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

Planning Approved for Farmhouse Extension on Bodmin Moor

Contemporary Countryside Living: Reimagining Your Home in Cornwall

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

Barn Conversions Under Class Q and Class R

Laurence Associates prepares for Royal Cornwall Show 2026

Regen Planning Conference

Replacement Dwelling in lieu of Class Q

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

Blending Architecture into the Devon Countryside Through Materiality

Architecture Vogue – Smallridge Bros

Housing Appeal Success in West Cornwall

Conversion in the Countryside: Securing Planning for a Rural Bothy

Visit Laurence Associates at the Devon County Show This Week

From Sketch to Reality: Architectural Visualisation

Rural Enterprise – Helping Rural Business Flourish

From sketch to reality the power of visualisation in design development

Laurence Associates Supports the Peloton Charity Golf Day 2026

Small Housing Schemes

Rural Exception Scheme Approved in Perran Downs

Town Planner Job Vacancy in Truro | Laurence Associates

How to Find a Building Plot

BNG Exemption for Small Development Sites

Meet the Laurence Associates Team at Devon County Show 2026

Creating Seamless Indoor Outdoor Living Spaces

Coastal Cornish Home Design | Contemporary Architecture

Planning Permission Secured in Rock Cornwall

Supporting the Interior Design Journey Through Architecture

Planning Appeal Success to Building Regulations Approval

River Camel Nutrient Neutrality Update 2026: Bodmin Removed

YEP Exeter Padel Tournament

Appeal Success: Caravan Site Approved in Cornwall

Work Experience Week: Exploring Architecture and Structural Engineering

Laurence Associates attending Kernow Construction Club

Business Cornwall – March 2026

Laurence Associates Featured in Salt Magazine

The Built Environment Network – Westcliff

Laurence Associates Attending Ashfords Business Breakfast

Meet Ellen | Architect & Passivhaus Designer at Laurence Associates

Planning Strategy & Residential Development | Laurence Associates

Cornwall Building Regulations Update Event 2026

Architecture in Fowey | Laurence Associates

Sensitive Dwelling Alterations Approved by Council

Current Vacancies – Town Planners

Housing Land Supply Changes: What They Mean for Planning

Transforming historic barns into contemporary living and working spaces

Change of Use Approved: Takeaway to Residential in Cornwall

Town Planner Vacancy – Planning Careers UK

Laurence Associates at Groundsure Women in Property

Planning Consent Secured for Methane-Capture Facility

Campsite Certificate and Replacement Dwelling Approval Cornwall

Cornwall Local Plan Update 2028 and What It Means for Development

Meet Will | Architectural Assistant at Laurence Associates

Designing for Approval or Designing to Build?

Property Development Forum

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

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

Property Development Forum

Affordable Housing Success

Natural Light

Planning Permission Secured for Rural Replacement Dwelling

Construction (Design & Management) Regulations 2015 – March

Housing Schemes in Cornwall That Truly Work for People

A considered evolution of a familiar form

Building Safety Act | Building Regulations Principal Designer

Laurence Associates – Royal Cornwall Show 2025

Planning Appeals Changes from April 2026

Should I use an Architect?

Seamless Single Storey Extensions That Complement Your Home

Laurence Associates at Groundsure Women in Property

Current Vacancies – Planner / Senior Planner

Four Dwellings Approved Following Outline Consent

Breaking Ground: New Project Progress

New Project Showcase | A New Collection of Laurence Associates Projects

Securing Planning Permission – Community Hall Poundstock

Housing Land Supply Changes: What They Mean for Planning

Town Planner Job Vacancy in Truro | Laurence Associates

Building Towards a Greener Future: Our Earth Day Commitment

Two Dwellings Approved in Roseland Peninsula National Landscape

Cape Cornwall Club Redevelopment | Laurence Associates

Replacement Dwellings – Pushing the boundaries of Architecture

What is the Community Infrastructure Levy?

