process FAQ

Traditional vs D&B or Cost plus?

We are seeing an increase in clients looking for different approaches to a traditional procurement in their projects, so we thought we would talk you through the main procurement options in the market at the moment and the advantages and disadvantages that you may experience.

Let’s start with TRADITIONAL PROCUREMENT

The client hires an architect to design the project and then complete a tender package to allow multiple contractors to price the proposed works.  On selection, the client enters into a separate contract with the contractor to that of the architect.

Disadvantages

  • Longer overall project duration due to sequential design and construction phases.

  • Increased potential for disputes between designers and contractors if there are variations to the scope.

  • Higher administrative burden for the client in managing multiple contracts and coordinating between designers and contractors if they self project manage.

Advantages

  • Greater control for the client over the design process as everything is designed ahead of a contractor pricing it.

  • Higher quality outcomes as clients can choose any architect and any contractor based on their previous projects.

  • Competitive tendering process allowing the client to understand market value.

 

Then there is DESIGN AND BUILD (D&B)

In a design and build procurement, a single entity is responsible for both the design and construction of a project.  The client typically signs a single contract with one firm which effectively streamlines the communication and decision making process.

Advantages

  • Single point of responsibility, reducing the potential for disputes between designers and contractors and streamlined project management in one place.

  • Faster project delivery due to concurrent design and construction phases.

  • Potential for cost savings as the contractor can optimise the design for constructibility and cost efficiency.

Disadvantages

  • Limited flexibility for the client in choosing separate designers and contractors.

  • Potential for conflicts of interest and cost increases if the selected company prioritises cost-cutting over quality or the expectation of quality is mismatched between client and contractor.

  • Clients may have less control over the design process compared to traditional procurement.

 

Finally, let’s look at COST PLUS PROCUREMENT

In this route, the architectural appointment remains separate in a traditional route, but the difference comes in the contracting as the client agrees to pay the contractor the actual costs of the building work and labour etc plus an additional fee (normally a percentage) to cover overheads and profit.

Disadvantages

  • Limited cost certainty for the client, as final project costs may exceed initial estimates.

  • Potential for conflicts of interest if the contractor has an incentive to increase costs in order to maximise their fee.

  • Requires a high level of trust between the client and contractor, as the client relies on the contractor's integrity in reporting costs accurately.

Advantages

  • High degree of transparency, as the client has full visibility into project costs and is only responsible for reimbursing actual expenses plus agreed fee.

  • Flexibility to accommodate changes and uncertainties during the project, as costs are not fixed.

  • Potential for cost savings if the contractor is able to complete the project under budget.

 

As you can see, the choice between Traditional Procurement, Design & Build and Cost Plus procurement depends on a number of factors such as project complexity and timelines, client preferences with regards to quality, budget constraints, and risk tolerances.

Each method has its own set of advantages and disadvantages, and the most suitable approach will vary depending on the specific circumstances of the project.

There are also other more bespoke offerings around, but they are mainly variations on the above three listed methods.

Managing Clients Expectations and Realisation Using Building Information Modelling

At MW Architects all of our drawings are produced using ArchiCAD; from initial design sketches to detailed construction packages. Following its launch in 1987, ArchiCAD was the first CAD product on a personal computer able to create both 2D and 3D geometry. Now in version 23 it has won BIM product of the year 9 times on the trot. We use the program to develop all of our designs in 3D, ensuring a higher level of accuracy and quality than is achievable with the use of 2D CAD alone.

ArchiCAD visualisation

The built-in ArchiCAD features allow our clients to examine our models either wholly or in custom segments. The resulting 2D output we produce therefore consists of the highest level of accuracy possible. Our approach, made possible with the use of ArchiCAD, allows us to tackle each project with the capacity to push the boundaries whilst keeping the process efficient. With the ability to see through the entire design process from concept to project realisation within the same 3D platform, our team avoids many of the costly and timely hiccups that occur when small alterations need to be implemented once projects are on-site.

MWArchitects ArchiCAD

ArchiCAD simulates physical building designs within one comprehensive 3D model that integrates information from all aspects of the design. Views, plans, sections and elevations are all created automatically and remain up to date with any alterations made to the building model on which they are based. Developing a design and producing output is a fast and efficient process using this method of working . We believe it is important to make full use of the latest technologies to not only help us design, but also to communicate our ideas as effectively as possible to clients, planners, and contractors.

