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Abstract Multilateral technology has extended the production life of fields across the world for over three decades by delivering a higher recovery factor supported by the cumulative production of the multiple laterals. The lack of slots available to drill new wells challenges many operators to evaluate new well designs and technical solutions. Retrofit multilateral technology enables the addition of laterals in existing producing wells to reach additional reservoir targets. A retrofit multilateral can efficiently add reservoir contact at a lower baseline cost while keeping the original wellbore production. This paper discusses methods to provide a multilateral solution for drilling new lateral legs in existing wells. Compromised production targets and missed pay-zones can be reached through infill drilling, leveraging lessons learned from the conventional development campaign. The multilateral systems are stackable, enabling multiple new targets to be accessed through a single slot. Additionally, discussion will cover completion designs that tie new laterals into existing production casing. Case studies will include discussion of workover operations, isolation methods, and lateral creation systems. Using Multilateral Technology in existing wellbores increases available slots for sidetracks while maintaining, increasing, or even accelerating overall well production. The addition of low cost laterals allows operators to reach new targets closer to existing wells. Emissions and environmental impact are reduced through recycling mainbores, reducing rig time, and eliminating the use of carbon intense materials. The paper focuses on the challenges, solutions, and successful case studies of retrofit multilateral wells constructed in the North Sea and the Middle East. The paper also provides insight as to methodology for continually improving reliability of multilateral installations to maximize efficiencies.