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 Supports the Peloton Charity Golf Day 2026

Architecture Vogue – Eyebrid

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Town Planner Vacancy – Planning Careers UK

Planning Committee Reforms in England What You Need to Know

Team Attends Michelmore’s Property Development Club in Exeter

Laurence Associates to Exhibit at Devon County Show 2026

Master Planning That Creates Places for the Future

Planning Appeal Success to Building Regulations Approval

Laurence Associates Attending Ashfords Business Breakfast

Design and Placemaking PPG out now

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

Laurence Associates Expands with New Office in Exeter

Laurence Associates at Business Fest South West Westpoint

Community Sponsorship St Just RFC

Sensitive Dwelling Alterations Approved by Council

Porthcothan Site Update: Residential Planning Progress

Rural Enterprise – Helping Rural Business Flourish

Small Housing Schemes

How to Find a Building Plot

Waterside Lookout

Tom Evans Promoted to Junior Planner

Grid Connection Reform and what it means for Renewable Energy Projects

Visit Laurence Associates at the Royal Cornwall Show 2026

Unlocking Potential Through Replacement

3D Modelling an image speaks a thousand words

Self-Build and Custom Build Homes with Laurence Associates

Laurence Associates Returning to the Royal Cornwall Show 2026

Securing Planning Permission – Greenbank Hotel Falmouth

Why Part T Is Changing Commercial Design More Than You Think

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

Replacement Dwelling Approved Following Class Q Success

Cornwall Council Housing Requirement – Laurence Associates

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

Laurence Associates prepares for Royal Cornwall Show 2026

Building for Growth

Appeal Success – Removing Occupancy Condition

Functional Living in a Contemporary Cornish Home

Work Experience Week: Exploring Architecture and Structural Engineering

Housing Schemes in Cornwall That Truly Work for People

Current Progress on Site in Falmouth

Property Development Forum

Class Q Planning Permission

A Tailored Approach to Conceptual Design

A Collaborative Approach to Creating Meaningful Spaces

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Best of Houzz 2017 Design Award

Laurence Associates Featured in Salt Magazine

Planning Approved for Farmhouse Extension on Bodmin Moor

Cape Cornwall Club Redevelopment | Laurence Associates

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

RIBA Safe & Healthy Environments CPD Completed

Laurence Associates Attending Townsend Landowner Seminar

Why Do a Self Build?

Affordable Housing Success

A Guide to Our Planning Application Process

Laurence Associates Welcomes New Design Director

Celebrating 20 Years of Leadership – Richard Marsden

Considering a Home Extension?

Designing Homes Shaped by Landscape and Views in Rural Cornwall

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

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

Planning Permission Secured in Rock Cornwall

Creating Flow and Connection Within the Home

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Understanding the Design Brief Service at Laurence Associates

Architecture Vogue – Sand Dunes

Barn Conversions Under Class Q and Class R

Energy Consultancy Services at Laurence Associates

Regen Planning Conference

Permission in Principle Success in St Austell

Penzance Business Breakfast

Appeal Success for Agricultural Workers Dwelling Near Penzance

Grade II Listed Farmstead Planning Success

Energy Statements: Why They Matter for Planning Applications

Supporting the Interior Design Journey Through Architecture

Town Planner Job Vacancy in Truro | Laurence Associates

Neighbourhood Plan Regulation Changes 2026

Laurence Associates to Attend Business Fest

Where Design Meets Detail: The Role of Materials in Architecture

Laurence Associates at Kernow Construction Club

Property Development Forum

Replacement Dwelling in lieu of Class Q

Outline Planning Consent Secured for Two New Dwellings

Planning Appeal Success for Equestrian Building

The Experts

Planning Permission Success for Barn Conversion

Bespoke Architectural Design Process

Powering the Future: Repowering Wind Turbines Across the UK

Laurence Associates Welcomes New Planning Director

Section 73 Approval for Revised Bungalow Scheme in St Erth

Non-Material Amendment Success

A positive appeal decision for Laurence Associates

Should I use an Architect?

