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

Bespoke Architectural Design Process

Housing Schemes in Cornwall That Truly Work for People

Seamless Single Storey Extensions That Complement Your Home

Rural Enterprise – Helping Rural Business Flourish

Laurence Associates at Kernow Construction Club

Inside A Coastal Cornwall Residential Project

A Contemporary Coastal Home by Laurence Associates

Business Cornwall – March 2026

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

Property Development Forum

Laurence Associates at Stithians Show 2026

Considering a Home Extension?

Four Dwellings Approved Following Outline Consent

Class Q Planning Permission

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

Designing for Legacy, Lifestyle and Longevity

Laurence Associates Expands with New Office in Exeter

Planning Approval for Sauna in Protected Landscape

Attending Women in Business Breakfast at Truro Golf Club

Planning Permission Success for Barn Conversion

Community Sponsorship St Just RFC

Tom Evans Promoted to Junior Planner

Planning Committee Reforms in England What You Need to Know

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

Certificate of Lawfulness Secured for Residential Caravan Use

Creating Seamless Indoor Outdoor Living Spaces

Housing Appeal Success in West Cornwall

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

Rural Exception Scheme Approved in Perran Downs

Understanding the Design Brief Service at Laurence Associates

Current Progress on Site in Falmouth

Replacement Dwellings – Pushing the boundaries of Architecture

Ana Coelho promoted to Senior Chartered Architect

Current Vacancies – Town Planners

Planning Approval Secured for Multi-Generational Home in Feock

Energy Consultancy Services at Laurence Associates

Design and Placemaking PPG out now

Outline Planning Consent Secured for Two New Dwellings

Planning Permission Secured for Rural Replacement Dwelling

Exploring Contemporary Materials and Colour in Cornish Architecture

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

Outline Approval for Three New Homes in St Keyne

Why Do a Self Build?

Architecture Vogue – Maen Valley

Laurence Associates at Groundsure Women in Property

Padstow Conservation Area Extension Approved

Laurence Associates Welcomes New Planning Director

Residential Project Site Update | Progress on Site

A Guide to Our Planning Application Process

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Meet the Laurence Associates Team at Devon County Show 2026

Appeal Success – Removing Occupancy Condition

Replacement Dwelling in lieu of Class Q

Self-Build and Custom Build Homes with Laurence Associates

Energy Statements: Why They Matter for Planning Applications

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

A positive appeal decision for Laurence Associates

Laurence Associates to Attend Business Fest

Designing for Approval or Designing to Build?

New National Planning Policy Framework Published | Laurence Associates

Visit Laurence Associates at the Royal Cornwall Show 2026

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Laurence Associates – Royal Cornwall Show 2025

Town Planner Job Vacancy in Truro | Laurence Associates

Laurence Associates Supports the Peloton Charity Golf Day 2026

Laurence Associates at Business Fest South West Westpoint

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

Visit Laurence Associates at the Devon County Show This Week

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

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

Farm Diversification Opportunities in the Southwest

Building Safety Act | Building Regulations Principal Designer

Architecture Vogue – Breakwater

Affordable Housing Success

Penzance Business Breakfast

The Experts

Architecture Vogue – Greenbank Hotel

Planning Success in Tintagel

Porthcothan Site Update: Residential Planning Progress

Blending Architecture into the Devon Countryside Through Materiality

What is the Community Infrastructure Levy?

Construction Drawings Explained: What They Include and Why They Matter

Cape Cornwall Club Redevelopment | Laurence Associates

New Project Showcase | A New Collection of Laurence Associates Projects

Supporting the Interior Design Journey Through Architecture

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

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

Planning Appeal Success to Building Regulations Approval

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

Permission in Principle Success in St Austell

Laurence Associates prepares for Royal Cornwall Show 2026

Planning Approved for 5 Unrestricted Rural Homes

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

Planning Consent Secured for Methane-Capture Facility

Town Planner Job Vacancy in Truro | Laurence Associates

National Planning Policy Framework

Breaking Ground: New Project Progress

Section 73 Approval for Revised Bungalow Scheme in St Erth

Construction Excellence Southwest Cornwall Summer Boat Trip

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Natural Light

Current Vacancies – Planner / Senior Planner

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Grade II Listed Farmstead Planning Success

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

Conversion in the Countryside: Securing Planning for a Rural Bothy

Cornwall Local Plan Update 2028 and What It Means for Development

Laurence Associates attending Kernow Construction Club

Navigating Building Regulations in Cornwall: A Design Led Approach

Architecture Vogue – Smallridge Bros

A Tailored Approach to Conceptual Design

Three Successful Planning Applications on One Site

Coastal Home Design in Devon & Cornwall

Building for Growth

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Housing Land Supply Changes: What They Mean for Planning

