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

Best of Houzz 2017 Design Award

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Affordable Housing Success

Natural Light

A Tailored Approach to Conceptual Design

Planning Permission Secured for Padstow Conservation Area Outbuildings

Laurence Associates Featured in Salt Magazine

Home Renovation Progress Falmouth

Navigating Building Regulations in Cornwall: A Design Led Approach

Rural Exception Scheme Approved in Perran Downs

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

Visit Laurence Associates at the Royal Cornwall Show 2026

Seaside Sensation

Current Vacancies – Town Planners

New Project Collection Coming Soon

Designing Homes Shaped by Landscape and Views in Rural Cornwall

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Architecture Vogue – Higher Harlyn

Laurence Associates Expands with New Office in Exeter

Attending Women in Business Breakfast at Truro Golf Club

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

Architecture Vogue – Sand Dunes

Permission in Principle Success in St Austell

Self-Build and Custom Build Homes with Laurence Associates

Architecture Vogue – Breakwater

Non-Material Amendment Success

Property Development Forum

Construction (Design & Management) Regulations 2015 – March

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Permission in Principle Secured for Six New Dwellings in Redruth

Waterside Lookout

Class Q Planning Permission

Rural Enterprise – Helping Rural Business Flourish

Planning Appeals Changes from April 2026

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

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

Progress Update: Shaping a Bespoke Home

Bespoke Architectural Design Process

Energy Consultancy Services at Laurence Associates

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Conversion in the Countryside: Securing Planning for a Rural Bothy

Housing Appeal Success in West Cornwall

Exploring Contemporary Materials and Colour in Cornish Architecture

A Guide to Our Planning Application Process

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Laurence Associates at SLR Consulting’s Segway Olympics

Padstow Conservation Area Extension Approved

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

Grand Designs

Planning Committee Reforms in England What You Need to Know

A Contemporary Coastal Home by Laurence Associates

Architecture Vogue – Maen Valley

Agricultural Barn Development Advice

Appeal Success: Caravan Site Approved in Cornwall

Planning Permission Secured for Coastal Home Extension in Cornwall

Cornwall Council Housing Requirement – Laurence Associates

Laurence Associates – Royal Cornwall Show 2024

A Busy Week of Progress Across the Practice

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

Laurence Associates Returning to the Royal Cornwall Show 2026

New Project Showcase | A New Collection of Laurence Associates Projects

Laurence Associates Welcomes New Planning Director

Elmhurst Energy CPD

Planning Committee Success: Replacement Dwelling Approved

Replacement Dwelling Approved Following Class Q Success

Certificate of Lawfulness Secured for Residential Caravan Use

Porthcothan Site Update: Residential Planning Progress

Laurence Associates at Business Fest South West Westpoint

Tom Evans Promoted to Junior Planner

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Planning Permission Success for Access, Parking & Facilities

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Why Part T Is Changing Commercial Design More Than You Think

Laurence Associates at Stithians Show 2026

Planning Approval Secured for Multi-Generational Home in Feock

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

Committee Success Secures Permission in Principle for New Homes

CESW Summit 2026

Section 73 Approval for Revised Bungalow Scheme in St Erth

Current Vacancies – Senior Landscape Architect

Feock replacement dwelling project overview

Designing for Approval or Designing to Build?

Neighbourhood Plan Regulation Changes 2026

Regen Planning Conference

Laurence Associates at Groundsure Women in Property

From Sketch to Reality: Architectural Visualisation

Supporting the Interior Design Journey Through Architecture

Visit Laurence Associates at the Royal Cornwall Show 2026

Four Dwellings Approved Following Outline Consent

Architecture Vogue – Humble Cottage

Cornwall Council ‘Call For Sites’

A positive appeal decision for Laurence Associates

Construction Drawings Explained: What They Include and Why They Matter

East Allington Permission in Principle success for five new homes

Small Housing Schemes

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Considering a Home Extension?

Laurence Associates at Kernow Construction Club

Laurence Associates to Attend Business Fest

New premises & 30 Years in the business

James Vivian Promoted to Associate Director

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

Change of Use Approved: Takeaway to Residential in Cornwall

Certificates of Lawfulness Explained

Sensitive Dwelling Alterations Approved by Council

Architecture Vogue – Enys Hill

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Securing Five Unrestricted Homes in Mawgan Porth

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

Functional Living in a Contemporary Cornish Home

Restronguet Point – a room with a view

Redruth Housing Scheme Approved

Understanding the Design Brief Service at Laurence Associates

Barn Conversions Under Class Q and Class R

Design and Placemaking PPG out now

Team Attends Michelmore’s Property Development Club in Exeter

Successful Appeal Secured on Caravan Use and Building Definition

Securing Planning Permission – Community Hall Poundstock

Breaking Ground: New Project Progress

Seamless Single Storey Extensions That Complement Your Home

Planning Approved for 5 Unrestricted Rural Homes

Happy Easter from Laurence Associates

Laurence Associates Attending Ashfords Business Breakfast

Housing Land Supply Changes: What They Mean for Planning

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

Celebrating 20 Years of Leadership – Richard Marsden

Planning Approval for Sauna in Protected Landscape

Planning Approved for Farmhouse Extension on Bodmin Moor

A considered evolution of a familiar form

Planning Appeal Success to Building Regulations Approval

Cape Cornwall Club Redevelopment | Laurence Associates

Architecture Vogue – Greenbank Hotel

Summer in the City Networking Event | Laurence Associates Exeter

Outline Planning Consent Secured for Two New Dwellings

Planning Appeal Success for Equestrian Building

Blending Architecture into the Devon Countryside Through Materiality

Appeal Success Near St Ives

Construction Excellence Southwest Cornwall Summer Boat Trip

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Town Planner Vacancy – Planning Careers UK

How to Find a Building Plot

Grade II Listed Farmstead Planning Success

Housing Schemes in Cornwall That Truly Work for People

Why Do a Self Build?