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

Grid Connection Reform and what it means for Renewable Energy Projects

Celebrating 20 Years of Leadership – Richard Marsden

Best of Houzz 2017 Design Award

Where Design Meets Detail: The Role of Materials in Architecture

Restronguet Point – a room with a view

A Collaborative Approach to Creating Meaningful Spaces

Planning consent secured for replacement wind turbine

Polzeath Campsite Secures Year-Round Planning Permission

Meet the Laurence Associates Team at Royal Cornwall Show 2026

Redruth Housing Scheme Approved

Committee Success Secures Permission in Principle for New Homes

Planning Committee Reforms in England What You Need to Know

Architecture Vogue – Enys Hill

Traditional Barn Conversion Approved | Building Regulations Success

Feock replacement dwelling project overview

Porthcothan Site Update: Residential Planning Progress

Grand Designs

Class Q Conversions: Unlocking the Potential of Agricultural Buildings

New Bungalow Gains Building Regulations Approval

Work Experience Spotlight: Elsie’s Week at Laurence Associates

Laurence Associates at the Michelmores event in Exeter

Contemporary Home Renovation

Visit Laurence Associates at the Royal Cornwall Show 2026

Consent Secured for Amendments to Housing Scheme in Gweek

Coastal Home Design in Devon & Cornwall

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

Progress Update: Shaping a Bespoke Home

Barn Conversion Approved West Cornwall

Passivhaus Design | Energy Efficient Homes in Cornwall & Devon

Building for Growth

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

Outline Planning Consent Secured for Two New Dwellings

Section 106 Agreement Revoked Near Porthtowan

Designing for Legacy, Lifestyle and Longevity

Permission in Principle Success in St Austell

Cornwall Planning Constraints & NPPF Updates | Laurence Associates

Laurence Associates at the CESW Cornwall Club Black Tie Ball

Grade II Listed Farmstead Planning Success

Planning Committee Success: Replacement Dwelling Approved

Replacement Dwelling Approved Following Class Q Success

New Project Collection Coming Soon

Ana Coelho promoted to Senior Chartered Architect

Laurence Associates to Attend Business Fest

Planning Appeal Success for Equestrian Building

Celebrating 20 Years of Creativity and Leadership with Jason Pledger

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

Cornwall Council ‘Call For Sites’

Laurence Associates Sponsors First Property Development Forum Event in Cornwall

Laurence Associates Attending Townsend Landowner Seminar

Neighbourhood Plan Regulation Changes 2026

Laurence Associates – Royal Cornwall Show 2024

National Planning Policy Framework

Agricultural Barn Development Advice

Contemporary Roof Extension in Cornwall | Sustainable Residential Design

Construction Drawings Explained: What They Include and Why They Matter

CESW Summit 2026

How to Finance a Self-Build

Appeal Success Near St Ives

Laurence Associates Attending Stithians Show 2026

Meet Tait | Architectural Assistant at Laurence Associates

Planner Job Vacancy in Truro | Laurence Associates

Outline Approval for Three New Homes in St Keyne

Three Successful Planning Applications on One Site

Laurence Associates at the CLA Southwest AGM

A First Look at Our Latest Architectural Project

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

New premises & 30 Years in the business

Architecture Vogue – Eyebrid

Adaptive Reuse Architecture | Blending Heritage with Modern Design

Appeal Success – Removing Occupancy Condition

Laurence Associates Expands with New Office in Exeter

Team Attends Michelmore’s Property Development Club in Exeter

East Allington Permission in Principle success for five new homes

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

Cottage Renovation & Contemporary Extension in St Austell, Cornwall

Laurence Associates Sponsors Rosudgeon and Kenneggy Cricket Club

Creating Flow and Connection Within the Home

Why Do a Self Build?

Laurence Associates at SLR Consulting’s Segway Olympics

Contemporary Countryside Living: Reimagining Your Home in Cornwall

Energy Consultancy Services at Laurence Associates

Certificate of Lawfulness Secured for Residential Caravan Use

Architecture Vogue – Sand Dunes

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

Seaside Sensation

A positive appeal decision for Laurence Associates

Unlocking Potential Through Replacement

Bespoke Architectural Design Process

Design Appraisals UK | Site Feasibility and Planning Assessments

Current Progress on Site in Falmouth

Self-Build and Custom Build Homes with Laurence Associates

Planning Success in Tintagel

Final Days at the Devon County Show for Laurence Associates

Laurence Associates at Kernow Construction Club

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

A Busy Week of Progress Across the Practice

Planning Permission Secured for Padstow Conservation Area Outbuildings

Padstow Conservation Area Extension Approved

New National Planning Policy Framework Published | Laurence Associates

Laurence Associates Welcomes New Design Director

Laurence Associates at Stithians Show 2026 Architecture and Planning Support

Construction Excellence Southwest Cornwall Summer Boat Trip

Permission in Principle Secured for One Dwelling in Treleigh, Cornwall

SEC1 Compliance & Energy-Efficient Homes in Cornwall

Laurence Associates at Groundsure Women in Property

Architecture Vogue – Maen Valley

The Built Environment Network – Trevelver Farm

Commercial Outdoor Kitchen Planning Permission

Navigating Building Regulations in Cornwall: A Design Led Approach

Planning Permission Success for Barn Conversion

Architecture Vogue – Higher Harlyn

Happy Easter from Laurence Associates

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Penzance Business Breakfast

Welcome Igor Talbot to Laurence Associates | Graduate Planner

Design and Placemaking PPG out now

Laurence Associates at Business Fest South West Westpoint

Planning Consent for Commercial Change of Use in Bude

Laurence Associates Welcomes New Planning Director

Laurence Associates to Exhibit at Devon County Show 2026

Home Renovation Progress Falmouth

Sensitive Design Approach for Barn Conversion Window Proposal

Considering a Home Extension?

