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

Laurence Associates Attends Cornwall Council Planning Agents Forum

How to Finance a Self-Build

Laurence Associates at Kernow Construction Club

Feock replacement dwelling project overview

A Busy Week of Progress Across the Practice

Every Project Has More Than One Story to Tell

Visit Laurence Associates at the Devon County Show This Week

Architecture Vogue – Higher Harlyn

Best of Houzz 2017 Design Award

Natural Light

Laurence Associates – Royal Cornwall Show 2025

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

Laurence Associates Returning to the Royal Cornwall Show 2026

Understanding the Design Brief Service at Laurence Associates

Planning Approval Secured for Multi-Generational Home in Feock

Planning Approved for 5 Unrestricted Rural Homes

Cornwall Building Regulations Update Event 2026

Why Do I Need a Professional Consultant’s Certificate?

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Redruth Housing Scheme Approved

Building for Growth

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Construction (Design & Management) Regulations 2015 – March

Traditional Barn Conversion Approved | Building Regulations Success

Planning Permission for Community Garden Redevelopment in Newquay

A considered evolution of a familiar form

From Sketch to Reality: Architectural Visualisation

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Happy Easter from Laurence Associates

Current Vacancies – Town Planners

Section 73 Approval for Revised Bungalow Scheme in St Erth

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

Self-Build and Custom Build Homes with Laurence Associates

Porthcothan Site Update: Residential Planning Progress

Planning Permission Secured in Rock Cornwall

Planning Approved for Farmhouse Extension on Bodmin Moor

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Grand Designs

Cornwall Council Housing Requirement – Laurence Associates

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

Laurence Associates Welcomes New Planning Director

Celebrating 20 Years of Leadership – Richard Marsden

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Certificates of Lawfulness Explained

RIBA Safe & Healthy Environments CPD Completed

Barn Conversions Under Class Q and Class R

Designing for Approval or Designing to Build?

CESW Summit 2026

Why Part T Is Changing Commercial Design More Than You Think

Cornwall Council ‘Call For Sites’

Laurence Associates Attending Ashfords Business Breakfast

Team Attends Michelmore’s Property Development Club in Exeter

Attending Women in Business Breakfast at Truro Golf Club

Appeal Success Near St Ives

Planning Appeals Explained | What to Do If Your Planning Application Is Refused

Laurence Associates Attending Stithians Show 2026

Work Experience Week: Exploring Architecture and Structural Engineering

What is the Community Infrastructure Levy?

Outline Approval for Three New Homes in St Keyne

Class Q Planning Permission

Appeal Success for Agricultural Workers Dwelling Near Penzance

Housing Schemes in Cornwall That Truly Work for People

Neighbourhood Plan Regulation Changes 2026

Laurence Associates to Attend Business Fest

Laurence Associates Welcomes New Design Director

Coastal Home Design in Devon & Cornwall

Supporting the Interior Design Journey Through Architecture

Construction Excellence Southwest Summit 2026

Community Sponsorship St Just RFC

Tom Evans Promoted to Junior Planner

Grade II Listed Farmstead Planning Success

Cornwall Local Plan Update 2028 and What It Means for Development

Planning Appeal Success for Equestrian Building

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

A Collaborative Approach to Creating Meaningful Spaces

Bespoke Architectural Design Process

Coastal Cornish Home Design | Contemporary Architecture

Ana Coelho promoted to Senior Chartered Architect

Securing Planning Permission – Greenbank Hotel Falmouth

A Tailored Approach to Conceptual Design

Should I use an Architect?