Design Appraisals UK | Site Feasibility and Planning Assessments

Housing Appeal Success in West Cornwall

Traditional Barn Conversion Approved | Building Regulations Success

Planning Permission Success for Access, Parking & Facilities

Elmhurst Energy CPD

Cornwall Building Regulations Update Event 2026

Construction Excellence Southwest Summit 2026

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Securing Five Unrestricted Homes in Mawgan Porth

A Busy Week of Progress Across the Practice

Cornwall Local Plan Update 2028 and What It Means for Development

Eco development on the sand dunes at Hayle

Laurence Associates – Royal Cornwall Show 2024

What is the Community Infrastructure Levy?

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

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

Barn Conversion Approved West Cornwall

Building Towards a Greener Future: Our Earth Day Commitment

Construction (Design & Management) Regulations 2015 – March

Campsite Certificate and Replacement Dwelling Approval Cornwall

Committee Success Secures Permission in Principle for New Homes

Cornwall Council ‘Call For Sites’

From sketch to reality the power of visualisation in design development

Every Project Has More Than One Story to Tell

Architecture Vogue – Humble Cottage

Outline Approval for Three New Homes in St Keyne

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Visit Laurence Associates at the Devon County Show This Week

Architecture Vogue – Higher Harlyn

Planning Success in Tintagel

Coastal Home Design in Devon & Cornwall

Laurence Associates Attending Stithians Show 2026

Visit Laurence Associates at the Royal Cornwall Show 2026

Ana Coelho promoted to Senior Chartered Architect

Agricultural Barn Development Advice

Building Regulations Drawings: Why Detail Matters

Replacement Dwellings – Pushing the boundaries of Architecture

Navigating Building Regulations in Cornwall: A Design Led Approach

Feock replacement dwelling project overview

Appeal Success Near St Ives

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

Planning Appeal Success for Permission in Principle Scheme

Grand Designs

Appeal Success: Caravan Site Approved in Cornwall

Business Cornwall – March 2026

Progress Update: Shaping a Bespoke Home

Redruth Housing Scheme Approved

National Planning Policy Framework

Natural Light

Final Days at the Devon County Show for Laurence Associates

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

Architecture Vogue – Smallridge Bros

Breaking Ground: New Project Progress

Securing Planning Permission – Community Hall Poundstock

Conversion in the Countryside: Securing Planning for a Rural Bothy

New premises & 30 Years in the business

Laurence Associates Attends Cornwall Council Planning Agents Forum

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Rural Outbuilding Conversion Secures Planning Consent

Architecture Vogue – Enys Hill

Planning Appeals Changes from April 2026

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Farm Diversification Opportunities in the Southwest

Planning Approval Secured for Multi-Generational Home in Feock

Four Dwellings Approved Following Outline Consent

Planning Permission Secured for Padstow Conservation Area Outbuildings

Architecture Vogue – Greenbank Hotel

Planning Consent Secured for Methane-Capture Facility

Planning Committee Success: Replacement Dwelling Approved

Cornish Replacement Dwelling Submitted for Building Regulations

Seaside Sensation

Designing for Approval or Designing to Build?

CESW Summit 2026

Planning Permission for Community Garden Redevelopment in Newquay

Coastal Cornish Home Design | Contemporary Architecture

Certificates of Lawfulness Explained

A considered evolution of a familiar form

Meet the Laurence Associates Team at Devon County Show 2026

Vickery Holman Market Review

Happy Easter from Laurence Associates

Planning Appeal Success in Cornwall National Landscape

Laurence Associates attending Kernow Construction Club

Current Vacancies – Town Planners

Restronguet Point – a room with a view

How to Finance a Self-Build

James Vivian Promoted to Associate Director

Planning Approved for 5 Unrestricted Rural Homes

Change of Use Approved: Takeaway to Residential in Cornwall

Laurence Associates – Royal Cornwall Show 2025

Planning Approval for Sauna in Protected Landscape

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Current Vacancies – Senior Landscape Architect

Building for Growth

Rural Exception Scheme Approved in Perran Downs

Home Renovation Progress Falmouth

Designing for Legacy, Lifestyle and Longevity

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Attending Women in Business Breakfast at Truro Golf Club

Why Do I Need a Professional Consultant’s Certificate?

International Women’s Day at Laurence Associates

Seamless Single Storey Extensions That Complement Your Home

Successful Appeal Secured on Caravan Use and Building Definition

Architecture Vogue – Maen Valley

Current Vacancies – Planner / Senior Planner