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

Vickery Holman Market Review

Small Housing Schemes

A Collaborative Approach to Creating Meaningful Spaces

Energy Statements: Why They Matter for Planning Applications

Best of Houzz 2017 Design Award

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

Designing for Legacy, Lifestyle and Longevity

Architecture in Fowey | Laurence Associates

Exploring Contemporary Materials and Colour in Cornish Architecture

Cornwall Local Plan Update 2028 and What It Means for Development

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Grid Connection Reform and what it means for Renewable Energy Projects

Community Sponsorship St Just RFC

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

Visit Laurence Associates at the Devon County Show This Week

Construction (Design & Management) Regulations 2015 – March

Master Planning That Creates Places for the Future

Housing Land Supply Changes: What They Mean for Planning

Planning consent secured for replacement wind turbine

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

Laurence Associates Attending Townsend Landowner Seminar

Laurence Associates Mission

Planning Permission Secured for Padstow Conservation Area Outbuildings

Planning Permission Secured in Rock Cornwall

Breaking Ground: New Project Progress

Permission in Principle Secured for Six New Dwellings in Redruth

Agricultural Barn Development Advice

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

Rural Enterprise – Helping Rural Business Flourish

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Laurence Associates Supports the Peloton Charity Golf Day 2026

Conditional Planning Permission Secured for Five Homes in Bodmin

A considered evolution of a familiar form

Cornwall Planning Constraints & NPPF Updates | Laurence Associates

Section 73 Approval for Revised Bungalow Scheme in St Erth

Appeal Success: Caravan Site Approved in Cornwall

Building for Growth

Building Regulations Drawings: Why Detail Matters

Rural Exception Scheme Approved in Perran Downs

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

Grand Designs

11 Bespoke Holiday Units Designed for Mawgan Porth

Farm Diversification Opportunities in the Southwest

Meet Will | Architectural Assistant at Laurence Associates

Planning Appeals Changes from April 2026

Meet Tait | Architectural Assistant at Laurence Associates

Laurence Associates to Exhibit at Devon County Show 2026

Passivhaus Design | Energy Efficient Homes in Cornwall & Devon

The Experts

Campsite Certificate and Replacement Dwelling Approval Cornwall

Architecture Vogue – Higher Harlyn

Laurence Associates prepares for Royal Cornwall Show 2026

Planning Appeal Success to Building Regulations Approval

Construction Excellence Southwest Cornwall Summer Boat Trip

Planning Strategy & Residential Development | Laurence Associates

Current Vacancies – Town Planners

Functional Living in a Contemporary Cornish Home

Laurence Associates Expands with New Office in Exeter

New Project Collection Coming Soon

East Allington Permission in Principle success for five new homes

CESW Summit 2026

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

Celebrating 20 Years of Leadership – Richard Marsden

Property Development Forum

Adaptive Reuse Architecture | Blending Heritage with Modern Design

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

Why Part T Is Changing Commercial Design More Than You Think

Consent Secured for Amendments to Housing Scheme in Gweek

Planning Approved for Farmhouse Extension on Bodmin Moor

Laurence Associates Attending Ashfords Business Breakfast

Laurence Associates Sponsors First Property Development Forum Event in Cornwall

Permission in Principle Success in St Austell

Securing Five Unrestricted Homes in Mawgan Porth

New National Planning Policy Framework Published | Laurence Associates

Every Project Has More Than One Story to Tell

Planning Committee Reforms in England What You Need to Know

Final Days at the Devon County Show for Laurence Associates

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

New Project Collection Coming Soon

Securing Planning Permission – Greenbank Hotel Falmouth

Ana Coelho promoted to Senior Chartered Architect

Housing Land Supply Changes: What They Mean for Planning

Current Progress on Site in Falmouth

Three Successful Planning Applications on One Site

Change of Use Approved: Takeaway to Residential in Cornwall

Section 106 Agreement Revoked Near Porthtowan

Committee Success Secures Permission in Principle for New Homes

A Contemporary Coastal Home by Laurence Associates

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

Building Regulations Approval for Storage Unit in Bodmin

Welcome Igor Talbot to Laurence Associates | Graduate Planner

Considering a Home Extension?

