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

Sensitive Dwelling Alterations Approved by Council

Bespoke Architectural Design Process

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

Housing Appeal Success in West Cornwall

Laurence Associates to Exhibit at Devon County Show 2026

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

Town Planner Vacancy – Planning Careers UK

Laurence Associates Expands with New Office in Exeter

Architecture Vogue – Humble Cottage

Final Days at the Devon County Show for Laurence Associates

Cape Cornwall Club Redevelopment | Laurence Associates

Energy Consultancy Services at Laurence Associates

Building Towards a Greener Future: Our Earth Day Commitment

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

Planning Appeal Success for Equestrian Building

Planning Permission Success for Access, Parking & Facilities

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

A Collaborative Approach to Creating Meaningful Spaces

Coastal Cornish Home Design | Contemporary Architecture

Design Appraisals UK | Site Feasibility and Planning Assessments

Securing Planning Permission – Greenbank Hotel Falmouth

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Laurence Associates Attending Ashfords Business Breakfast

Planning Permission Success for Barn Conversion

Waterside Lookout

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Happy Easter from Laurence Associates

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Appeal Success for Agricultural Workers Dwelling Near Penzance

Exploring Contemporary Materials and Colour in Cornish Architecture

Team Attends Michelmore’s Property Development Club in Exeter

Why Do a Self Build?

RIBA Safe & Healthy Environments CPD Completed

Section 73 Approval for Revised Bungalow Scheme in St Erth

Conversion in the Countryside: Securing Planning for a Rural Bothy

Appeal Success – Removing Occupancy Condition

A Guide to Our Planning Application Process

Planning Permission for Community Garden Redevelopment in Newquay

Planning Success in Tintagel

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

Architecture Vogue – Eyebrid

Seaside Sensation

The Experts

Planning Appeal Success to Building Regulations Approval

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Town Planner Job Vacancy in Truro | Laurence Associates

Rural Outbuilding Conversion Secures Planning Consent

Breaking Ground: New Project Progress

Property Development Forum

National Planning Policy Framework

Laurence Associates at Stithians Show 2026

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Planning Approved for Farmhouse Extension on Bodmin Moor

Architecture Vogue – Higher Harlyn

Laurence Associates Attends Cornwall Council Planning Agents Forum

Laurence Associates Supports the Peloton Charity Golf Day 2026

Porthcothan Site Update: Residential Planning Progress

Why Part T Is Changing Commercial Design More Than You Think

Cornwall Local Plan Update 2028 and What It Means for Development

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

3D Modelling an image speaks a thousand words

Eco development on the sand dunes at Hayle

James Vivian Promoted to Associate Director

Coastal Home Design in Devon & Cornwall

Construction Excellence Southwest Summit 2026

Planning Appeals Changes from April 2026

Small Housing Schemes

Neighbourhood Plan Regulation Changes 2026

Penzance Business Breakfast

Current Progress on Site in Falmouth

Vickery Holman Market Review

Construction (Design & Management) Regulations 2015 – March

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Natural Light

New premises & 30 Years in the business

Planning Committee Reforms in England What You Need to Know

Planning Appeal Success in Cornwall National Landscape

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

Creating Flow and Connection Within the Home

Architecture Vogue – Greenbank Hotel

A Busy Week of Progress Across the Practice

Affordable Housing Success

Outline Planning Consent Secured for Two New Dwellings

Ana Coelho promoted to Senior Chartered Architect

Architecture Vogue – Enys Hill

Attending Women in Business Breakfast at Truro Golf Club

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Laurence Associates at Kernow Construction Club

Laurence Associates Attending Stithians Show 2026

Housing Schemes in Cornwall That Truly Work for People

Work Experience Week: Exploring Architecture and Structural Engineering

Laurence Associates Welcomes New Planning Director

Elmhurst Energy CPD

Principal Designer Services | CDM 2015 Compliance

Securing Five Unrestricted Homes in Mawgan Porth

Unlocking Potential Through Replacement

Laurence Associates Returning to the Royal Cornwall Show 2026

Powering the Future: Repowering Wind Turbines Across the UK

Building for Growth

Non-Material Amendment Success

Current Vacancies – Planner / Senior Planner

Visit Laurence Associates at the Devon County Show This Week

Home Renovation Progress Falmouth

From Sketch to Reality: Architectural Visualisation

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Planning consent secured for replacement wind turbine

Considering a Home Extension?