MW Architects Archicad BIM

ArchiCAD provides the opportunity to use both real-time realistic visualisations and Virtual Reality. The use of these top end technologies allow us and clients to fully comprehend the look, feel and light quality of proposals, as well as compare different material finishes.

Our ability to export Virtual Reality enabled ArchiCAD models to BIMx, allows us to easily integrate Virtual Reality into our design process. MW Architects offer clients a complementary BIMx model that can be opened on smart phones and tablets, giving clients the opportunity to explore realistic 3D renditions of design proposals. This means they can effectively feed in to the process, whilst remaining fully informed of all developments. As well as clients, contractors also have the ability to utilise BIMx models. Not only can they be used to better understand projects, but also as a tool for communication during site meetings ArchiCAD has proven invaluable to us in all aspects of our work. With its use we feel confident in communicating our design intent, tackling challenges, and ensuring efficiency at all stages of a project. The scheduling tools help us to maintain coordinated information about sanitary ware, lighting, electrics, windows, doors, and windows, with little room for error or misunderstandings. Fully modelling and resolving our design proposals in 3D not only forces us to consider every single aspect and junction of a design, but also gives us the ability to produce high quality imagery paramount, for the successful and smooth running of every design project.

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How we developed an innovative roof construction method!

In 2014 we were given the exciting opportunity to design a replacement for a dilapidated, unused and unloved glass conservatory in East London. In this we saw the opportunity to experiment and develop an innovative timber roofing system. The result, a self reciprocating, double curved timber roof with a stressed skin. A unique roof was created unlike any in the surrounding area, floating above a beautiful space which is flooded with natural daylight everyday no matter the time of year. 

STEP 1 - 3D Modelling

After we had the idea for our new roofing system, we modelled it completely down to every nut and bolt on BIM. This allowed us to collaborate with structural engineers to ensure the rigidity of our proposed design. From our BIM model we were then able to extract each timber beam's outline for our test model. 

STEP 2 - Laser Cut Model

As our excitement increased about our idea becoming a reality we decided that we wanted to build a little version to keep in our office for ourselves. We produced a scaled laser cut model of the roofing structure - which not only looked cool but helped settle our nerves about it fitting together. Effectively we had designed a timber jigsaw on a building scale. 

"How we developed an innovative roof construction method" - Independent Place - MW Architects
"How we developed an innovative roof construction method" - Independent Place - MW Architects
"How we developed an innovative roof construction method" - Independent Place - MW Architects

STEP 3 - CNC Cutting

Physical model complete, it was now time for the real thing! After final structural checks, we exported our template for the timber beams and sent it over to Finland. We had decided that the best construction material would be Kerto-Q Structural LVL (Laminated Veneer Lumber) from Metsa Wood in Finland. The reason we decided on this was due to its exceptional structural performance. This super strength comes from its cross lamination, with each layer going in a different direction, meaning that when cut into curved beams the structural strength is in no way comprised. The below image shows how each sheet of LVL was cut using a CNC machine forming our individual pieces, with millimetre accuracy.  

It was then a waiting game for our timber to arrive in London! 

STEP 4 - Timber Arrives!

After a quick few weeks the wait was over and our oversized jigsaw pieces were in London! We began the trouble free, seamless operation of slotting ever piece together forming our double curved timber latice that served as the roofs 'structural bones'. Each element was bolted together, spreading the load across the entire roof, then down to the foundations through the steel support columns. Of course we had to go to site in order to see this process happen, we couldn't miss it! 

STEP 5 - Completion 

After the roof structure was assembled it was then lifted into to place, floating on thin steel columns and then made water tight with slithers of glass between the roof and the minimal side walls. The result, an innovative roof curving up graciously towards the sky. Not only an architectural showpiece in East London but also an engineering triumph. We were thrilled with our design but not as excited as the clients were to gain an extra room in their house. They were able to enjoy their garden all year round and fall back in love with their home. While great on the inside the unique extension also looks fantastic for passers by, especially once the sun has set and the building glows from within. 

"How we developed an innovative roof construction method" - Independent Place - MW Architects