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

Planning Permission for Community Garden Redevelopment in Newquay

Barn Conversion Approved West Cornwall

Laurence Associates Welcomes New Planning Director

Seaside Sensation

Laurence Associates at Business Fest South West Westpoint

Vickery Holman Market Review

Replacement Dwellings – Pushing the boundaries of Architecture

Celebrating 20 Years of Leadership – Richard Marsden

Best of Houzz 2017 Design Award

Current Vacancies – Planner / Senior Planner

Eco development on the sand dunes at Hayle

Grand Designs

Business Cornwall – March 2026

Planning Permission Success for Barn Conversion

A Contemporary Coastal Home by Laurence Associates

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

BNG Exemption for Small Development Sites

Creating Flow and Connection Within the Home

Sensitive Dwelling Alterations Approved by Council

Current Vacancies – Town Planners

Waterside Lookout

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

Restronguet Point – a room with a view

Happy Easter from Laurence Associates

Replacement Dwelling in lieu of Class Q

Rural Enterprise – Helping Rural Business Flourish

Planning Appeals Changes from April 2026

Construction Excellence Southwest Summit 2026

Planning Permission Secured in Rock Cornwall

Laurence Associates Returning to the Royal Cornwall Show 2026

Housing Land Supply Changes: What They Mean for Planning

Laurence Associates to Attend Business Fest

James Vivian Promoted to Associate Director

Architecture Vogue – Higher Harlyn

Self-Build and Custom Build Homes with Laurence Associates

Permission in Principle Success in St Austell

Building for Growth

Planning Committee Reforms in England What You Need to Know

Coastal Home Design in Devon & Cornwall

How to Find a Building Plot

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Architecture Vogue – Enys Hill

Coastal Cornish Home Design | Contemporary Architecture

Rural Outbuilding Conversion Secures Planning Consent

A considered evolution of a familiar form

Housing Schemes in Cornwall That Truly Work for People

Creating Seamless Indoor Outdoor Living Spaces

Certificate of Lawfulness Secured for Residential Caravan Use

Appeal Success Near St Ives

Appeal Success: Caravan Site Approved in Cornwall

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

Securing Planning Permission – Greenbank Hotel Falmouth

Laurence Associates at Groundsure Women in Property

Town Planner Job Vacancy in Truro | Laurence Associates

Work Experience Week: Exploring Architecture and Structural Engineering

Laurence Associates prepares for Royal Cornwall Show 2026

Elmhurst Energy CPD

New Project Showcase | A New Collection of Laurence Associates Projects

Laurence Associates Attending Ashfords Business Breakfast

Master Planning That Creates Places for the Future

Planning Permission Success for Access, Parking & Facilities

Designing Homes Shaped by Landscape and Views in Rural Cornwall

A Guide to Our Planning Application Process

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

Planning Appeal Success for Permission in Principle Scheme

Designing for Approval or Designing to Build?

RIBA Safe & Healthy Environments CPD Completed

Architecture Vogue – Breakwater

Laurence Associates – Royal Cornwall Show 2024

Laurence Associates Expands with New Office in Exeter

Section 73 Approval for Revised Bungalow Scheme in St Erth

Appeal Success – Removing Occupancy Condition

Laurence Associates at Stithians Show 2026

Why Do a Self Build?

Why Do I Need a Professional Consultant’s Certificate?

Building Safety Act | Building Regulations Principal Designer

Laurence Associates Supports the Peloton Charity Golf Day 2026

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Non-Material Amendment Success

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Bespoke Architectural Design Process

Design and Placemaking PPG out now

Neighbourhood Plan Regulation Changes 2026

Feock replacement dwelling project overview

Building Towards a Greener Future: Our Earth Day Commitment

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

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Housing Land Supply Changes: What They Mean for Planning

Final Days at the Devon County Show for Laurence Associates

Penzance Business Breakfast

A positive appeal decision for Laurence Associates

Powering the Future: Repowering Wind Turbines Across the UK

Cape Cornwall Club Redevelopment | Laurence Associates

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

New premises & 30 Years in the business

Farm Diversification Opportunities in the Southwest

Construction (Design & Management) Regulations 2015 – March

Current Vacancies – Senior Landscape Architect

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

Planning Permission Secured for Coastal Home Extension in Cornwall

Four Dwellings Approved Following Outline Consent

Cornwall Local Plan Update 2028 and What It Means for Development

Planning Permission Secured for Padstow Conservation Area Outbuildings

Architecture Vogue – Humble Cottage

National Planning Policy Framework

Section 73 Planning Success for Self-Build in Cornwall | Laurence Associates

Sensitive Design Approach for Barn Conversion Window Proposal

Planning Approval Secured for Multi-Generational Home in Feock

Outline Planning Consent Secured for Two New Dwellings

Planning Approved for Farmhouse Extension on Bodmin Moor

Every Project Has More Than One Story to Tell

Laurence Associates Featured in Salt Magazine

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Visit Laurence Associates at the Devon County Show This Week

Inside A Coastal Cornwall Residential Project

Progress Update: Shaping a Bespoke Home

Padstow Conservation Area Extension Approved

Certificates of Lawfulness Explained

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

Designing for Legacy, Lifestyle and Longevity

Replacement Dwelling Approved Following Class Q Success

From Sketch to Reality: Architectural Visualisation

Should I use an Architect?

