About Us

McMullan & Co was founded by its principal, Sean McMullan, over 30 years ago. Sean’s background and experience in master planning and infrastructure development has led to the creation of a number of landmark developments: Malahide Marina (1989), Northwood, Santry (2002) and Tullynaskeagh County Down, a large-scale ground mounted solar PV development, (2014). These developments were the first of their type and scale in Ireland and consent was obtained without objections or local community planning appeals due to in-depth consultations with the relevant local authorities and communities.

Our basic philosophy and approach is to identify at the outset the factors which may be critical to a project’s implementation or feasibility and ensure that appropriately qualified expertise is employed. We ensure that concepts and ensuing designs are presented clearly and communicated effectively to all stakeholders. This approach has resulted in our successful delivery of many small to a large-scale high quality projects over a range of sectors.

Whether we are the sole consultant or working within a large project team, we maintain a strategic involvement in the overall design, planning and construction management to ensure that the projects are delivered to the desired quality on time and within budget.

Project management

• establishing brief and project objectives
• resourcing
• procurement
• programming
• stakeholder consultation
• site surveys
• contract administration
• construction management
• marketing and sales

Site identification and suitability

• site selection
• visual impact analysis
• assessment of existing & planned infrastructure
• planning assessment
• site acquisition


  • concept origination
  • design development
  • consultation with local/regulatory authorities
  • master planning
  • architectural design
  • fit out and interior design
  • structural and civil engineering design

Cost management

  • budget estimates
  • feasibility
  • cash flow projections
  • packaging and tendering
  • interim and final accounts

Statutory approvals and compliance

  • planning permission
  • appeals
  • BCAR – including role as design and/or assigned certifier
  • health and safety – including role as PSDP
  • DAC and fire certification

Project restructuring

  • Project reassessment
  • condition/snagging surveys
  • preparation of rectification and upgrade packages
  • managing works



Sean McMullan


Sean graduated as a civil engineer with an honours degree from Queens University, Belfast & gained further qualifications & a master’s degree from UCD. He is a chartered member of the Institute of Engineers Ireland.

M: +353 87 2538850

E: sean@mcmullanandco.ie

More info about Sean

Prior to founding McMullan & Co, he gained formative experience in project acquisition, sourcing and managing international consultants in the Middle East; this included regional planning and development, new town design, infrastructure development plus more specialised projects such as water and petroleum product pipelines and underground oil storage in the Middle East.

Sean has spent over thirty years successfully designing, managing and delivering projects. He is proficient in master planning, town planning, overall design, and cost estimating, financial appraisal and construction management. His particular expertise is in identifying the key factors which affect feasibility and implementation and ensuring that the appropriate expertise and resources are employed. He has a thorough knowledge of all aspects of projects and their individual and collective impact on their implementation and financial out turn.

Sean has also been involved in developing large-scale solar PV projects in Northern Ireland. His role includes site identification and selection, landowner negotiations and agreements, obtaining planning permission, submissions to DETINI in relation to the Renewables Obligation support mechanism plus related lobbying of NI Assembly members in addition to managing the project team.


Stephen O’Hanrahan

P3ABEng. BSc.(Hons)  MIEI

Stephen holds a 1st class honours degree in Civil Engineering.  He has over 12 years experience in the construction industry and has extensive experience in the design and management of both large scale and domestic projects.

M: + 353 87 3428790

E: stephen@mcmullanandco.ie

More info about Stephen

Stephen has worked on projects in the US, UK and Australia including: office fit-outs, residential developments/extensions, waste water treatment plants, desalination plants and urban regeneration projects among others.

Since joining McMullan & Co in 2013, Stephen has gained valuable design and project management experience in projects involving commercial and residential developments, building and site rectification works and alternative energy site identification and development.

Stephen plays a key role in the planning and building control process; tendering stage, construction scheduling, quality control throughout the construction stage and also the handing over of jobs upon completion. His main responsibility is to ensure projects comply with the new Building Control Amended Regulations 2014 in a cost effective manner.  He completes the process from Commencement Notice through to Completion Notice including the development of Preliminary Inspection Plans, Assigning Roles, and compilation of all applicable DOP certificates and finalising the Inspection Plan at completion stage. Stephen also has extensive knowledge of the renewable energy sector including wind and wave energy in addition to solar PV generation. He completed a thesis on Wave Energy Convertors and carried out extensive research on a model Oscillating Water Column.


Deirdre McMullan

P4ABSc.Arch. (Hons), Dip Arch, ARB.

Deirdre graduated from Queens University Belfast with an honours degree in Architecture in 2002 and completed her Diploma at the Mackintosh School of Architecture in Glasgow in 2005. Deirdre has over 10 years’ experience as an architect.

M:  +353 (0)87 4456340

E: deirdre@mcmullanandco.ie

More info about Deirdre

Deirdre has worked throughout Ireland on a wide variety of large scale commercial projects through all stages from feasibility and design development, to detail design, through to construction and handover. Her portfolio of work includes pharmaceutical, industrial manufacturing, higher education, offices, leisure and civic projects, with an emphasis on the redevelopment and refurbishment of existing facilities.

She has first-hand experience in the delivery of creative sustainable design, incorporating low carbon and energy efficient technologies, and places high value on quality architectural design. Deirdre adopts a team approach to all projects in which she is involved and establishes good working relationships with clients and construction teams.

Deirdre also has extensive  experience of working within multi-disciplinary teams, successfully co-ordinating construction projects and creating integrated solutions to complex briefs.  Deirdre is Revit trained to Level 2 BIM.


Deirdre Ryan


Deirdre holds primary degrees and post graduate diplomas from UCD and a Masters in Business Administration  from the University Of Ulster. She has extensive management experience in the private, public and non-profit sectors and across a range of functions.

M: +353 86 2374841

E: info@mcmullanandco.ie

More info about Deirdre

Appointed Director of the International Fund for Ireland (IFI) by the British & Irish Governments, her role involved project assessment and funding approval; setting strategic objectives; representation and media liaison and chairing the Audit Committee. She has held a number of board memberships in semi-state, private sector and cross border organisations.

As CEO she developed a small voluntary organization with limited resources to one of the leading organisations of its kind  in Ireland. In previous management roles in the private sector she managed finance, administration and HR in the largest privately owned liquid milk plant in Ireland and managed supply chains, finance, marketing and personnel in an importation and distribution company.

With McMullan & Co. Deirdre is responsible for financial management and project administration in addition to general business development. She manages finance, marketing and administration and her project development role involves project appraisal, establishing and negotiating financial requirements, budgeting and contract negotiation.