National Planning Policy Framework

Laurence Associates Featured in Salt Magazine

Unlocking Potential Through Replacement

Current Vacancies – Planner / Senior Planner

Sensitive Design Approach for Barn Conversion Window Proposal

Certificates of Lawfulness Explained

Planning Committee Success: Replacement Dwelling Approved

Seaside Sensation

Residential Project Site Update | Progress on Site

Contemporary Home Renovation

Laurence Associates to Attend Business Fest

YEP Exeter Padel Tournament

Planning Permission Success for Barn Conversion

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

Polzeath Campsite Secures Year-Round Planning Permission

Outline Approval for Three New Homes in St Keyne

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Laurence Associates at Groundsure Women in Property

A positive appeal decision for Laurence Associates

Coastal Cornish Home Design | Contemporary Architecture

Seamless Single Storey Extensions That Complement Your Home

Why Do a Self Build?

Cornwall Council ‘Call For Sites’

Laurence Associates Becomes a Certified B Corporation | Cornwall

Should I use an Architect?

Securing Planning Permission – Community Hall Poundstock

Replacement Dwelling Approved Following Class Q Success

Appeal Success for Agricultural Workers Dwelling Near Penzance

Certificate of Lawfulness Secured for Residential Caravan Use

Building Regulations Approval for a Contemporary Home

Permission in Principle Secured for One Dwelling in Treleigh, Cornwall

Laurence Associates Welcomes New Design Director

Laurence Associates – Royal Cornwall Show 2025

Why Do I Need a Professional Consultant’s Certificate?

Planning Appeal Success in Cornwall National Landscape

From Sketch to Reality: Architectural Visualisation

Architecture Vogue – Greenbank Hotel

Appeal Success – Removing Occupancy Condition

A Busy Week of Progress Across the Practice

Cornwall Council Housing Requirement – Laurence Associates

How to Find a Building Plot

Bespoke Architectural Design Process

Redruth Housing Scheme Approved

Rural Outbuilding Conversion Secures Planning Consent

Regen Planning Conference

Padstow Conservation Area Extension Approved

Cottage Renovation & Contemporary Extension in St Austell, Cornwall

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Town Planner Vacancy – Planning Careers UK

Cornwall Building Regulations Update Event 2026

Principal Designer Services | CDM 2015 Compliance

New Project Showcase | A New Collection of Laurence Associates Projects

Grade II Listed Farmstead Planning Success

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

Housing Appeal Success in West Cornwall

Visit Laurence Associates at the Royal Cornwall Show 2026

Planning Consent Secured for Methane-Capture Facility

Supporting the Interior Design Journey Through Architecture

A First Look at Our Latest Architectural Project

Team Attends Michelmore’s Property Development Club in Exeter

Barn Conversions Under Class Q and Class R

Work Experience Week: Exploring Architecture and Structural Engineering

New Bungalow Gains Building Regulations Approval

Future Homes Standard 2027: Guide for Homeowners & Developers

Outline Planning Consent Secured for Two New Dwellings

Design and Placemaking PPG out now

3D Modelling an image speaks a thousand words

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Penzance Business Breakfast

RIBA Safe & Healthy Environments CPD Completed

BNG Exemption for Small Development Sites

Barn Conversion Approved West Cornwall

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

The Built Environment Network – Westcliff

Progress Update: Shaping a Bespoke Home

Class Q Planning Permission

Planning Permission Success for Access, Parking & Facilities

Sensitive Dwelling Alterations Approved by Council

Laurence Associates at the CESW Cornwall Club Black Tie Ball

Replacement Dwellings – Pushing the boundaries of Architecture

Laurence Associates Returning to the Royal Cornwall Show 2026

Laurence Associates at the CLA Southwest AGM

Summer in the City Networking Event | Laurence Associates Exeter

Architecture Vogue – Eyebrid

Understanding the Design Brief Service at Laurence Associates

Building for Growth

Designing Homes Shaped by Landscape and Views in Rural Cornwall

Commercial Outdoor Kitchen Planning Permission

Planning Permission Secured for Rural Replacement Dwelling

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

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

Energy Consultancy Services at Laurence Associates

Laurence Associates at Business Fest South West Westpoint

Designing for Approval or Designing to Build?

