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

Home Renovation Progress Falmouth

Securing Five Unrestricted Homes in Mawgan Porth

Powering the Future: Repowering Wind Turbines Across the UK

Coastal Home Design in Devon & Cornwall

RIBA Safe & Healthy Environments CPD Completed

Campsite Certificate and Replacement Dwelling Approval Cornwall

Celebrating 20 Years of Leadership – Richard Marsden

A Tailored Approach to Conceptual Design

Porthcothan Site Update: Residential Planning Progress

Current Vacancies – Planner / Senior Planner

Small Housing Schemes

Regen Planning Conference

Appeal Success: Caravan Site Approved in Cornwall

Bespoke Architectural Design Process

Current Vacancies – Town Planners

Planning Appeal Success for Permission in Principle Scheme

International Women’s Day at Laurence Associates

Planning Permission Secured in Rock Cornwall

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

How to Find a Building Plot

Appeal Success – Removing Occupancy Condition

Change of Use Approved: Takeaway to Residential in Cornwall

Feock replacement dwelling project overview

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Cornwall Local Plan Update 2028 and What It Means for Development

Why Do a Self Build?

Where Design Meets Detail: The Role of Materials in Architecture

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Designing for Legacy, Lifestyle and Longevity

Design Appraisals UK | Site Feasibility and Planning Assessments

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Appeal Success for Agricultural Workers Dwelling Near Penzance

Why Do I Need a Professional Consultant’s Certificate?

Outline Approval for Three New Homes in St Keyne

Ana Coelho promoted to Senior Chartered Architect

A Busy Week of Progress Across the Practice

A positive appeal decision for Laurence Associates

Certificates of Lawfulness Explained

The Experts

Waterside Lookout

Seaside Sensation

Four Dwellings Approved Following Outline Consent

Unlocking Potential Through Replacement

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Happy Easter from Laurence Associates

Laurence Associates to Exhibit at Devon County Show 2026

Town Planner Vacancy – Planning Careers UK

Replacement Dwellings – Pushing the boundaries of Architecture

James Vivian Promoted to Associate Director

Meet the Laurence Associates Team at Devon County Show 2026

Laurence Associates – Royal Cornwall Show 2024

Visit Laurence Associates at the Royal Cornwall Show 2026

Architecture Vogue – Enys Hill

A Guide to Our Planning Application Process

Construction (Design & Management) Regulations 2015 – March

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

3D Modelling an image speaks a thousand words

Replacement Dwelling in lieu of Class Q

Final Days at the Devon County Show for Laurence Associates

Laurence Associates prepares for Royal Cornwall Show 2026

Architecture Vogue – Higher Harlyn

Best of Houzz 2017 Design Award

From sketch to reality the power of visualisation in design development

Architecture Vogue – Greenbank Hotel

Cornwall Building Regulations Update Event 2026

Planning Approval Secured for Multi-Generational Home in Feock

Community Sponsorship St Just RFC

Progress Update: Shaping a Bespoke Home

Town Planner Job Vacancy in Truro | Laurence Associates

Section 73 Approval for Revised Bungalow Scheme in St Erth

Considering a Home Extension?

Construction Excellence Southwest Summit 2026

Successful Appeal Secured on Caravan Use and Building Definition

Seamless Single Storey Extensions That Complement Your Home

A considered evolution of a familiar form

Replacement Dwelling Approved Following Class Q Success

Laurence Associates Returning to the Royal Cornwall Show 2026

Planning Permission Success for Barn Conversion

Energy Consultancy Services at Laurence Associates

Self-Build and Custom Build Homes with Laurence Associates

Class Q Planning Permission

Laurence Associates Attending Townsend Landowner Seminar

Laurence Associates Attends Cornwall Council Planning Agents Forum

Navigating Building Regulations in Cornwall: A Design Led Approach

Laurence Associates Welcomes New Design Director

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Functional Living in a Contemporary Cornish Home

Tom Evans Promoted to Junior Planner

Architecture Vogue – Eyebrid

Design and Placemaking PPG out now

Current Vacancies – Senior Landscape Architect

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

Building for Growth

Visit Laurence Associates at the Royal Cornwall Show 2026

Outline Planning Consent Secured for Two New Dwellings

Cornish Replacement Dwelling Submitted for Building Regulations

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

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Attending Women in Business Breakfast at Truro Golf Club

Laurence Associates Welcomes New Planning Director

Committee Success Secures Permission in Principle for New Homes

Should I use an Architect?

