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As an Architect, you will be required to prepare work estimates in form of job quotations for proposed projects. Your ability to predict or forecast real life site requirements from your drawing board will be tested.
Whether you fail or succeed has serious functional implications through the project timeline. Some contracts do not leave room for future amendments while some do. Whichever the case is, it is advisable to predict and provide for as much as possible afore time.

There is no hard or fast technique on preparing a quotation for a job. There are however a few well known techniques that work.
First is the traditional bill of quantities, featuring the tabular arrangement of work description, quantity, rates, and amounts. Commonly used by quantity surveyors. This method usually involves some pre-training in form of university education or work experience. It is the professional method of presenting job estimates.

Second is the semi formal letterheaded paper with the estimate handwritten or typewritten, signed and delivered to the client under seal. This method proves handy and easier for semi skilled and unskilled technicians who are called upon to do a special service in the site.
Below is an example of this type:

p.o.p skirtings
Sample: QUOTATION for proposed gate skirting.