How to Finance a Self-Build

Design and Placemaking PPG out now

Supporting the Interior Design Journey Through Architecture

Class Q Planning Permission

Architecture Vogue – Sand Dunes

Community Sponsorship St Just RFC

Business Cornwall – March 2026

Redruth Housing Scheme Approved

Master Planning That Creates Places for the Future

What is the Community Infrastructure Levy?

Planning Approval for Sauna in Protected Landscape

Restronguet Point – a room with a view

Planning Appeal Success for Permission in Principle Scheme

Current Vacancies – Town Planners

Cornwall Council ‘Call For Sites’

Four Dwellings Approved Following Outline Consent

Replacement Dwellings – Pushing the boundaries of Architecture

Planning Permission Secured for Change of Use to self-contained letting unit in Penzance

Where Design Meets Detail: The Role of Materials in Architecture

Laurence Associates Attending Townsend Landowner Seminar

Planning Permission Secured in Rock Cornwall

CESW Summit 2026

How to Find a Building Plot

Architecture Vogue – Maen Valley

Traditional Barn Conversion Approved | Building Regulations Success

Permission in Principle Success in St Austell

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

Replacement Dwelling in lieu of Class Q

From sketch to reality the power of visualisation in design development

A considered evolution of a familiar form

A positive appeal decision for Laurence Associates

Laurence Associates at Stithians Show 2026

Certificates of Lawfulness Explained

Farm Diversification Opportunities in the Southwest

Planning Committee Success: Replacement Dwelling Approved

Every Project Has More Than One Story to Tell

Best of Houzz 2017 Design Award

Construction Excellence Southwest Cornwall Summer Boat Trip

Outline Approval for Three New Homes in St Keyne

Tom Evans Promoted to Junior Planner

Building for Growth

Rural Exception Scheme Approved in Perran Downs

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

Building Regulations Drawings: Why Detail Matters

Designing for Legacy, Lifestyle and Longevity

Regen Planning Conference

Functional Living in a Contemporary Cornish Home

Laurence Associates Featured in Salt Magazine

Laurence Associates to Attend Business Fest

Successful Appeal Secured on Caravan Use and Building Definition

Agricultural Barn Development Advice

Progress Update: Shaping a Bespoke Home

Appeal Success: Caravan Site Approved in Cornwall

Navigating Building Regulations in Cornwall: A Design Led Approach

Grand Designs

Understanding the Design Brief Service at Laurence Associates

Laurence Associates attending Kernow Construction Club

Property Development Forum

Planning Approved for 5 Unrestricted Rural Homes

Planning Permission Secured for Padstow Conservation Area Outbuildings

Self-Build and Custom Build Homes with Laurence Associates

Grade II Listed Farmstead Planning Success

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

International Women’s Day at Laurence Associates

Laurence Associates – Royal Cornwall Show 2024

Cornwall Building Regulations Update Event 2026

Laurence Associates Welcomes New Design Director

Meet the Laurence Associates Team at Devon County Show 2026

Why Do I Need a Professional Consultant’s Certificate?

Planning Consent Secured for Methane-Capture Facility

Securing Planning Permission – Community Hall Poundstock

Architecture Vogue – Smallridge Bros

Visit Laurence Associates at the Royal Cornwall Show 2026

Cornish Replacement Dwelling Submitted for Building Regulations

Laurence Associates at Business Fest South West Westpoint

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Should I use an Architect?

Celebrating 20 Years of Leadership – Richard Marsden

Visit Laurence Associates at the Royal Cornwall Show 2026

Barn Conversions Under Class Q and Class R

Laurence Associates – Royal Cornwall Show 2025

Rural Enterprise – Helping Rural Business Flourish

Cornwall Council Housing Requirement – Laurence Associates

Campsite Certificate and Replacement Dwelling Approval Cornwall

Feock replacement dwelling project overview

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Laurence Associates prepares for Royal Cornwall Show 2026

Committee Success Secures Permission in Principle for New Homes

Planning Approval Secured for Multi-Generational Home in Feock

Designing Homes Shaped by Landscape and Views in Rural Cornwall

A Tailored Approach to Conceptual Design

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Change of Use Approved: Takeaway to Residential in Cornwall

Seamless Single Storey Extensions That Complement Your Home

Designing for Approval or Designing to Build?

Grid Connection Reform and what it means for Renewable Energy Projects

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

Appeal Success Near St Ives

Barn Conversion Approved West Cornwall

Replacement Dwelling Approved Following Class Q Success

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

East Allington Permission in Principle success for five new homes

Current Vacancies – Senior Landscape Architect

Energy Statements: Why They Matter for Planning Applications