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

Architecture Vogue – Sand Dunes

Seaside Sensation

New premises & 30 Years in the business

Restronguet Point – a room with a view

Consent Secured for Amendments to Housing Scheme in Gweek

Unlocking Potential Through Replacement

Creating Flow and Connection Within the Home

From sketch to reality the power of visualisation in design development

Permission in Principle Secured for Six New Dwellings in Redruth

Traditional Barn Conversion Approved | Building Regulations Success

Laurence Associates Featured in Salt Magazine

Town Planner Vacancy – Planning Careers UK

Vickery Holman Market Review

Neighbourhood Plan Regulation Changes 2026

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

Welcome Igor Talbot to Laurence Associates | Graduate Planner

A considered evolution of a familiar form

Architecture Vogue – Eyebrid

RIBA Safe & Healthy Environments CPD Completed

Architecture in Fowey | Laurence Associates

Eco development on the sand dunes at Hayle

Securing Planning Permission – Greenbank Hotel Falmouth

Cornwall Building Regulations Update Event 2026

How to Find a Building Plot

International Women’s Day at Laurence Associates

Architecture Vogue – Enys Hill

Campsite Certificate and Replacement Dwelling Approval Cornwall

Planning Appeal Success for Permission in Principle Scheme

A Collaborative Approach to Creating Meaningful Spaces

Small Housing Schemes

Master Planning That Creates Places for the Future

Securing Five Unrestricted Homes in Mawgan Porth

Securing Planning Permission – Community Hall Poundstock

Laurence Associates Attending Ashfords Business Breakfast

Cornwall Council ‘Call For Sites’

Laurence Associates at Groundsure Women in Property

Planning consent secured for replacement wind turbine

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Feock replacement dwelling project overview

Planning Appeal Success for Equestrian Building

Certificates of Lawfulness Explained

Appeal Success: Caravan Site Approved in Cornwall

Home Renovation Progress Falmouth

Conditional Planning Permission Secured for Five Homes in Bodmin

Cornish Replacement Dwelling Submitted for Building Regulations

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

From Sketch to Reality: Architectural Visualisation

Planning Approved for Farmhouse Extension on Bodmin Moor

Happy Easter from Laurence Associates

Waterside Lookout

Team Attends Michelmore’s Property Development Club in Exeter

Housing Land Supply Changes: What They Mean for Planning

Committee Success Secures Permission in Principle for New Homes

Sensitive Dwelling Alterations Approved by Council

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

3D Modelling an image speaks a thousand words

Laurence Associates – Royal Cornwall Show 2024

Grand Designs

Construction (Design & Management) Regulations 2015 – March

Laurence Associates at Stithians Show 2026

East Allington Permission in Principle success for five new homes

Progress Update: Shaping a Bespoke Home

Laurence Associates Welcomes New Design Director

BNG Exemption for Small Development Sites

Best of Houzz 2017 Design Award

Planning Permission for Community Garden Redevelopment in Newquay

Why Part T Is Changing Commercial Design More Than You Think

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

Planning Permission Secured for Padstow Conservation Area Outbuildings

SEC1 Compliance & Energy-Efficient Homes in Cornwall

The Built Environment Network – Trevelver Farm

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Architecture Vogue – Humble Cottage

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

Building for Growth

Visit Laurence Associates at the Royal Cornwall Show 2026

Redruth Housing Scheme Approved

Why Do I Need a Professional Consultant’s Certificate?

Powering the Future: Repowering Wind Turbines Across the UK

Planning Committee Success: Replacement Dwelling Approved

Functional Living in a Contemporary Cornish Home

Planning Permission Secured for Coastal Home Extension in Cornwall

Laurence Associates at the CLA Southwest AGM

Grid Connection Reform and what it means for Renewable Energy Projects

How to Finance a Self-Build

Building Regulations Drawings: Why Detail Matters

Laurence Associates to Exhibit at Devon County Show 2026

Successful Appeal Secured on Caravan Use and Building Definition

Final Days at the Devon County Show for Laurence Associates

Every Project Has More Than One Story to Tell

Barn Conversions Under Class Q and Class R

Current Vacancies – Senior Landscape Architect

Planning Appeals Changes from April 2026

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

Principal Designer Services | CDM 2015 Compliance

Replacement Dwelling Approved Following Class Q Success

Non-Material Amendment Success

CESW Summit 2026

Change of Use Approved: Takeaway to Residential in Cornwall

Where Design Meets Detail: The Role of Materials in Architecture

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Barn Conversion Approved West Cornwall

Regen Planning Conference

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

Designing Homes Shaped by Landscape and Views in Rural Cornwall

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

Laurence Associates at Groundsure Women in Property

Laurence Associates Attending Townsend Landowner Seminar

Celebrating 20 Years of Leadership – Richard Marsden

Laurence Associates at SLR Consulting’s Segway Olympics

Planning Permission Success for Access, Parking & Facilities

A Busy Week of Progress Across the Practice

Appeal Success for Agricultural Workers Dwelling Near Penzance

Rural Outbuilding Conversion Secures Planning Consent

Coastal Cornish Home Design | Contemporary Architecture

Design Appraisals UK | Site Feasibility and Planning Assessments

New Project Collection Coming Soon

Laurence Associates Attending Stithians Show 2026

Construction Excellence Southwest Summit 2026

Building Towards a Greener Future: Our Earth Day Commitment

Planning Permission Secured in Rock Cornwall

Should I use an Architect?

Appeal Success Near St Ives

Elmhurst Energy CPD

Property Development Forum

Planning Appeal Success in Cornwall National Landscape

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Laurence Associates Returning to the Royal Cornwall Show 2026

James Vivian Promoted to Associate Director

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Architecture Vogue – Higher Harlyn

Laurence Associates Attends Cornwall Council Planning Agents Forum

11 Bespoke Holiday Units Designed for Mawgan Porth

Summer in the City Networking Event | Laurence Associates Exeter

Agricultural Barn Development Advice

Work Experience Week: Exploring Architecture and Structural Engineering

Sensitive Design Approach for Barn Conversion Window Proposal

Cornwall Council Housing Requirement – Laurence Associates