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

Unlocking Potential Through Replacement

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Business Cornwall – March 2026

Laurence Associates Attends Cornwall Council Planning Agents Forum

Penzance Business Breakfast

Meet the Laurence Associates Team at Devon County Show 2026

Building Safety Act | Building Regulations Principal Designer

Securing Planning Permission – Community Hall Poundstock

A positive appeal decision for Laurence Associates

Current Vacancies – Planner / Senior Planner

Rural Enterprise – Helping Rural Business Flourish

Cape Cornwall Club Redevelopment | Laurence Associates

Exploring Contemporary Materials and Colour in Cornish Architecture

Architecture Vogue – Eyebrid

CESW Summit 2026

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

Building for Growth

Housing Land Supply Changes: What They Mean for Planning

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Home Renovation Progress Falmouth

Seaside Sensation

Planning Permission for Community Garden Redevelopment in Newquay

New Project Collection Coming Soon

Planning Appeal Success for Permission in Principle Scheme

Building for Growth

Town Planner Vacancy – Planning Careers UK

Why Do I Need a Professional Consultant’s Certificate?

Conversion in the Countryside: Securing Planning for a Rural Bothy

Vickery Holman Market Review

The Experts

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

Architecture in Fowey | Laurence Associates

Attending Women in Business Breakfast at Truro Golf Club

Appeal Success Near St Ives

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Architecture Vogue – Enys Hill

Laurence Associates Attending Stithians Show 2026

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

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

Planning Approved for 5 Unrestricted Rural Homes

Laurence Associates Featured in Salt Magazine

Powering the Future: Repowering Wind Turbines Across the UK

New Project Showcase | A New Collection of Laurence Associates Projects

Laurence Associates to Exhibit at Devon County Show 2026

Coastal Home Design in Devon & Cornwall

Appeal Success – Removing Occupancy Condition

Cornwall Building Regulations Update Event 2026

Planning Consent Secured for Methane-Capture Facility

Planning Permission Secured for Padstow Conservation Area Outbuildings

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

From Sketch to Reality: Architectural Visualisation

Planning Approved for Farmhouse Extension on Bodmin Moor

Small Housing Schemes

Cornwall Local Plan Update 2028 and What It Means for Development

Appeal Success: Caravan Site Approved in Cornwall

BNG Exemption for Small Development Sites

Inside A Coastal Cornwall Residential Project

Planning consent secured for replacement wind turbine

National Planning Policy Framework

Waterside Lookout

Laurence Associates to Attend Business Fest

Should I use an Architect?

Successful Appeal Secured on Caravan Use and Building Definition

Residential Project Site Update | Progress on Site

Principal Designer Services | CDM 2015 Compliance

Laurence Associates attending Kernow Construction Club

Natural Light

Agricultural Barn Development Advice

Replacement Dwelling in lieu of Class Q

Regen Planning Conference

Design and Placemaking PPG out now

Class Q Planning Permission

Visit Laurence Associates at the Royal Cornwall Show 2026

Elmhurst Energy CPD

Tom Evans Promoted to Junior Planner

Considering a Home Extension?

Master Planning That Creates Places for the Future

Ana Coelho promoted to Senior Chartered Architect

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

Planning Approval Secured for Multi-Generational Home in Feock

Laurence Associates Returning to the Royal Cornwall Show 2026

Section 73 Approval for Revised Bungalow Scheme in St Erth

Housing Appeal Success in West Cornwall

Four Dwellings Approved Following Outline Consent

Laurence Associates Welcomes New Planning Director

Construction Excellence Southwest Summit 2026

Affordable Housing Success

East Allington Permission in Principle success for five new homes

Traditional Barn Conversion Approved | Building Regulations Success

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Laurence Associates Supports the Peloton Charity Golf Day 2026

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

Current Vacancies – Senior Landscape Architect

Outline Approval for Three New Homes in St Keyne

Appeal Success for Agricultural Workers Dwelling Near Penzance

International Women’s Day at Laurence Associates

Property Development Forum

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

Town Planner Job Vacancy in Truro | Laurence Associates

Bespoke Architectural Design Process

Community Sponsorship St Just RFC

Feock replacement dwelling project overview

Neighbourhood Plan Regulation Changes 2026

Eco development on the sand dunes at Hayle

Cornwall Council ‘Call For Sites’

Rural Outbuilding Conversion Secures Planning Consent

Design Appraisals UK | Site Feasibility and Planning Assessments

How to Find a Building Plot

Grand Designs

Planning Appeal Success in Cornwall National Landscape

Architecture Vogue – Higher Harlyn

Supporting the Interior Design Journey Through Architecture

A Busy Week of Progress Across the Practice

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

Conditional Planning Permission Secured for Five Homes in Bodmin

Planning Appeal Success for Equestrian Building

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Progress Update: Shaping a Bespoke Home