Energy Statements: Why They Matter for Planning Applications

Construction Excellence Southwest Summit 2026

Community Sponsorship St Just RFC

James Vivian Promoted to Associate Director

Architecture Vogue – Humble Cottage

Successful Appeal Secured on Caravan Use and Building Definition

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

A Tailored Approach to Conceptual Design

Farm Diversification Opportunities in the Southwest

Laurence Associates at Stithians Show 2026

Securing Consent for 11 Bespoke Holiday Units in Mawgan Porth

A Contemporary Coastal Home by Laurence Associates

Vickery Holman Market Review

Rural Outbuilding Conversion Secures Planning Consent

Principal Designer Services | CDM 2015 Compliance

Class Q Planning Permission

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

Appeal Success for Agricultural Workers Dwelling Near Penzance

Laurence Associates Returning to the Royal Cornwall Show 2026

Attending Women in Business Breakfast at Truro Golf Club

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

Planning Approval Secured for Multi-Generational Home in Feock

Planning Permission in a Conservation Area | Port Isaac

Permission in Principle Secured for Six New Dwellings in Redruth

Understanding the Design Brief Service at Laurence Associates

Residential Project Site Update | Progress on Site

Planning Permission Secured for Coastal Home Extension in Cornwall

Exploring Contemporary Materials and Colour in Cornish Architecture

Powering the Future: Repowering Wind Turbines Across the UK

Master Planning That Creates Places for the Future

Meet Our Team | B Corp Values at Laurence Associates

Laurence Associates Becomes a Certified B Corporation | Cornwall

Functional Living in a Contemporary Cornish Home

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

Outline Planning Consent for Hotel and Restaurant Development in Cornwall

RIBA Safe & Healthy Environments CPD Completed

New Project Collection Coming Soon

Architecture Vogue – Greenbank Hotel

Planning Approved for 5 Unrestricted Rural Homes

Planning Appeal Success for Permission in Principle Scheme

Permission in Principle Secured for New Dwelling in Harrowbarrow

11 Bespoke Holiday Units Designed for Mawgan Porth

Securing Five Unrestricted Homes in Mawgan Porth

Summer in the City Networking Event | Laurence Associates Exeter

Designing Homes Shaped by Landscape and Views in Rural Cornwall

Architecture Vogue – Breakwater

Eco development on the sand dunes at Hayle

Conditional Planning Permission Secured for Five Homes in Bodmin

Planning Appeal Success in Cornwall National Landscape

Planning Permission Success for Access, Parking & Facilities

Current Vacancies – Senior Landscape Architect

Why Part T Is Changing Commercial Design More Than You Think

Non-Material Amendment Success

Elmhurst Energy CPD

Laurence Associates Mission

Architectural Technician Job in Truro Cornwall | Part 2 Architectural Assistant

Planning Approval for Sauna in Protected Landscape

Building Regulations Approval for a Contemporary Home

Inside A Coastal Cornwall Residential Project

The Experts

Building Regulations Drawings: Why Detail Matters

Why Involve Landscape Architects in Biodiversity Net Gain Proposals

Securing Planning Permission – Greenbank Hotel Falmouth

Planning Permission for Community Garden Redevelopment in Newquay

Cornwall Council Housing Requirement – Laurence Associates

Waterside Lookout

Certificates of Lawfulness Explained

Every Project Has More Than One Story to Tell

Laurence Associates at Stithians Show 2026

Visit Laurence Associates at the Royal Cornwall Show 2026

Laurence Associates Attends Cornwall Council Planning Agents Forum

Boat House Building Regulations Approval in Feock | Laurence Associates

Tom Evans Promoted to Junior Planner

Planner Job Vacancy in Truro | Laurence Associates

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

Planning Appeal Allowed Near Helston for 6 to 9 Dwellings

Cornish Replacement Dwelling Submitted for Building Regulations

3D Modelling an image speaks a thousand words

Why Do I Need a Professional Consultant’s Certificate?

International Women’s Day at Laurence Associates

Section 73 Approval for Revised Bungalow Scheme in St Erth

A Guide to Our Planning Application Process

Building for Growth