Coastal Home Design in Devon & Cornwall

Laurence Associates attending Kernow Construction Club

Property Development Forum Cornwall

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

Laurence Associates at Groundsure Women in Property

Non-Material Amendment Success

Planning Success in Tintagel

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

Meet Our Team | B Corp Values at Laurence Associates

Transforming historic barns into contemporary living and working spaces

Building Towards a Greener Future: Our Earth Day Commitment

Permission in Principle Secured for New Dwelling in Harrowbarrow

Laurence Associates at SLR Consulting’s Segway Olympics

Conversion in the Countryside: Securing Planning for a Rural Bothy

International Women’s Day at Laurence Associates

Planning Approval for Sauna in Protected Landscape

Planning Appeal Success for Permission in Principle Scheme

Feock replacement dwelling project overview

How to Finance a Self-Build

Waterside Lookout

Town Planner Job Vacancy in Truro | Laurence Associates

Laurence Associates at Stithians Show 2026

Business Cornwall – March 2026

Building Safety Act | Building Regulations Principal Designer

Visit Laurence Associates at the Royal Cornwall Show 2026

Property Development Forum

Design Appraisals UK | Site Feasibility and Planning Assessments

Architecture Vogue – Maen Valley

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Architecture Vogue – Smallridge Bros

Traditional Barn Conversion Approved | Building Regulations Success

A Tailored Approach to Conceptual Design

Planning Permission for Community Garden Redevelopment in Newquay

Porthcothan Site Update: Residential Planning Progress

Planning Appeal Allowed Near Helston for 6 to 9 Dwellings

Self-Build and Custom Build Homes with Laurence Associates

Inside A Coastal Cornwall Residential Project

Planning Approved for 5 Unrestricted Rural Homes

Town Planner Job Vacancy in Truro | Laurence Associates

Appeal Success Near St Ives

Two Dwellings Approved in Roseland Peninsula National Landscape

Architecture Vogue – Enys Hill

Cornish Replacement Dwelling Submitted for Building Regulations

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

Navigating Building Regulations in Cornwall: A Design Led Approach

Architecture Vogue – Sand Dunes

Four Dwellings Approved Following Outline Consent

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Natural Light

Laurence Associates at Groundsure Women in Property

Planning Approval Secured for Multi-Generational Home in Feock

Meet the Laurence Associates Team at Devon County Show 2026

Laurence Associates at Stithians Show 2026

Housing Schemes in Cornwall That Truly Work for People

Powering the Future: Repowering Wind Turbines Across the UK

Attending Women in Business Breakfast at Truro Golf Club

Planning Consent for Commercial Change of Use in Bude

Construction Drawings Explained: What They Include and Why They Matter

Planning Appeal Success for Equestrian Building

Planning Permission in a Conservation Area | Port Isaac

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

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Elmhurst Energy CPD

Creating Flow and Connection Within the Home

Planner Job Vacancy in Truro | Laurence Associates

Laurence Associates Welcomes New Planning Director

Neighbourhood Plan Regulation Changes 2026

Restronguet Point – a room with a view

Where Design Meets Detail: The Role of Materials in Architecture

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Replacement Dwelling in lieu of Class Q

Cape Cornwall Club Redevelopment | Laurence Associates

Boat House Building Regulations Approval in Feock | Laurence Associates

Affordable Housing Success

The Built Environment Network – Trevelver Farm

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Tom Evans Promoted to Junior Planner

Laurence Associates at Kernow Construction Club

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

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

A Guide to Our Planning Application Process

Successful Appeal Secured on Caravan Use and Building Definition

Architecture Vogue – Breakwater

What is the Community Infrastructure Levy?

Current Vacancies – Senior Landscape Architect

Laurence Associates at the Michelmores event in Exeter

Planner Job Vacancy in Truro | Laurence Associates

New premises & 30 Years in the business

Laurence Associates – Royal Cornwall Show 2024

Happy Easter from Laurence Associates

Construction Excellence Southwest Summit 2026

Home Renovation Progress Falmouth

From sketch to reality the power of visualisation in design development

Laurence Associates Attending Stithians Show 2026

Laurence Associates Attends Cornwall Council Planning Agents Forum

Planning Permission Secured for Coastal Home Extension in Cornwall

James Vivian Promoted to Associate Director

Creating Seamless Indoor Outdoor Living Spaces

Blending Architecture into the Devon Countryside Through Materiality

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

Architecture Vogue – Humble Cottage

Eco development on the sand dunes at Hayle

Meet Ellen | Architect & Passivhaus Designer at Laurence Associates