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

Laurence Associates at Groundsure Women in Property

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

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

Section 73 Approval for Revised Bungalow Scheme in St Erth

Appeal Success Near St Ives

Feock replacement dwelling project overview

Current Progress on Site in Falmouth

Progress Update: Shaping a Bespoke Home

Construction Excellence Southwest Cornwall Summer Boat Trip

Planning Appeals Changes from April 2026

Securing Planning Permission – Greenbank Hotel Falmouth

Vickery Holman Market Review

Meet Will | Architectural Assistant at Laurence Associates

Architecture Vogue – Higher Harlyn

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

Understanding the Design Brief Service at Laurence Associates

Laurence Associates Welcomes New Design Director

Planning Approved for 5 Unrestricted Rural Homes

Laurence Associates to Exhibit at Devon County Show 2026

Navigating Building Regulations in Cornwall: A Design Led Approach

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Two Dwellings Approved in Roseland Peninsula National Landscape

Should I use an Architect?

New Bungalow Gains Building Regulations Approval

Rural Exception Scheme Approved in Perran Downs

Planning Permission Secured for Padstow Conservation Area Outbuildings

Polzeath Campsite Secures Year-Round Planning Permission

Successful Appeal Secured on Caravan Use and Building Definition

Architecture Vogue – Sand Dunes

Permission in Principle Success in St Austell

Property Development Forum

A Busy Week of Progress Across the Practice

Three Successful Planning Applications on One Site

Inside A Coastal Cornwall Residential Project

Laurence Associates – Royal Cornwall Show 2025

What is the Community Infrastructure Levy?

Change of Use Approved: Takeaway to Residential in Cornwall

Building for Growth

Current Vacancies – Town Planners

Building for Growth

From sketch to reality the power of visualisation in design development

Creating Seamless Indoor Outdoor Living Spaces

Porthcothan Site Update: Residential Planning Progress

How to Finance a Self-Build

Permission in Principle Secured for Six New Dwellings in Redruth

Architecture Vogue – Greenbank Hotel

Penzance Business Breakfast

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Padstow Conservation Area Extension Approved

A First Look at Our Latest Architectural Project

Four Dwellings Approved Following Outline Consent

Securing Five Unrestricted Homes in Mawgan Porth

Cornwall Local Plan Update 2028 and What It Means for Development

Sensitive Dwelling Alterations Approved by Council

Laurence Associates prepares for Royal Cornwall Show 2026

Seaside Sensation

Visit Laurence Associates at the Devon County Show This Week

Cornwall Council Housing Requirement – Laurence Associates

Why Do I Need a Professional Consultant’s Certificate?

Architecture Vogue – Smallridge Bros

Cornwall Building Regulations Update Event 2026

Traditional Barn Conversion Approved | Building Regulations Success

Construction (Design & Management) Regulations 2015 – March

Team Attends Michelmore’s Property Development Club in Exeter

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

New National Planning Policy Framework Published | Laurence Associates

Creating Flow and Connection Within the Home

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

International Women’s Day at Laurence Associates

Grade II Listed Farmstead Planning Success

Functional Living in a Contemporary Cornish Home

Rural Outbuilding Conversion Secures Planning Consent

Conversion in the Countryside: Securing Planning for a Rural Bothy

Construction Drawings Explained: What They Include and Why They Matter

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Cottage Renovation & Contemporary Extension in St Austell, Cornwall

