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

Appeal Success Near St Ives

Farm Diversification Opportunities in the Southwest

Rural Exception Scheme Approved in Perran Downs

Change of Use Approved: Takeaway to Residential in Cornwall

A Collaborative Approach to Creating Meaningful Spaces

Cornwall Building Regulations Update Event 2026

Planning Approved for Farmhouse Extension on Bodmin Moor

Architecture Vogue – Greenbank Hotel

Summer in the City Networking Event | Laurence Associates Exeter

Section 73 Approval for Revised Bungalow Scheme in St Erth

Breaking Ground: New Project Progress

Planning Approved for 5 Unrestricted Rural Homes

Laurence Associates Featured in Salt Magazine

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Master Planning That Creates Places for the Future

Small Housing Schemes

Elmhurst Energy CPD

Seaside Sensation

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Visit Laurence Associates at the Devon County Show This Week

Why Do a Self Build?

Committee Success Secures Permission in Principle for New Homes

Agricultural Barn Development Advice

Creating Flow and Connection Within the Home

Laurence Associates Welcomes New Design Director

Regen Planning Conference

Laurence Associates Expands with New Office in Exeter

Cornwall Council ‘Call For Sites’

Certificates of Lawfulness Explained

From sketch to reality the power of visualisation in design development

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Should I use an Architect?

Construction Excellence Southwest Summit 2026

Housing Appeal Success in West Cornwall

Property Development Forum

Appeal Success for Agricultural Workers Dwelling Near Penzance

Laurence Associates at Business Fest South West Westpoint

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

Class Q Planning Permission

Considering a Home Extension?

Inside A Coastal Cornwall Residential Project

National Planning Policy Framework

Architecture Vogue – Humble Cottage

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Feock replacement dwelling project overview

Cornwall Council Housing Requirement – Laurence Associates

Designing Homes Shaped by Landscape and Views in Rural Cornwall

Planning Consent Secured for Methane-Capture Facility

Self-Build and Custom Build Homes with Laurence Associates

Laurence Associates attending Kernow Construction Club

Laurence Associates at Stithians Show 2026

Penzance Business Breakfast

Celebrating 20 Years of Leadership – Richard Marsden

Planning Appeal Success for Equestrian Building

Meet the Laurence Associates Team at Devon County Show 2026

3D Modelling an image speaks a thousand words

Team Attends Michelmore’s Property Development Club in Exeter

How to Find a Building Plot

Home Renovation Progress Falmouth

Campsite Certificate and Replacement Dwelling Approval Cornwall

Padstow Conservation Area Extension Approved

Final Days at the Devon County Show for Laurence Associates

Planning Permission Secured for Padstow Conservation Area Outbuildings

Eco development on the sand dunes at Hayle

New Project Showcase | A New Collection of Laurence Associates Projects

Replacement Dwellings – Pushing the boundaries of Architecture

Building Safety Act | Building Regulations Principal Designer

Laurence Associates Supports the Peloton Charity Golf Day 2026

Laurence Associates Attends Cornwall Council Planning Agents Forum

Planning Within Cornwall’s World Heritage Site | What You Need to Know

Where Design Meets Detail: The Role of Materials in Architecture

Town Planner Vacancy – Planning Careers UK

Porthcothan Site Update: Residential Planning Progress

Neighbourhood Plan Regulation Changes 2026

Sensitive Dwelling Alterations Approved by Council

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Replacement Dwelling Approved Following Class Q Success

Architecture Vogue – Maen Valley

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

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

A positive appeal decision for Laurence Associates

Building for Growth

Laurence Associates at Stithians Show 2026

East Allington Permission in Principle success for five new homes

The Experts

Planning consent secured for replacement wind turbine

Current Vacancies – Planner / Senior Planner

Cornish Replacement Dwelling Submitted for Building Regulations

Energy Consultancy Services at Laurence Associates

Building Regulations Drawings: Why Detail Matters

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

A Busy Week of Progress Across the Practice

Bespoke Architectural Design Process

International Women’s Day at Laurence Associates

Non-Material Amendment Success

Building for Growth

Architecture Vogue – Smallridge Bros

Business Cornwall – March 2026

Understanding the Design Brief Service at Laurence Associates

Seamless Single Storey Extensions That Complement Your Home

Laurence Associates Welcomes New Planning Director

Securing Planning Permission – Community Hall Poundstock

Principal Designer Services | CDM 2015 Compliance

Coastal Home Design in Devon & Cornwall

Laurence Associates Returning to the Royal Cornwall Show 2026

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

Community Sponsorship St Just RFC

Housing Schemes in Cornwall That Truly Work for People

Housing Land Supply Changes: What They Mean for Planning

Restronguet Point – a room with a view

Unlocking Potential Through Replacement

Laurence Associates prepares for Royal Cornwall Show 2026

Powering the Future: Repowering Wind Turbines Across the UK

Architecture Vogue – Enys Hill

Visit Laurence Associates at the Royal Cornwall Show 2026

Planning Committee Reforms in England What You Need to Know

Barn Conversion Approved West Cornwall

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

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Housing Land Supply Changes: What They Mean for Planning

From Sketch to Reality: Architectural Visualisation

Planning Permission Secured in Rock Cornwall

Coastal Cornish Home Design | Contemporary Architecture

Attending Women in Business Breakfast at Truro Golf Club

Current Vacancies – Town Planners

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

Outline Approval for Three New Homes in St Keyne

Why Do I Need a Professional Consultant’s Certificate?