Change of Use Approved: Takeaway to Residential in Cornwall

Planning Approval for Sauna in Protected Landscape

Town Planner Vacancy – Planning Careers UK

Building for Growth

Visit Laurence Associates at the Royal Cornwall Show 2026

A Collaborative Approach to Creating Meaningful Spaces

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Conditional Planning Permission Secured for Five Homes in Bodmin

Architecture Vogue – Maen Valley

Property Development Forum

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Energy Consultancy Services at Laurence Associates

Planning Success in Tintagel

Where Design Meets Detail: The Role of Materials in Architecture

Laurence Associates at Kernow Construction Club

Home Renovation Progress Falmouth

Residential Project Site Update | Progress on Site

Architecture Vogue – Greenbank Hotel

Energy Statements: Why They Matter for Planning Applications

Architecture Vogue – Smallridge Bros

From sketch to reality the power of visualisation in design development

Laurence Associates – Royal Cornwall Show 2025

Housing Appeal Success in West Cornwall

Cornwall Council ‘Call For Sites’

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

Appeal Success for Agricultural Workers Dwelling Near Penzance

New Project Collection Coming Soon

Architecture Vogue – Sand Dunes

Campsite Certificate and Replacement Dwelling Approval Cornwall

Natural Light

Planning Approved for 5 Unrestricted Rural Homes

A Tailored Approach to Conceptual Design

Rural Exception Scheme Approved in Perran Downs

Unlocking Potential Through Replacement

Planning Permission Secured for Rural Replacement Dwelling

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

The Experts

Conversion in the Countryside: Securing Planning for a Rural Bothy

11 Bespoke Holiday Units Designed for Mawgan Porth

Current Progress on Site in Falmouth

International Women’s Day at Laurence Associates

Grade II Listed Farmstead Planning Success

Cornish Replacement Dwelling Submitted for Building Regulations

Community Sponsorship St Just RFC

Exploring Contemporary Materials and Colour in Cornish Architecture

Breaking Ground: New Project Progress

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Laurence Associates Attending Townsend Landowner Seminar

Tom Evans Promoted to Junior Planner

Three Successful Planning Applications on One Site

Redruth Housing Scheme Approved

Considering a Home Extension?

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

Committee Success Secures Permission in Principle for New Homes

Affordable Housing Success

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

Attending Women in Business Breakfast at Truro Golf Club

Understanding the Design Brief Service at Laurence Associates

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Construction Excellence Southwest Cornwall Summer Boat Trip

Ana Coelho promoted to Senior Chartered Architect

Seamless Single Storey Extensions That Complement Your Home

Laurence Associates to Exhibit at Devon County Show 2026

A Busy Week of Progress Across the Practice

Planning Appeal Success in Cornwall National Landscape

3D Modelling an image speaks a thousand words

Consent Secured for Amendments to Housing Scheme in Gweek

New National Planning Policy Framework Published | Laurence Associates

Why Part T Is Changing Commercial Design More Than You Think

Laurence Associates Attends Cornwall Council Planning Agents Forum

A First Look: Behind the Scenes of Our Latest Completed Project

What is the Community Infrastructure Levy?

Laurence Associates attending Kernow Construction Club

Laurence Associates Attending Stithians Show 2026

Planning Appeal Success to Building Regulations Approval

Summer in the City Networking Event | Laurence Associates Exeter

Visit Laurence Associates at the Royal Cornwall Show 2026

Porthcothan Site Update: Residential Planning Progress

Property Development Forum

Planning Consent Secured for Methane-Capture Facility

Team Attends Michelmore’s Property Development Club in Exeter

Barn Conversions Under Class Q and Class R

Navigating Building Regulations in Cornwall: A Design Led Approach

Construction Drawings Explained: What They Include and Why They Matter

Blending Architecture into the Devon Countryside Through Materiality

Planning Committee Success: Replacement Dwelling Approved

Principal Designer Services | CDM 2015 Compliance

Small Housing Schemes

Meet the Laurence Associates Team at Devon County Show 2026

Class Q Planning Permission

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

The Built Environment Network – Trevelver Farm

Planning consent secured for replacement wind turbine

Outline Approval for Three New Homes in St Keyne

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Securing Planning Permission – Community Hall Poundstock

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

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

Cornwall Council Housing Requirement – Laurence Associates

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Architecture Vogue – Eyebrid

Functional Living in a Contemporary Cornish Home

Laurence Associates at Stithians Show 2026

How to Finance a Self-Build

Planning Appeal Success for Equestrian Building

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Town Planner Job Vacancy in Truro | Laurence Associates

Grid Connection Reform and what it means for Renewable Energy Projects

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

CESW Summit 2026

Supporting the Interior Design Journey Through Architecture

Permission in Principle Secured for Six New Dwellings in Redruth

Building Regulations Drawings: Why Detail Matters

Securing Five Unrestricted Homes in Mawgan Porth

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

Architecture in Fowey | Laurence Associates

Laurence Associates at SLR Consulting’s Segway Olympics

Agricultural Barn Development Advice

Traditional Barn Conversion Approved | Building Regulations Success

Cornwall Building Regulations Update Event 2026

Laurence Associates Welcomes New Design Director

Laurence Associates at Groundsure Women in Property

Regen Planning Conference

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Successful Appeal Secured on Caravan Use and Building Definition

Design Appraisals UK | Site Feasibility and Planning Assessments

East Allington Permission in Principle success for five new homes