Planning Appeal Success in Cornwall National Landscape

11 Bespoke Holiday Units Designed for Mawgan Porth

Securing Planning Permission – Greenbank Hotel Falmouth

Replacement Dwelling in lieu of Class Q

Laurence Associates Supports the Peloton Charity Golf Day 2026

Laurence Associates Attending Stithians Show 2026

Laurence Associates at Stithians Show 2026

Housing Land Supply Changes: What They Mean for Planning

How to Finance a Self-Build

Laurence Associates Welcomes New Design Director

Planning Permission Secured for Rural Replacement Dwelling

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Building Towards a Greener Future: Our Earth Day Commitment

Planning Permission Secured in Rock Cornwall

Cornish Replacement Dwelling Submitted for Building Regulations

Every Project Has More Than One Story to Tell

Architecture in Fowey | Laurence Associates

Where Design Meets Detail: The Role of Materials in Architecture

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Laurence Associates to Exhibit at Devon County Show 2026

Vickery Holman Market Review

Designing for Legacy, Lifestyle and Longevity

Visit Laurence Associates at the Devon County Show This Week

Construction Excellence Southwest Summit 2026

Traditional Barn Conversion Approved | Building Regulations Success

Ana Coelho promoted to Senior Chartered Architect

Coastal Home Design in Devon & Cornwall

3D Modelling an image speaks a thousand words

Unlocking Potential Through Replacement

Eco development on the sand dunes at Hayle

Building for Growth

Town Planner Job Vacancy in Truro | Laurence Associates

Laurence Associates at Groundsure Women in Property

Energy Statements: Why They Matter for Planning Applications

Sensitive Design Approach for Barn Conversion Window Proposal

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Conditional Planning Permission Secured for Five Homes in Bodmin

Laurence Associates Attending Townsend Landowner Seminar

Current Progress on Site in Falmouth

Building Safety Act | Building Regulations Principal Designer

Building Regulations Drawings: Why Detail Matters

National Planning Policy Framework

Farm Diversification Opportunities in the Southwest

Planning Success in Tintagel

Replacement Dwellings – Pushing the boundaries of Architecture

Building for Growth

Should I use an Architect?

Campsite Certificate and Replacement Dwelling Approval Cornwall

Work Experience Week: Exploring Architecture and Structural Engineering

Three Successful Planning Applications on One Site

Business Cornwall – March 2026

Planning Permission for Community Garden Redevelopment in Newquay

Laurence Associates attending Kernow Construction Club

A Collaborative Approach to Creating Meaningful Spaces

Penzance Business Breakfast

New National Planning Policy Framework Published | Laurence Associates

Welcome Igor Talbot to Laurence Associates | Graduate Planner

The Experts

Cornwall Building Regulations Update Event 2026

Laurence Associates at Groundsure Women in Property

Barn Conversion Approved West Cornwall

Rural Outbuilding Conversion Secures Planning Consent

Principal Designer Services | CDM 2015 Compliance

Community Sponsorship St Just RFC

From sketch to reality the power of visualisation in design development

Property Development Forum

Architecture Vogue – Smallridge Bros

Town Planner Job Vacancy in Truro | Laurence Associates

Residential Project Site Update | Progress on Site

International Women’s Day at Laurence Associates

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

Current Vacancies – Planner / Senior Planner

What is the Community Infrastructure Levy?

Outline Approval for Three New Homes in St Keyne

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Creating Seamless Indoor Outdoor Living Spaces

Laurence Associates Attends Cornwall Council Planning Agents Forum

Cornwall Local Plan Update 2028 and What It Means for Development

Coastal Cornish Home Design | Contemporary Architecture

Appeal Success – Removing Occupancy Condition

Laurence Associates prepares for Royal Cornwall Show 2026

The Built Environment Network – Trevelver Farm

Creating Flow and Connection Within the Home

RIBA Safe & Healthy Environments CPD Completed

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

Planning Consent Secured for Methane-Capture Facility

Meet the Laurence Associates Team at Devon County Show 2026

Final Days at the Devon County Show for Laurence Associates

Planning Permission Success for Barn Conversion

Grid Connection Reform and what it means for Renewable Energy Projects

Design Appraisals UK | Site Feasibility and Planning Assessments

Appeal Success for Agricultural Workers Dwelling Near Penzance

Master Planning That Creates Places for the Future

Why Do I Need a Professional Consultant’s Certificate?

Architecture Vogue – Eyebrid

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

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

Planning consent secured for replacement wind turbine

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

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

BNG Exemption for Small Development Sites

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

Consent Secured for Amendments to Housing Scheme in Gweek

Laurence Associates – Royal Cornwall Show 2025

Powering the Future: Repowering Wind Turbines Across the UK

Planning Appeal Success for Permission in Principle Scheme

Inside A Coastal Cornwall Residential Project

Contemporary Roof Extension in Cornwall | Sustainable Residential Design