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

Architecture Vogue – Greenbank Hotel

Architecture Vogue – Maen Valley

Construction Excellence Southwest Cornwall Summer Boat Trip

From Sketch to Reality: Architectural Visualisation

Meet Will | Architectural Assistant at Laurence Associates

Residential Project Site Update | Progress on Site

Cape Cornwall Club Redevelopment | Laurence Associates

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Every Project Has More Than One Story to Tell

Construction Drawings Explained: What They Include and Why They Matter

Coastal Cornish Home Design | Contemporary Architecture

Progress Update: Shaping a Bespoke Home

Outline Planning Consent Secured for Two New Dwellings

Laurence Associates Attending Stithians Show 2026

Building for Growth

Designing Homes Shaped by Landscape and Views in Rural Cornwall

3D Modelling an image speaks a thousand words

Change of Use Approved: Takeaway to Residential in Cornwall

Laurence Associates – Royal Cornwall Show 2024

Principal Designer Services | CDM 2015 Compliance

Planning Permission Secured for Coastal Home Extension in Cornwall

Architecture Vogue – Smallridge Bros

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

Waterside Lookout

Cornwall Planning Constraints & NPPF Updates | Laurence Associates

Laurence Associates at Groundsure Women in Property

Section 73 Approval for Revised Bungalow Scheme in St Erth

Architecture Vogue – Humble Cottage

Meet the Laurence Associates Team at Devon County Show 2026

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Laurence Associates at the CLA Southwest AGM

Penzance Business Breakfast

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

A Tailored Approach to Conceptual Design

Securing Five Unrestricted Homes in Mawgan Porth

Planning Permission Secured for Padstow Conservation Area Outbuildings

Architecture Vogue – Higher Harlyn

The Built Environment Network – Trevelver Farm

Summer in the City Networking Event | Laurence Associates Exeter

Appeal Success for Agricultural Workers Dwelling Near Penzance

Traditional Barn Conversion Approved | Building Regulations Success

Planning Appeals Changes from April 2026

Appeal Success: Caravan Site Approved in Cornwall

Restronguet Point – a room with a view

Tom Evans Promoted to Junior Planner

Replacement Dwelling in lieu of Class Q

Laurence Associates Becomes a Certified B Corporation | Cornwall

Community Sponsorship St Just RFC

Eco development on the sand dunes at Hayle

James Vivian Promoted to Associate Director

Powering the Future: Repowering Wind Turbines Across the UK

Visit Laurence Associates at the Royal Cornwall Show 2026

Non-Material Amendment Success

Small Housing Schemes

Polzeath Campsite Secures Year-Round Planning Permission

Cornish Replacement Dwelling Submitted for Building Regulations

Cottage Renovation & Contemporary Extension in St Austell, Cornwall

Cornwall Council Housing Requirement – Laurence Associates

Elmhurst Energy CPD

Current Vacancies – Planner / Senior Planner

Final Days at the Devon County Show for Laurence Associates

Best of Houzz 2017 Design Award

New National Planning Policy Framework Published | Laurence Associates

Affordable Housing Success

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Committee Success Secures Permission in Principle for New Homes

Functional Living in a Contemporary Cornish Home

Building Towards a Greener Future: Our Earth Day Commitment

From sketch to reality the power of visualisation in design development

Considering a Home Extension?

Creating Seamless Indoor Outdoor Living Spaces

Cornwall Local Plan Update 2028 and What It Means for Development

Laurence Associates prepares for Royal Cornwall Show 2026

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Building for Growth

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

Why Do I Need a Professional Consultant’s Certificate?