New Project Collection Coming Soon

Laurence Associates Attending Stithians Show 2026

Visit Laurence Associates at the Royal Cornwall Show 2026

The Experts

Architecture Vogue – Enys Hill

Architecture Vogue – Humble Cottage

Section 106 Agreement Revoked Near Porthtowan

Rural Enterprise – Helping Rural Business Flourish

From Sketch to Reality: Architectural Visualisation

Planning Permission Secured for Rural Replacement Dwelling

Planning Committee Success: Replacement Dwelling Approved

Housing Land Supply Changes: What They Mean for Planning

Planning Permission Success for Barn Conversion

Eco development on the sand dunes at Hayle

Waterside Lookout

Design and Placemaking PPG out now

Powering the Future: Repowering Wind Turbines Across the UK

Laurence Associates Welcomes New Planning Director

Transforming historic barns into contemporary living and working spaces

Laurence Associates Attends Cornwall Council Planning Agents Forum

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

Ana Coelho promoted to Senior Chartered Architect

Cornwall Planning Constraints & NPPF Updates | Laurence Associates

Planning Approval Secured for Multi-Generational Home in Feock

Laurence Associates at SLR Consulting’s Segway Olympics

Planning Permission in a Conservation Area | Port Isaac

Laurence Associates Expands with New Office in Exeter

Elmhurst Energy CPD

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

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

RIBA Safe & Healthy Environments CPD Completed

Work Experience Week: Exploring Architecture and Structural Engineering

Planning Permission for Community Garden Redevelopment in Newquay

Laurence Associates at the CLA Southwest AGM

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

Planning Appeal Success to Building Regulations Approval

Laurence Associates at the CESW Cornwall Club Black Tie Ball

Laurence Associates at Stithians Show 2026

Certificates of Lawfulness Explained

Commercial Outdoor Kitchen Planning Permission

Planner Job Vacancy in Truro | Laurence Associates

3D Modelling an image speaks a thousand words

Laurence Associates at Groundsure Women in Property

Final Days at the Devon County Show for Laurence Associates

The Built Environment Network – Westcliff

Town Planner Job Vacancy in Truro | Laurence Associates

A Guide to Our Planning Application Process

Permission in Principle Secured for One Dwelling in Treleigh, Cornwall

Happy Easter from Laurence Associates

Affordable Housing Success

Self-Build and Custom Build Homes with Laurence Associates

Business Cornwall – March 2026

Architecture Vogue – Eyebrid

Unlocking Potential Through Replacement

New Project Showcase | A New Collection of Laurence Associates Projects

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

Agricultural Barn Development Advice

Planning consent secured for replacement wind turbine

Construction Excellence Southwest Summit 2026

Contemporary Home Renovation

Cornwall Council ‘Call For Sites’

Grid Connection Reform and what it means for Renewable Energy Projects

Boat House Building Regulations Approval in Feock | Laurence Associates

Visit Laurence Associates at the Royal Cornwall Show 2026

A Collaborative Approach to Creating Meaningful Spaces

Cape Cornwall Club Redevelopment | Laurence Associates

Town Planner Job Vacancy in Truro | Laurence Associates

A considered evolution of a familiar form

Design Appraisals UK | Site Feasibility and Planning Assessments

Planning Strategy & Residential Development | Laurence Associates

Laurence Associates Featured in Salt Magazine

Laurence Associates Mission

Architecture Vogue – Breakwater

Planner Job Vacancy in Truro | Laurence Associates

Every Project Has More Than One Story to Tell

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

A positive appeal decision for Laurence Associates

Neighbourhood Plan Regulation Changes 2026

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Building Regulations Approval for a Contemporary Home

CESW Summit 2026

Farm Diversification Opportunities in the Southwest

Where Design Meets Detail: The Role of Materials in Architecture

Passivhaus Design | Energy Efficient Homes in Cornwall & Devon

Summer in the City Networking Event | Laurence Associates Exeter

Laurence Associates at Groundsure Women in Property

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

Energy Statements: Why They Matter for Planning Applications

Small Housing Schemes

Meet the Laurence Associates Team at Devon County Show 2026

Laurence Associates attending Kernow Construction Club

Campsite Certificate and Replacement Dwelling Approval Cornwall

Laurence Associates Becomes a Certified B Corporation | Cornwall

How to Find a Building Plot

Laurence Associates Attending Ashfords Business Breakfast

Sensitive Design Approach for Barn Conversion Window Proposal

Laurence Associates Returning to the Royal Cornwall Show 2026

Barn Conversion Approved West Cornwall

Laurence Associates at Business Fest South West Westpoint

Home Renovation Progress Falmouth

Property Development Forum

Best of Houzz 2017 Design Award

Laurence Associates – Royal Cornwall Show 2024

Exploring Contemporary Materials and Colour in Cornish Architecture

Planning Approved for Farmhouse Extension on Bodmin Moor

Building Towards a Greener Future: Our Earth Day Commitment

Redruth Housing Scheme Approved

Housing Land Supply Changes: What They Mean for Planning

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Planning Consent Secured for Methane-Capture Facility