Non-Material Amendment Success

Property Development Forum

Laurence Associates Expands with New Office in Exeter

Laurence Associates at Business Fest South West Westpoint

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

Planning Permission for Community Garden Redevelopment in Newquay

Every Project Has More Than One Story to Tell

Architecture Vogue – Smallridge Bros

Planning Success in Tintagel

Penzance Business Breakfast

Neighbourhood Plan Regulation Changes 2026

Planning Appeal Success in Cornwall National Landscape

Cape Cornwall Club Redevelopment | Laurence Associates

Current Progress on Site in Falmouth

Natural Light

Master Planning That Creates Places for the Future

Designing for Approval or Designing to Build?

Sensitive Dwelling Alterations Approved by Council

Affordable Housing Success

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Rural Enterprise – Helping Rural Business Flourish

Farm Diversification Opportunities in the Southwest

Laurence Associates to Attend Business Fest

Building Regulations Drawings: Why Detail Matters

Planning Approved for Farmhouse Extension on Bodmin Moor

Conversion in the Countryside: Securing Planning for a Rural Bothy

Building for Growth

Creating Flow and Connection Within the Home

Planning Appeals Changes from April 2026

Barn Conversions Under Class Q and Class R

Agricultural Barn Development Advice

Cornwall Council ‘Call For Sites’

Architecture Vogue – Sand Dunes

Cornwall Council Housing Requirement – Laurence Associates

Housing Schemes in Cornwall That Truly Work for People

Grand Designs

Eco development on the sand dunes at Hayle

Planning Consent Secured for Methane-Capture Facility

Laurence Associates – Royal Cornwall Show 2025

Business Cornwall – March 2026

Planning Permission Secured for Padstow Conservation Area Outbuildings

Breaking Ground: New Project Progress

Planning Committee Success: Replacement Dwelling Approved

A Collaborative Approach to Creating Meaningful Spaces

Planning Permission Success for Access, Parking & Facilities

Rural Outbuilding Conversion Secures Planning Consent

Why Part T Is Changing Commercial Design More Than You Think

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

Understanding the Design Brief Service at Laurence Associates

Laurence Associates Attending Ashfords Business Breakfast

Team Attends Michelmore’s Property Development Club in Exeter

Securing Planning Permission – Community Hall Poundstock

New premises & 30 Years in the business

Permission in Principle Success in St Austell

Appeal Success Near St Ives

Barn Conversion Approved West Cornwall

CESW Summit 2026

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

Planning Approval for Sauna in Protected Landscape

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

Restronguet Point – a room with a view

Grid Connection Reform and what it means for Renewable Energy Projects

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Laurence Associates at Kernow Construction Club

Laurence Associates attending Kernow Construction Club

Vickery Holman Market Review

National Planning Policy Framework

Building Towards a Greener Future: Our Earth Day Commitment

Grade II Listed Farmstead Planning Success

Elmhurst Energy CPD

What is the Community Infrastructure Levy?

Property Development Forum

How to Finance a Self-Build

Architecture Vogue – Maen Valley

Planning Approved for 5 Unrestricted Rural Homes

Visit Laurence Associates at the Devon County Show This Week

Supporting the Interior Design Journey Through Architecture

Securing Planning Permission – Greenbank Hotel Falmouth

Housing Appeal Success in West Cornwall

Rural Exception Scheme Approved in Perran Downs