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

A Guide to Our Planning Application Process

A Collaborative Approach to Creating Meaningful Spaces

Rural Outbuilding Conversion Secures Planning Consent

Visit Laurence Associates at the Devon County Show This Week

Appeal Success – Removing Occupancy Condition

Cornwall Council Housing Requirement – Laurence Associates

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Ana Coelho promoted to Senior Chartered Architect

Planning Permission Secured in Rock Cornwall

Best of Houzz 2017 Design Award

Property Development Forum

Non-Material Amendment Success

CESW Summit 2026

Architecture Vogue – Higher Harlyn

Waterside Lookout

RIBA Safe & Healthy Environments CPD Completed

What is the Community Infrastructure Levy?

Designing for Approval or Designing to Build?

Barn Conversion Approved West Cornwall

3D Modelling an image speaks a thousand words

Planning Permission for Community Garden Redevelopment in Newquay

Grade II Listed Farmstead Planning Success

Class Q Planning Permission

Powering the Future: Repowering Wind Turbines Across the UK

Natural Light

Appeal Success Near St Ives

Laurence Associates Attends Cornwall Council Planning Agents Forum

Bespoke Architectural Design Process

Securing Planning Permission – Greenbank Hotel Falmouth

Laurence Associates attending Kernow Construction Club

Laurence Associates – Royal Cornwall Show 2024

Planning Permission Success for Access, Parking & Facilities

Construction (Design & Management) Regulations 2015 – March

Tom Evans Promoted to Junior Planner

Celebrating 20 Years of Leadership – Richard Marsden

Planning Consent Secured for Methane-Capture Facility

Design Appraisals UK | Site Feasibility and Planning Assessments

Successful Appeal Secured on Caravan Use and Building Definition

Architecture Vogue – Eyebrid

Unlocking Potential Through Replacement

How to Find a Building Plot

Architecture Vogue – Maen Valley

Cornwall Building Regulations Update Event 2026

Conversion in the Countryside: Securing Planning for a Rural Bothy

Understanding the Design Brief Service at Laurence Associates

Restronguet Point – a room with a view

Building Regulations Drawings: Why Detail Matters

Planning Committee Success: Replacement Dwelling Approved

Securing Planning Permission – Community Hall Poundstock

Happy Easter from Laurence Associates

Rural Exception Scheme Approved in Perran Downs

Building for Growth

Current Progress on Site in Falmouth

Energy Consultancy Services at Laurence Associates

A positive appeal decision for Laurence Associates

Seaside Sensation

New premises & 30 Years in the business

Laurence Associates at Business Fest South West Westpoint

Feock replacement dwelling project overview

Building Towards a Greener Future: Our Earth Day Commitment

Agricultural Barn Development Advice

Where Design Meets Detail: The Role of Materials in Architecture

Why Do I Need a Professional Consultant’s Certificate?

Current Vacancies – Planner / Senior Planner

Progress Update: Shaping a Bespoke Home

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Penzance Business Breakfast

Replacement Dwellings – Pushing the boundaries of Architecture

Planning Appeal Success in Cornwall National Landscape

Affordable Housing Success

Architecture Vogue – Enys Hill

Planning Approval Secured for Multi-Generational Home in Feock

Laurence Associates Returning to the Royal Cornwall Show 2026

Cape Cornwall Club Redevelopment | Laurence Associates

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

Current Vacancies – Town Planners

Housing Schemes in Cornwall That Truly Work for People

Section 73 Approval for Revised Bungalow Scheme in St Erth

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Laurence Associates Attending Townsend Landowner Seminar

Outline Planning Consent Secured for Two New Dwellings

Laurence Associates Welcomes New Design Director

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

Replacement Dwelling in lieu of Class Q

The Experts

Supporting the Interior Design Journey Through Architecture

Property Development Forum

Planning Approved for 5 Unrestricted Rural Homes

Laurence Associates Welcomes New Planning Director

Laurence Associates at Kernow Construction Club

Cornwall Council ‘Call For Sites’

Elmhurst Energy CPD

Laurence Associates to Exhibit at Devon County Show 2026

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Architecture Vogue – Greenbank Hotel

How to Finance a Self-Build

National Planning Policy Framework

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

Current Vacancies – Senior Landscape Architect

Building for Growth

A Tailored Approach to Conceptual Design

From sketch to reality the power of visualisation in design development

Change of Use Approved: Takeaway to Residential in Cornwall

Outline Approval for Three New Homes in St Keyne

Meet the Laurence Associates Team at Devon County Show 2026

Four Dwellings Approved Following Outline Consent

Neighbourhood Plan Regulation Changes 2026

Laurence Associates Attending Ashfords Business Breakfast

Laurence Associates to Attend Business Fest

Team Attends Michelmore’s Property Development Club in Exeter

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

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

Architecture Vogue – Sand Dunes

Porthcothan Site Update: Residential Planning Progress

Eco development on the sand dunes at Hayle

Grand Designs

Planning Appeals Changes from April 2026

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Grid Connection Reform and what it means for Renewable Energy Projects

Regen Planning Conference

Why Part T Is Changing Commercial Design More Than You Think

Appeal Success: Caravan Site Approved in Cornwall

Architecture Vogue – Smallridge Bros

Housing Appeal Success in West Cornwall

Small Housing Schemes

Barn Conversions Under Class Q and Class R

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

Breaking Ground: New Project Progress

Final Days at the Devon County Show for Laurence Associates

Considering a Home Extension?

Why Do a Self Build?

Planning Success in Tintagel

International Women’s Day at Laurence Associates

Attending Women in Business Breakfast at Truro Golf Club

Laurence Associates – Royal Cornwall Show 2025

Planning Approval for Sauna in Protected Landscape

Should I use an Architect?

Securing Five Unrestricted Homes in Mawgan Porth

Permission in Principle Success in St Austell

Certificates of Lawfulness Explained

Construction Excellence Southwest Summit 2026

Cornwall Local Plan Update 2028 and What It Means for Development

Planning Permission Success for Barn Conversion

Vickery Holman Market Review

Campsite Certificate and Replacement Dwelling Approval Cornwall

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

Home Renovation Progress Falmouth

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

Creating Flow and Connection Within the Home

Farm Diversification Opportunities in the Southwest

Business Cornwall – March 2026

Laurence Associates Expands with New Office in Exeter

Town Planner Vacancy – Planning Careers UK

Community Sponsorship St Just RFC

Sensitive Dwelling Alterations Approved by Council

Seamless Single Storey Extensions That Complement Your Home

Design and Placemaking PPG out now

Replacement Dwelling Approved Following Class Q Success

A considered evolution of a familiar form

Rural Enterprise – Helping Rural Business Flourish

Designing for Legacy, Lifestyle and Longevity