Supporting the Interior Design Journey Through Architecture

A Tailored Approach to Conceptual Design

Planning Committee Success: Replacement Dwelling Approved

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Laurence Associates Attending Townsend Landowner Seminar

Appeal Success – Removing Occupancy Condition

Consent Secured for Amendments to Housing Scheme in Gweek

What is the Community Infrastructure Levy?

Ana Coelho promoted to Senior Chartered Architect

Conversion in the Countryside: Securing Planning for a Rural Bothy

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

A Guide to Our Planning Application Process

Navigating Building Regulations in Cornwall: A Design Led Approach

Building Towards a Greener Future: Our Earth Day Commitment

Laurence Associates Attending Stithians Show 2026

Planning Appeal Success for Permission in Principle Scheme

Every Project Has More Than One Story to Tell

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

Construction Excellence Southwest Cornwall Summer Boat Trip

Architecture Vogue – Eyebrid

Laurence Associates – Royal Cornwall Show 2025

Current Vacancies – Senior Landscape Architect

Why Part T Is Changing Commercial Design More Than You Think

Replacement Dwelling in lieu of Class Q

Property Development Forum

Architecture Vogue – Sand Dunes

Outline Planning Consent Secured for Two New Dwellings

Cape Cornwall Club Redevelopment | Laurence Associates

Planning Approval for Sauna in Protected Landscape

New premises & 30 Years in the business

Planning Approval Secured for Multi-Generational Home in Feock

Vickery Holman Market Review

A considered evolution of a familiar form

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Residential Project Site Update | Progress on Site

Planning Permission Success for Barn Conversion

Conditional Planning Permission Secured for Five Homes in Bodmin

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Current Progress on Site in Falmouth

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Architecture Vogue – Higher Harlyn

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Laurence Associates – Royal Cornwall Show 2024

Grid Connection Reform and what it means for Renewable Energy Projects

James Vivian Promoted to Associate Director

Cornwall Local Plan Update 2028 and What It Means for Development

Four Dwellings Approved Following Outline Consent

RIBA Safe & Healthy Environments CPD Completed

Barn Conversions Under Class Q and Class R

Redruth Housing Scheme Approved

Energy Statements: Why They Matter for Planning Applications

Rural Outbuilding Conversion Secures Planning Consent

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Designing for Approval or Designing to Build?

Laurence Associates to Exhibit at Devon County Show 2026

Progress Update: Shaping a Bespoke Home

Tom Evans Promoted to Junior Planner

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

Planning Appeal Success in Cornwall National Landscape

Planning Permission for Community Garden Redevelopment in Newquay

Grade II Listed Farmstead Planning Success

CESW Summit 2026

Functional Living in a Contemporary Cornish Home

Creating Seamless Indoor Outdoor Living Spaces

Happy Easter from Laurence Associates

How to Finance a Self-Build

Laurence Associates at Kernow Construction Club

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Construction (Design & Management) Regulations 2015 – March

Planning Appeal Success to Building Regulations Approval

Exploring Contemporary Materials and Colour in Cornish Architecture

Traditional Barn Conversion Approved | Building Regulations Success

Planning Appeals Changes from April 2026

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

Work Experience Week: Exploring Architecture and Structural Engineering

Rural Enterprise – Helping Rural Business Flourish

Planning Permission Success for Access, Parking & Facilities

Securing Planning Permission – Greenbank Hotel Falmouth

Grand Designs

Permission in Principle Success in St Austell

Appeal Success: Caravan Site Approved in Cornwall

Laurence Associates to Attend Business Fest

Design and Placemaking PPG out now

BNG Exemption for Small Development Sites

Visit Laurence Associates at the Royal Cornwall Show 2026

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

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

Affordable Housing Success

Best of Houzz 2017 Design Award

Town Planner Job Vacancy in Truro | Laurence Associates

Design Appraisals UK | Site Feasibility and Planning Assessments

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Successful Appeal Secured on Caravan Use and Building Definition

Natural Light

Architecture in Fowey | Laurence Associates

Planning Success in Tintagel

Securing Five Unrestricted Homes in Mawgan Porth

Designing for Legacy, Lifestyle and Longevity

Laurence Associates Attending Ashfords Business Breakfast

Waterside Lookout