Campsite Certificate and Replacement Dwelling Approval Cornwall

East Allington Permission in Principle success for five new homes

Laurence Associates at Groundsure Women in Property

Town Planner Vacancy – Planning Careers UK

Laurence Associates Attending Ashfords Business Breakfast

Rural Outbuilding Conversion Secures Planning Consent

Visit Laurence Associates at the Royal Cornwall Show 2026

Current Vacancies – Town Planners

Sensitive Dwelling Alterations Approved by Council

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Laurence Associates Welcomes New Planning Director

Supporting the Interior Design Journey Through Architecture

Vickery Holman Market Review

International Women’s Day at Laurence Associates

Laurence Associates at Stithians Show 2026

Appeal Success – Removing Occupancy Condition

New Project Showcase | A New Collection of Laurence Associates Projects

Meet Ellen | Architect & Passivhaus Designer at Laurence Associates

RIBA Stage 4 Part 2: Taking Your Design from Approval to Construction

Ana Coelho promoted to Senior Chartered Architect

Planning Approval for Sauna in Protected Landscape

Construction (Design & Management) Regulations 2015 – March

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Work Experience Week: Exploring Architecture and Structural Engineering

Town Planner Job Vacancy in Truro | Laurence Associates

Laurence Associates at Groundsure Women in Property

Laurence Associates Supports the Peloton Charity Golf Day 2026

Cornwall Building Regulations Update Event 2026

Planning consent secured for replacement wind turbine

Laurence Associates to Attend Business Fest

National Planning Policy Framework

Why Part T Is Changing Commercial Design More Than You Think

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Permission in Principle Secured for Six New Dwellings in Redruth

Design and Placemaking PPG out now

Designing for Approval or Designing to Build?

Seaside Sensation

Certificate of Lawfulness Secured for Residential Caravan Use

Housing Land Supply Changes: What They Mean for Planning

Laurence Associates Attending Townsend Landowner Seminar

Planning Committee Success: Replacement Dwelling Approved

Laurence Associates Featured in Salt Magazine

Celebrating 20 Years of Leadership – Richard Marsden

Rural Exception Scheme Approved in Perran Downs

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Coastal Home Design in Devon & Cornwall

Master Planning That Creates Places for the Future

Planning Appeal Success for Permission in Principle Scheme

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

Laurence Associates Expands with New Office in Exeter

Farm Diversification Opportunities in the Southwest

Welcome Igor Talbot to Laurence Associates | Graduate Planner

Laurence Associates at SLR Consulting’s Segway Olympics

Planning Permission Secured for Rural Replacement Dwelling

Laurence Associates attending Kernow Construction Club

Designing for Legacy, Lifestyle and Longevity

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Laurence Associates Attends Cornwall Council Planning Agents Forum

Consent Secured for Amendments to Housing Scheme in Gweek

New premises & 30 Years in the business

Class Q Planning Permission

Appeal Success Near St Ives

What is the Community Infrastructure Levy?

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Planning Approved for Farmhouse Extension on Bodmin Moor

Blending Architecture into the Devon Countryside Through Materiality

Grand Designs

Laurence Associates Returning to the Royal Cornwall Show 2026

Property Development Forum

A positive appeal decision for Laurence Associates

A Collaborative Approach to Creating Meaningful Spaces

Planner Job Vacancy in Truro | Laurence Associates

A considered evolution of a familiar form

A Guide to Our Planning Application Process

Housing Land Supply Changes: What They Mean for Planning

Breaking Ground: New Project Progress

Work Experience Spotlight: Elsie’s Week at Laurence Associates

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

Cornwall Council ‘Call For Sites’

Visit Laurence Associates at the Devon County Show This Week

Three Successful Planning Applications on One Site

RIBA Safe & Healthy Environments CPD Completed

Planning Appeal Allowed Near Helston for 6 to 9 Dwellings

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Construction Excellence Southwest Summit 2026

