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

Replacement Dwellings – Pushing the boundaries of Architecture

How to Finance a Self-Build

Current Vacancies – Senior Landscape Architect

Laurence Associates attending Kernow Construction Club

Laurence Associates Welcomes New Design Director

Small Housing Schemes

The Experts

Property Development Forum

Architecture Vogue – Sand Dunes

Construction Excellence Southwest Summit 2026

Laurence Associates Attending Ashfords Business Breakfast

Planning Success in Tintagel

Laurence Associates Expands with New Office in Exeter

Supporting the Interior Design Journey Through Architecture

Replacement Dwelling Approved Following Class Q Success

Laurence Associates – Royal Cornwall Show 2024

Grade II Listed Farmstead Planning Success

Architecture Vogue – Eyebrid

Regen Planning Conference

Natural Light

Laurence Associates – Royal Cornwall Show 2025

Construction (Design & Management) Regulations 2015 – March

Appeal Success – Removing Occupancy Condition

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

Rural Exception Scheme Approved in Perran Downs

RIBA Safe & Healthy Environments CPD Completed

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Current Vacancies – Town Planners

Elmhurst Energy CPD

Business Cornwall – March 2026

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

Should I use an Architect?

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

Planning Consent Secured for Methane-Capture Facility

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

Energy Consultancy Services at Laurence Associates

Home Renovation Progress Falmouth

Attending Women in Business Breakfast at Truro Golf Club

Planning Approval for Sauna in Protected Landscape

Tom Evans Promoted to Junior Planner

Celebrating 20 Years of Leadership – Richard Marsden

A positive appeal decision for Laurence Associates

Planning Appeal Success in Cornwall National Landscape

Why Do a Self Build?

Ana Coelho promoted to Senior Chartered Architect

Penzance Business Breakfast

International Women’s Day at Laurence Associates

Designing for Legacy, Lifestyle and Longevity

Breaking Ground: New Project Progress

New premises & 30 Years in the business

Why Do I Need a Professional Consultant’s Certificate?

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Design and Placemaking PPG out now

Waterside Lookout

Architecture Vogue – Enys Hill

3D Modelling an image speaks a thousand words

Planning Appeals Changes from April 2026

Building Regulations Drawings: Why Detail Matters

Planning Committee Success: Replacement Dwelling Approved

Architecture Vogue – Maen Valley

National Planning Policy Framework

Cornwall Council ‘Call For Sites’

Restronguet Point – a room with a view

CESW Summit 2026

Laurence Associates at Kernow Construction Club

Securing Planning Permission – Community Hall Poundstock

Architecture Vogue – Greenbank Hotel

Cornwall Council Housing Requirement – Laurence Associates

Barn Conversion Approved West Cornwall

Class Q Planning Permission

Affordable Housing Success

Building for Growth

Bespoke Architectural Design Process

How to Find a Building Plot

Planning Permission Success for Access, Parking & Facilities

Outline Approval for Three New Homes in St Keyne

Outline Planning Consent Secured for Two New Dwellings

Property Development Forum

Housing Appeal Success in West Cornwall

Grid Connection Reform and what it means for Renewable Energy Projects

Architecture Vogue – Higher Harlyn

Agricultural Barn Development Advice

Planning Approved for 5 Unrestricted Rural Homes

Unlocking Potential Through Replacement

Rural Enterprise – Helping Rural Business Flourish

Cornwall Building Regulations Update Event 2026

Replacement Dwelling in lieu of Class Q

Current Vacancies – Planner / Senior Planner

Seaside Sensation

Laurence Associates Attending Townsend Landowner Seminar

Designing for Approval or Designing to Build?

Town Planner Vacancy – Planning Careers UK

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Architecture Vogue – Smallridge Bros

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

Four Dwellings Approved Following Outline Consent

Eco development on the sand dunes at Hayle

Appeal Success Near St Ives

Campsite Certificate and Replacement Dwelling Approval Cornwall

Planning Permission Success for Barn Conversion

Securing Planning Permission – Greenbank Hotel Falmouth

What is the Community Infrastructure Levy?

Best of Houzz 2017 Design Award

Laurence Associates Welcomes New Planning Director

Seamless Single Storey Extensions That Complement Your Home

Grand Designs

Building for Growth

Vickery Holman Market Review

A Collaborative Approach to Creating Meaningful Spaces

Change of Use Approved: Takeaway to Residential in Cornwall

Laurence Associates to Attend Business Fest

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

Community Sponsorship St Just RFC

Why Involve Landscape Architects in Biodiversity Net Gain Proposals