Exceptional Engineering Expertise
Johns Slater and Haward are Chartered Building Services Consultants in Buildings, with roots dating back to 1850.
Engineering with experience and accountability.
Johns Slater and Haward are Chartered Building Services Consultants specialising in mechanical and electrical design across East Anglia and surrounding regions.
With heritage dating back over a century and practising as Johns Slater and Haward since 1949, we combine deep technical knowledge with a practical, director-led approach. Our team of over 40 professionals supports projects ranging from refurbishment of historic buildings to complex new healthcare and education developments.
Engineering support at every stage
OUR SERVICES
We provide mechanical and electrical consultancy across all stages of a project, from early feasibility and survey work through to detailed design, site monitoring and final certification.
Our work includes compliance modelling, BIM coordination, energy performance analysis and sustainability assessments, ensuring systems are carefully integrated and aligned with regulatory requirements.
WHO WE ARE
A practice built on trust and collaboration.
As a locally established practice with offices in Ipswich and Fordham, we value long-term professional relationships. Many of our projects come through repeat business and referrals.
Our approach is collaborative and transparent. We work closely with architects, contractors and client teams to ensure engineering solutions are fully integrated and practical to deliver.
Clients come to us for clarity; whether navigating complex compliance requirements, improving energy performance, planning for BREEAM certification or resolving technical uncertainty at feasibility stage.
PROJECTS
Our Projects
We have delivered mechanical and electrical design for projects of varying scale and complexity; from strategic infrastructure upgrades to large, multi-phase developments.
Our projects often involve detailed coordination within live environments, demanding programmes and stringent compliance requirements. We approach each project with the same level of technical rigour and senior oversight.
Our Values
We’ve built a reputation for delivering technically strong, sustainable, and effective building services engineering across a broad range of sectors, including healthcare, education, commercial, cultural and public buildings as well as domestic properties of various types and scale.
Many of our new projects come through word of mouth and repeat business, a testament to our quality and the strong relationships we maintain.
Technical Excellence
Sustainability & Responsibility
Collaborative Working
Accountability & Reliability
WORK WITH US
What sets us apart
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Every project is overseen by a Director who remains involved from initial feasibility through to completion. This consistent senior input provides clear accountability, informed decision-making and continuity throughout the project lifecycle.
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We work closely with our clients and design teams, developing long-term professional relationships built on trust and reliability. As an accessible and responsive practice, we aim to provide practical advice and clear communication at every stage.
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Each project presents its own technical and practical challenges. We develop engineering solutions that respond to the specific requirements of the brief and site conditions, focusing on designs that are achievable, coordinated and appropriate for the project.
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Our team brings extensive experience across a wide range of sectors, procurement routes and project stages. This breadth of knowledge allows us to provide well-informed guidance and robust engineering solutions, even on complex or technically demanding projects.
OUR LOCATION
Our Offices
We operate from Ipswich, Suffolk and Fordham, Cambridgeshire, supporting projects across East Anglia, London and further afield.
While regionally rooted, our director-led approach and technical standards remain consistent wherever we work.