Laurence Associates

Housing Schemes in Cornwall That Truly Work for People

From sketch to reality the power of visualisation in design development

Community Sponsorship St Just RFC

Best of Houzz 2017 Design Award

Appeal Success – Removing Occupancy Condition

Laurence Associates to Attend Business Fest

Laurence Associates at Kernow Construction Club

National Planning Policy Framework

Replacement Dwelling Approved Following Class Q Success

Farm Diversification Opportunities in the Southwest

Securing Five Unrestricted Homes in Mawgan Porth

Planning Permission Success for Barn Conversion

Why Do I Need a Professional Consultant’s Certificate?

Considering a Home Extension?

Restronguet Point – a room with a view

Architecture Vogue – Sand Dunes

Cornwall Building Regulations Update Event 2026

New premises & 30 Years in the business

Cornwall Council Housing Requirement – Laurence Associates

Where Design Meets Detail: The Role of Materials in Architecture

Cornwall Local Plan Update 2028 and What It Means for Development

Laurence Associates Welcomes New Planning Director

A considered evolution of a familiar form

Current Vacancies – Senior Landscape Architect

Neighbourhood Plan Regulation Changes 2026

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

Grid Connection Reform and what it means for Renewable Energy Projects

Seamless Single Storey Extensions That Complement Your Home

Agricultural Barn Development Advice

Building for Growth

Planning Consent Secured for Methane-Capture Facility

Visit Laurence Associates at the Devon County Show This Week

Attending Women in Business Breakfast at Truro Golf Club

CESW Summit 2026

Sensitive Dwelling Alterations Approved by Council

Town Planner Vacancy – Planning Careers UK

What is the Community Infrastructure Levy?

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Building Regulations Drawings: Why Detail Matters

Securing Planning Permission – Greenbank Hotel Falmouth

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

Current Progress on Site in Falmouth

Business Cornwall – March 2026

Laurence Associates attending Kernow Construction Club

Outline Planning Consent Secured for Two New Dwellings

Planning Approved for 5 Unrestricted Rural Homes

Successful Appeal Secured on Caravan Use and Building Definition

Energy Consultancy Services at Laurence Associates

Campsite Certificate and Replacement Dwelling Approval Cornwall

Vickery Holman Market Review

Architecture Vogue – Enys Hill

Small Housing Schemes

A Tailored Approach to Conceptual Design

Building for Growth