Designing Homes Shaped by Landscape and Views in Rural Cornwall

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

Why Part T Is Changing Commercial Design More Than You Think

Seamless Single Storey Extensions That Complement Your Home

Outline Planning Consent Secured for Two New Dwellings

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

Planning Success in Tintagel

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Replacement Dwelling in lieu of Class Q

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

Supporting the Interior Design Journey Through Architecture

Laurence Associates Attending Townsend Landowner Seminar

Designing for Legacy, Lifestyle and Longevity

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Laurence Associates Supports the Peloton Charity Golf Day 2026

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Building Regulations Drawings: Why Detail Matters

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

SEC1 Compliance & Energy-Efficient Homes in Cornwall

National Planning Policy Framework

Replacement Dwelling Approved Following Class Q Success

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

Replacement Dwellings – Pushing the boundaries of Architecture

Bespoke Architectural Design Process

Meet Ellen | Architect & Passivhaus Designer at Laurence Associates

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Laurence Associates Sponsors First Property Development Forum Event in Cornwall

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

Appeal Success: Caravan Site Approved in Cornwall

A Contemporary Coastal Home by Laurence Associates

Welcome Igor Talbot to Laurence Associates | Graduate Planner

New premises & 30 Years in the business

Considering a Home Extension?

Laurence Associates at Stithians Show 2026

Appeal Success for Agricultural Workers Dwelling Near Penzance

Housing Appeal Success in West Cornwall

Residential Project Site Update | Progress on Site

Architecture in Fowey | Laurence Associates

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

Town Planner Vacancy – Planning Careers UK

East Allington Permission in Principle success for five new homes

New Project Collection Coming Soon

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Laurence Associates at the Michelmores event in Exeter

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

The Built Environment Network – Trevelver Farm

Planning Consent for Commercial Change of Use in Bude

Planning Approval for Sauna in Protected Landscape

Planning Permission Secured for Coastal Home Extension in Cornwall

Housing Schemes in Cornwall That Truly Work for People

Laurence Associates to Attend Business Fest

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

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Outline Approval for Three New Homes in St Keyne

Committee Success Secures Permission in Principle for New Homes

Breaking Ground: New Project Progress

Restronguet Point – a room with a view

Tom Evans Promoted to Junior Planner

Energy Consultancy Services at Laurence Associates

Building Safety Act | Building Regulations Principal Designer

Architecture Vogue – Maen Valley

Consent Secured for Amendments to Housing Scheme in Gweek

Securing Planning Permission – Community Hall Poundstock

Planning Committee Reforms in England What You Need to Know

Designing for Approval or Designing to Build?

Non-Material Amendment Success

Natural Light

Conditional Planning Permission Secured for Five Homes in Bodmin

Blending Architecture into the Devon Countryside Through Materiality

BNG Exemption for Small Development Sites

Laurence Associates at Kernow Construction Club

Why Do a Self Build?

Current Vacancies – Planner / Senior Planner

Class Q Planning Permission

Meet Tait | Architectural Assistant at Laurence Associates

Planning Permission Secured in Rock Cornwall

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

James Vivian Promoted to Associate Director

Planning Appeal Success in Cornwall National Landscape

Planning Appeal Allowed Near Helston for 6 to 9 Dwellings

Current Vacancies – Senior Landscape Architect

Certificate of Lawfulness Secured for Residential Caravan Use

Coastal Cornish Home Design | Contemporary Architecture

Cornish Replacement Dwelling Submitted for Building Regulations

Planning Appeal Success for Permission in Principle Scheme

Grand Designs

Planning Permission Success for Access, Parking & Facilities

Barn Conversions Under Class Q and Class R

Attending Women in Business Breakfast at Truro Golf Club

YEP Exeter Padel Tournament

A Tailored Approach to Conceptual Design

Coastal Home Design in Devon & Cornwall

Appeal Success – Removing Occupancy Condition

Principal Designer Services | CDM 2015 Compliance

Celebrating 20 Years of Leadership – Richard Marsden

11 Bespoke Holiday Units Designed for Mawgan Porth

Community Sponsorship St Just RFC

Master Planning That Creates Places for the Future

Regen Planning Conference

Planning Appeal Success for Equestrian Building