Navigating Building Regulations in Cornwall: A Design Led Approach

Understanding the Design Brief Service at Laurence Associates

Best of Houzz 2017 Design Award

3D Modelling an image speaks a thousand words

Housing Schemes in Cornwall That Truly Work for People

James Vivian Promoted to Associate Director

New National Planning Policy Framework Published | Laurence Associates

Laurence Associates Welcomes New Design Director

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Laurence Associates Attending Ashfords Business Breakfast

Laurence Associates at Kernow Construction Club

Current Vacancies – Town Planners

Farm Diversification Opportunities in the Southwest

Team Attends Michelmore’s Property Development Club in Exeter

Laurence Associates prepares for Royal Cornwall Show 2026

Porthcothan Site Update: Residential Planning Progress

Barn Conversions Under Class Q and Class R

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

Replacement Dwelling Approved Following Class Q Success

Sensitive Dwelling Alterations Approved by Council

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Creating Flow and Connection Within the Home

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

Cornwall Council Housing Requirement – Laurence Associates

Coastal Cornish Home Design | Contemporary Architecture

Planning Appeal Success to Building Regulations Approval

Building Towards a Greener Future: Our Earth Day Commitment

Architecture Vogue – Maen Valley

Grid Connection Reform and what it means for Renewable Energy Projects

A Tailored Approach to Conceptual Design

Securing Five Unrestricted Homes in Mawgan Porth

Laurence Associates at Stithians Show 2026

Planning Permission Success for Access, Parking & Facilities

Change of Use Approved: Takeaway to Residential in Cornwall

Campsite Certificate and Replacement Dwelling Approval Cornwall

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Planning Approval for Sauna in Protected Landscape

Consent Secured for Amendments to Housing Scheme in Gweek

Sensitive Design Approach for Barn Conversion Window Proposal

A Guide to Our Planning Application Process

Architecture Vogue – Humble Cottage

Non-Material Amendment Success

Where Design Meets Detail: The Role of Materials in Architecture

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Restronguet Point – a room with a view

Housing Land Supply Changes: What They Mean for Planning

Planning Appeals Changes from April 2026

Functional Living in a Contemporary Cornish Home

Padstow Conservation Area Extension Approved

Grade II Listed Farmstead Planning Success

Why Part T Is Changing Commercial Design More Than You Think

Creating Seamless Indoor Outdoor Living Spaces

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Breaking Ground: New Project Progress

A considered evolution of a familiar form

Current Progress on Site in Falmouth

Permission in Principle Success in St Austell

Architecture Vogue – Greenbank Hotel

Securing Planning Permission – Greenbank Hotel Falmouth

From sketch to reality the power of visualisation in design development

Planning Permission Secured in Rock Cornwall

Laurence Associates at Stithians Show 2026

Property Development Forum

Celebrating 20 Years of Leadership – Richard Marsden

Seamless Single Storey Extensions That Complement Your Home

Certificates of Lawfulness Explained

Self-Build and Custom Build Homes with Laurence Associates

Designing for Approval or Designing to Build?

Outline Planning Consent Secured for Two New Dwellings

RIBA Safe & Healthy Environments CPD Completed

Committee Success Secures Permission in Principle for New Homes

Why Do a Self Build?

Rural Exception Scheme Approved in Perran Downs

Barn Conversion Approved West Cornwall

Work Experience Week: Exploring Architecture and Structural Engineering

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Planning Permission Success for Barn Conversion

Laurence Associates Expands with New Office in Exeter

Summer in the City Networking Event | Laurence Associates Exeter

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

Visit Laurence Associates at the Royal Cornwall Show 2026

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

A Collaborative Approach to Creating Meaningful Spaces

Laurence Associates at Business Fest South West Westpoint

Laurence Associates – Royal Cornwall Show 2025

Designing for Legacy, Lifestyle and Longevity

Every Project Has More Than One Story to Tell

Cornish Replacement Dwelling Submitted for Building Regulations

11 Bespoke Holiday Units Designed for Mawgan Porth

Laurence Associates Attending Townsend Landowner Seminar

Construction Excellence Southwest Cornwall Summer Boat Trip

How to Finance a Self-Build

Final Days at the Devon County Show for Laurence Associates

Energy Statements: Why They Matter for Planning Applications

Building Regulations Drawings: Why Detail Matters

Construction Drawings Explained: What They Include and Why They Matter

What is the Community Infrastructure Levy?

Energy Consultancy Services at Laurence Associates

Happy Easter from Laurence Associates

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

New premises & 30 Years in the business

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Replacement Dwellings – Pushing the boundaries of Architecture

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

Planning Committee Reforms in England What You Need to Know

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Architecture Vogue – Sand Dunes

Planning Success in Tintagel

Laurence Associates at Groundsure Women in Property

Laurence Associates – Royal Cornwall Show 2024

Planning Committee Success: Replacement Dwelling Approved

Redruth Housing Scheme Approved

Visit Laurence Associates at the Devon County Show This Week

Designing Homes Shaped by Landscape and Views in Rural Cornwall

Architecture Vogue – Smallridge Bros

Construction (Design & Management) Regulations 2015 – March