Agricultural Barn Development Advice

Sensitive Design Approach for Barn Conversion Window Proposal

Laurence Associates – Royal Cornwall Show 2025

Current Vacancies – Senior Landscape Architect

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

Where Design Meets Detail: The Role of Materials in Architecture

Team Attends Michelmore’s Property Development Club in Exeter

Planning Committee Reforms in England What You Need to Know

Architecture in Fowey | Laurence Associates

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

How to Finance a Self-Build

Property Development Forum

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

Attending Women in Business Breakfast at Truro Golf Club

Section 106 Agreement Revoked Near Porthtowan

Navigating Building Regulations in Cornwall: A Design Led Approach

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

Laurence Associates at Stithians Show 2026

Planning Approval Secured for Multi-Generational Home in Feock

Housing Schemes in Cornwall That Truly Work for People

Barn Conversions Under Class Q and Class R

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

11 Bespoke Holiday Units Designed for Mawgan Porth

Town Planner Job Vacancy in Truro | Laurence Associates

Architecture Vogue – Sand Dunes

Planning Permission Secured in Rock Cornwall

Happy Easter from Laurence Associates

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Seamless Single Storey Extensions That Complement Your Home

Regen Planning Conference

Conditional Planning Permission Secured for Five Homes in Bodmin

Securing Planning Permission – Greenbank Hotel Falmouth

Inside A Coastal Cornwall Residential Project

Securing Planning Permission – Community Hall Poundstock

Planning Success in Tintagel

Exploring Contemporary Materials and Colour in Cornish Architecture

Building Regulations Drawings: Why Detail Matters

Porthcothan Site Update: Residential Planning Progress

Understanding the Design Brief Service at Laurence Associates

Redruth Housing Scheme Approved

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

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Conversion in the Countryside: Securing Planning for a Rural Bothy

Planning Appeal Success in Cornwall National Landscape

Should I use an Architect?

Contemporary Home Renovation

Replacement Dwellings – Pushing the boundaries of Architecture

Barn Conversion Approved West Cornwall

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

Padstow Conservation Area Extension Approved

CESW Summit 2026

Laurence Associates at Kernow Construction Club

Planning Permission for Community Garden Redevelopment in Newquay

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

Laurence Associates Welcomes New Design Director

Grid Connection Reform and what it means for Renewable Energy Projects

Rural Enterprise – Helping Rural Business Flourish

Unlocking Potential Through Replacement

Meet Tait | Architectural Assistant at Laurence Associates

Planning Permission Success for Access, Parking & Facilities

Design Appraisals UK | Site Feasibility and Planning Assessments

Feock replacement dwelling project overview

Creating Flow and Connection Within the Home

Replacement Dwelling Approved Following Class Q Success

Laurence Associates at Business Fest South West Westpoint

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

Planning Permission Success for Barn Conversion

How to Find a Building Plot

Laurence Associates to Exhibit at Devon County Show 2026

Business Cornwall – March 2026

Natural Light

Energy Consultancy Services at Laurence Associates

Building Safety Act | Building Regulations Principal Designer

Housing Appeal Success in West Cornwall

Energy Statements: Why They Matter for Planning Applications

Successful Appeal Secured on Caravan Use and Building Definition

Bespoke Architectural Design Process

The Built Environment Network – Westcliff

Architecture Vogue – Eyebrid

Current Progress on Site in Falmouth

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

Grade II Listed Farmstead Planning Success

The Experts

Planning Appeal Success for Equestrian Building

Self-Build and Custom Build Homes with Laurence Associates

Architecture Vogue – Breakwater

Home Renovation Progress Falmouth

New Project Collection Coming Soon

Planning Approved for 5 Unrestricted Rural Homes

Permission in Principle Success in St Austell

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

Laurence Associates at the CESW Cornwall Club Black Tie Ball

Why Do a Self Build?

Planning Appeal Success to Building Regulations Approval

A Busy Week of Progress Across the Practice

A Contemporary Coastal Home by Laurence Associates

Planning Consent Secured for Methane-Capture Facility

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

Certificates of Lawfulness Explained

BNG Exemption for Small Development Sites

Planning Strategy & Residential Development | Laurence Associates

Neighbourhood Plan Regulation Changes 2026

Outline Approval for Three New Homes in St Keyne

Architecture Vogue – Enys Hill

Four Dwellings Approved Following Outline Consent

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