Building Towards a Greener Future: Our Earth Day Commitment

Conversion in the Countryside: Securing Planning for a Rural Bothy

Design Appraisals UK | Site Feasibility and Planning Assessments

Replacement Dwellings – Pushing the boundaries of Architecture

Barn Conversion Approved West Cornwall

Planning Permission Success for Barn Conversion

Master Planning That Creates Places for the Future

Waterside Lookout

Planning Appeal Success in Cornwall National Landscape

New premises & 30 Years in the business

Powering the Future: Repowering Wind Turbines Across the UK

Non-Material Amendment Success

Architecture Vogue – Sand Dunes

Business Cornwall – March 2026

A Guide to Our Planning Application Process

Change of Use Approved: Takeaway to Residential in Cornwall

A positive appeal decision for Laurence Associates

Town Planner Job Vacancy in Truro | Laurence Associates

Regen Planning Conference

Architecture Vogue – Maen Valley

Laurence Associates attending Kernow Construction Club

Planning and Designing Padel Courts for the UK’s Fastest Growing Sport

Functional Living in a Contemporary Cornish Home

Visit Laurence Associates at the Royal Cornwall Show 2026

Navigating Building Regulations in Cornwall: A Design Led Approach

Replacement Dwelling Approved Following Class Q Success

Laurence Associates prepares for Royal Cornwall Show 2026

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

Progress Update: Shaping a Bespoke Home

Securing Five Unrestricted Homes in Mawgan Porth

Penzance Business Breakfast

Visit Laurence Associates at the Royal Cornwall Show 2026

Laurence Associates – Royal Cornwall Show 2024

Restronguet Point – a room with a view

Town Planner Vacancy – Planning Careers UK

Outline Planning Consent Secured for Two New Dwellings

Planning Committee Success: Replacement Dwelling Approved

Planning Committee Reforms in England What You Need to Know

Why Do a Self Build?

Energy Consultancy Services at Laurence Associates

Agricultural Barn Development Advice

Four Dwellings Approved Following Outline Consent

Property Development Forum

Cornish Replacement Dwelling Submitted for Building Regulations

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

Rural Enterprise – Helping Rural Business Flourish

Laurence Associates to Exhibit at Devon County Show 2026

Planning Success in Tintagel

Farm Diversification Opportunities in the Southwest

Laurence Associates Supports the Peloton Charity Golf Day 2026

Architecture Vogue – Humble Cottage

3D Modelling an image speaks a thousand words

Planning Permission Success for Access, Parking & Facilities

Planning Appeals Changes from April 2026

Successful Appeal Secured on Caravan Use and Building Definition

Committee Success Secures Permission in Principle for New Homes

Affordable Housing Success

Creating Flow and Connection Within the Home

Building for Growth

Rural Outbuilding Conversion Secures Planning Consent

Laurence Associates Attending Townsend Landowner Seminar

Replacement Dwelling in lieu of Class Q

Planning Appeal Success to Building Regulations Approval

How to Find a Building Plot

Planning Permission Secured for Padstow Conservation Area Outbuildings

Meet the Laurence Associates Team at Royal Cornwall Show 2026

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Architecture Vogue – Greenbank Hotel

Design and Placemaking PPG out now

Vickery Holman Market Review

Permission in Principle Success in St Austell

Energy Statements: Why They Matter for Planning Applications

Breaking Ground: New Project Progress

Securing Planning Permission – Community Hall Poundstock

Planning Approval for Sauna in Protected Landscape

The Experts

Property Development Forum

James Vivian Promoted to Associate Director

Final Days at the Devon County Show for Laurence Associates

Where Design Meets Detail: The Role of Materials in Architecture

Seamless Single Storey Extensions That Complement Your Home

International Women’s Day at Laurence Associates

Meet the Laurence Associates Team at Devon County Show 2026

Architecture Vogue – Enys Hill

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Seaside Sensation

Appeal Success – Removing Occupancy Condition

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Laurence Associates Expands with New Office in Exeter

Home Renovation Progress Falmouth

Housing Appeal Success in West Cornwall

Grid Connection Reform and what it means for Renewable Energy Projects

Considering a Home Extension?

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

Laurence Associates Featured in Salt Magazine

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Sensitive Dwelling Alterations Approved by Council

Current Vacancies – Senior Landscape Architect

Designing Homes Shaped by Landscape and Views in Rural Cornwall

Current Vacancies – Planner / Senior Planner

Rural Exception Scheme Approved in Perran Downs

Laurence Associates at Business Fest South West Westpoint

Elmhurst Energy CPD

Appeal Success: Caravan Site Approved in Cornwall

Current Progress on Site in Falmouth

Architecture Vogue – Smallridge Bros

Planning Appeal Success for Permission in Principle Scheme

Designing for Legacy, Lifestyle and Longevity

Architect Jobs in Cornwall | Architect Vacancy in Truro | Laurence Associates

Unlocking Potential Through Replacement

Architecture Vogue – Eyebrid

Small Housing Schemes

Eco development on the sand dunes at Hayle

From sketch to reality the power of visualisation in design development

National Planning Policy Framework

Planning Consent Secured for Methane-Capture Facility

Building Regulations Drawings: Why Detail Matters

Campsite Certificate and Replacement Dwelling Approval Cornwall

Cape Cornwall Club Redevelopment | Laurence Associates